openstack/charm-deployment-guide
Code Issues Proposed changes

Remove upgrade pages

Browse Source 
Remove the upgrade pages as they are being migrated to
the charm-guide.

Add HTML redirects (and tests) for the more important
pages.

Depends-On: I31ecf2b885d808802fc83a0a8414032764b20e1d
Change-Id: I446a5849cee97351e21ce2435cede2a742d3a9e0
This commit is contained in:
Peter Matulis 2022-08-15 18:01:08 -04:00
parent 735f9d2e81
commit f6da73921e
13 changed files with 15 additions and 3230 deletions
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5
deploy-guide/source/_extra/.htaccess
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@ -44,3 +44,8 @@ RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/percona-
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/charmhub-migration.html$ /charm-guide/$1/project/procedures/charmhub-migration.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/ovn-migration.html$ /charm-guide/$1/project/procedures/ovn-migration.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-special.html$ /charm-guide/$1/project/issues-and-procedures.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-charms.html$ /charm-guide/$1/admin/upgrades/charms.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-series.html$ /charm-guide/$1/admin/upgrades/series.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-series-openstack.html$ /charm-guide/$1/admin/upgrades/series-openstack.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-openstack.html$ /charm-guide/$1/admin/upgrades/openstack.html
RedirectMatch 301 ^/project-deploy-guide/charm-deployment-guide/([^/]+)/upgrade-overview.html$ /charm-guide/$1/admin/upgrades/overview.html

5
deploy-guide/source/configure-openstack.rst
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@ -403,11 +403,12 @@ You now have a functional OpenStack cloud managed by MAAS-backed Juju.
* The entire suite of charms used to manage the cloud should be upgraded to
the latest stable charm revision before any major change is made to the
cloud (e.g. migrating to new charms, upgrading cloud services, upgrading
machine series). See :doc:`Charms upgrade <upgrade-charms>` for details.
machine series). See :doc:`cg:admin/upgrades/charms` in the Charm Guide
for details.
* The Juju machines that comprise the cloud should all be running the same
series (e.g. 'focal' or 'jammy', but not a mix of the two). See
:doc:`Series upgrade <upgrade-series>` for details.
:doc:`cg:admin/upgrades/series` in the Charm Guide for details.
As next steps, consider browsing these documentation sources:

9
deploy-guide/source/index.rst
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@ -21,15 +21,6 @@ OpenStack Charms usage. To help improve it you can `file an issue`_ or
install-openstack
configure-openstack
.. toctree::
:caption: Upgrades
:maxdepth: 1
Overview <upgrade-overview>
upgrade-charms
upgrade-openstack
upgrade-series
.. LINKS
.. _file an issue: https://bugs.launchpad.net/charm-deployment-guide/+filebug
.. _submit a contribution: https://opendev.org/openstack/charm-deployment-guide

5
deploy-guide/source/install-openstack.rst
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@ -41,9 +41,8 @@ nodes will be used during the install of each OpenStack application. Note that
some applications are not part of the OpenStack project per se and therefore do
not apply (exceptionally, Ceph applications do use this method).
See :ref:`Perform the upgrade <perform_the_upgrade>` on the :doc:`OpenStack
Upgrade <upgrade-openstack>` page for more details on cloud archive releases
and how they are used when upgrading OpenStack.
See :ref:`cg:perform_the_upgrade` in the Charm Guide for more details on cloud
archive releases and how they are used when upgrading OpenStack.
.. important::

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272
deploy-guide/source/upgrade-charms.rst
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@ -1,272 +0,0 @@
==============
Charms upgrade
==============
The Juju command to use is :command:`upgrade-charm`. For extra guidance see
`How to upgrade applications`_ in the Juju documentation.
Please read the following before continuing:
* :doc:`upgrade-overview`
* :doc:`cg:release-notes/index`
* :doc:`cg:project/issues-and-procedures`
.. note::
A charm upgrade affects all corresponding units; upgrading on a per-unit
basis is not currently supported.
Upgrade order
-------------
There is no special order in which to upgrade the charms. The order described
here is based on the upgrade order for :ref:`OpenStack upgrades
<openstack_upgrade_order>`, which, in turn, is the order used by internal
testing.
.. note::
Although it may be possible to upgrade some charms concurrently it is
recommended that charm upgrades be performed sequentially (i.e. one at a
time). Verify a charm upgrade before moving on to the next.
The general order is:
#. all principal charms
#. all subordinate charms
The precise order within the group of principal charms is shown in the below
table.
.. note::
At this time, only stable charms are listed in the upgrade order table.
.. list-table:: Principal charms
:header-rows: 1
:widths: auto
* - Order
- Charm
* - 1
- `percona-cluster`_ or `mysql-innodb-cluster`_
* - 2
- `rabbitmq-server`_
* - 3
- `ceph-mon`_
* - 4
- `keystone`_
* - 5
- `aodh`_
* - 6
- `barbican`_
* - 7
- `ceilometer`_
* - 8
- `ceph-fs`_
* - 9
- `ceph-radosgw`_
* - 10
- `cinder`_
* - 11
- `designate`_
* - 12
- `designate-bind`_
* - 13
- `glance`_
* - 14
- `gnocchi`_
* - 15
- `heat`_
* - 16
- `manila`_
* - 17
- `manila-ganesha`_
* - 18
- `neutron-api`_
* - 19
- `neutron-gateway`_ or `ovn-dedicated-chassis`_
* - 20
- `ovn-central`_
* - 21
- `placement`_
* - 22
- `nova-cloud-controller`_
* - 23
- `nova-compute`_
* - 24
- `openstack-dashboard`_
* - 25
- `ceph-osd`_
* - 26
- `swift-proxy`_
* - 27
- `swift-storage`_
* - 28
- `octavia`_
Upgrade testing for subordinate charms does not follow a prescribed order. Once
all the principal charms have been processed all the subordinate charms can
then be upgraded in any order.
Perform the upgrade
-------------------
Prior to upgrading a charm, say keystone, a (partial) output to :command:`juju
status` may look like:
.. code-block:: console
App Version Status Scale Charm Store Rev OS Notes
keystone 15.0.0 active 1 keystone jujucharms 306 ubuntu
Unit Workload Agent Machine Public address Ports Message
keystone/0* active idle 3/lxd/1 10.248.64.69 5000/tcp Unit is ready
Here, as deduced from the Keystone **service** version of '15.0.0', the cloud
is running Stein. The 'keystone' **charm** however shows a revision number of
'306'. Upon charm upgrade, the service version will remain unchanged but the
charm revision is expected to increase in number.
So to upgrade the keystone charm:
.. code-block:: none
juju upgrade-charm keystone
The upgrade progress can be monitored via :command:`juju status`. Any
encountered problem will surface as a message in its output. This sample
(partial) output reflects a successful upgrade:
.. code-block:: console
App Version Status Scale Charm Store Rev OS Notes
keystone 15.0.0 active 1 keystone jujucharms 309 ubuntu
Unit Workload Agent Machine Public address Ports Message
keystone/0* active idle 3/lxd/1 10.248.64.69 5000/tcp Unit is ready
This shows that the charm now has a revision number of '309' but Keystone
itself remains at '15.0.0'.
.. caution::
Any software changes that may have (exceptionally) been made to a charm
currently running on a unit will be overwritten by the target charm during
the upgrade.
Upgrade target revisions
~~~~~~~~~~~~~~~~~~~~~~~~
By default the :command:`upgrade-charm` command will upgrade a charm to its
latest stable revision (a possible multi-step upgrade). This means that
intervening revisions can be conveniently skipped. Use the ``--revision``
option to specify a target revision.
The current revision can be discovered via :command:`juju status` output (see
column 'Rev'). For the ceph-mon charm:
.. code-block:: console
App Version Status Scale Charm Store Rev OS Notes
ceph-mon 13.2.8 active 3 ceph-mon jujucharms 48 ubuntu
.. important::
As stated earlier, any kind of upgrade should first be tested in a
pre-production environment. OpenStack charm upgrades have been tested for
single-step upgrades only (N+1).
.. LINKS
.. _How to upgrade applications: https://juju.is/docs/olm/upgrade-applications
.. _Release Notes: https://docs.openstack.org/charm-guide/latest/release-notes.html
.. _aodh: https://opendev.org/openstack/charm-aodh/
.. _barbican: https://opendev.org/openstack/charm-barbican/
.. _barbican-vault: https://opendev.org/openstack/charm-barbican-vault/
.. _ceilometer: https://opendev.org/openstack/charm-ceilometer/
.. _ceilometer-agent: https://opendev.org/openstack/charm-ceilometer-agent/
.. _cinder: https://opendev.org/openstack/charm-cinder/
.. _cinder-backup: https://opendev.org/openstack/charm-cinder-backup/
.. _cinder-backup-swift-proxy: https://opendev.org/openstack/charm-cinder-backup-swift-proxy/
.. _cinder-ceph: https://opendev.org/openstack/charm-cinder-ceph/
.. _designate: https://opendev.org/openstack/charm-designate/
.. _glance: https://opendev.org/openstack/charm-glance/
.. _heat: https://opendev.org/openstack/charm-heat/
.. _keystone: https://opendev.org/openstack/charm-keystone/
.. _keystone-ldap: https://opendev.org/openstack/charm-keystone-ldap/
.. _keystone-saml-mellon: https://opendev.org/openstack/charm-keystone-saml-mellon/
.. _manila: https://opendev.org/openstack/charm-manila/
.. _manila-ganesha: https://opendev.org/openstack/charm-manila-ganesha/
.. _masakari: https://opendev.org/openstack/charm-masakari/
.. _masakari-monitors: https://opendev.org/openstack/charm-masakari-monitors/
.. _mysql-innodb-cluster: https://opendev.org/openstack/charm-mysql-innodb-cluster
.. _mysql-router: https://opendev.org/openstack/charm-mysql-router
.. _neutron-api: https://opendev.org/openstack/charm-neutron-api/
.. _neutron-api-plugin-arista: https://opendev.org/openstack/charm-neutron-api-plugin-arista
.. _neutron-api-plugin-ovn: https://opendev.org/openstack/charm-neutron-api-plugin-ovn
.. _neutron-dynamic-routing: https://opendev.org/openstack/charm-neutron-dynamic-routing/
.. _neutron-gateway: https://opendev.org/openstack/charm-neutron-gateway/
.. _neutron-openvswitch: https://opendev.org/openstack/charm-neutron-openvswitch/
.. _nova-cell-controller: https://opendev.org/openstack/charm-nova-cell-controller/
.. _nova-cloud-controller: https://opendev.org/openstack/charm-nova-cloud-controller/
.. _nova-compute: https://opendev.org/openstack/charm-nova-compute/
.. _octavia: https://opendev.org/openstack/charm-octavia/
.. _octavia-dashboard: https://opendev.org/openstack/charm-octavia-dashboard/
.. _octavia-diskimage-retrofit: https://opendev.org/openstack/charm-octavia-diskimage-retrofit/
.. _openstack-dashboard: https://opendev.org/openstack/charm-openstack-dashboard/
.. _placement: https://opendev.org/openstack/charm-placement
.. _swift-proxy: https://opendev.org/openstack/charm-swift-proxy/
.. _swift-storage: https://opendev.org/openstack/charm-swift-storage/
.. _ceph-fs: https://opendev.org/openstack/charm-ceph-fs/
.. _ceph-iscsi: https://opendev.org/openstack/charm-ceph-iscsi/
.. _ceph-mon: https://opendev.org/openstack/charm-ceph-mon/
.. _ceph-osd: https://opendev.org/openstack/charm-ceph-osd/
.. _ceph-proxy: https://opendev.org/openstack/charm-ceph-proxy/
.. _ceph-radosgw: https://opendev.org/openstack/charm-ceph-radosgw/
.. _ceph-rbd-mirror: https://opendev.org/openstack/charm-ceph-rbd-mirror/
.. _cinder-purestorage: https://opendev.org/openstack/charm-cinder-purestorage/
.. _designate-bind: https://opendev.org/openstack/charm-designate-bind/
.. _glance-simplestreams-sync: https://opendev.org/openstack/charm-glance-simplestreams-sync/
.. _gnocchi: https://opendev.org/openstack/charm-gnocchi/
.. _hacluster: https://opendev.org/openstack/charm-hacluster/
.. _ovn-central: https://opendev.org/x/charm-ovn-central
.. _ovn-chassis: https://opendev.org/x/charm-ovn-chassis
.. _ovn-dedicated-chassis: https://opendev.org/x/charm-ovn-dedicated-chassis
.. _pacemaker-remote: https://opendev.org/openstack/charm-pacemaker-remote/
.. _percona-cluster: https://opendev.org/openstack/charm-percona-cluster/
.. _rabbitmq-server: https://opendev.org/openstack/charm-rabbitmq-server/
.. _trilio-data-mover: https://opendev.org/openstack/charm-trilio-data-mover/
.. _trilio-dm-api: https://opendev.org/openstack/charm-trilio-dm-api/
.. _trilio-horizon-plugin: https://opendev.org/openstack/charm-trilio-horizon-plugin/
.. _trilio-wlm: https://opendev.org/openstack/charm-trilio-wlm/
.. _vault: https://opendev.org/openstack/charm-vault/

190
deploy-guide/source/upgrade-openstack-example-pre-juju-status.rst
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@ -1,190 +0,0 @@
:orphan:
.. code-block:: console
Model Controller Cloud/Region Version SLA Timestamp
openstack controller cloud/default 2.9.22 unsupported 02:25:29Z
App Version Status Scale Charm Store Channel Rev OS Message
ceph-mon 16.2.6 active 3 ceph-mon charmstore stable 62 ubuntu Unit is ready and clustered
ceph-osd 16.2.6 active 3 ceph-osd charmstore stable 316 ubuntu Unit is ready (1 OSD)
ceph-radosgw 16.2.6 active 1 ceph-radosgw charmstore stable 300 ubuntu Unit is ready
cinder 18.1.0 active 1 cinder charmstore stable 319 ubuntu Unit is ready
cinder-ceph 18.1.0 active 1 cinder-ceph charmstore stable 268 ubuntu Unit is ready
cinder-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
dashboard-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
glance 22.1.0 active 1 glance charmstore stable 313 ubuntu Unit is ready
glance-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
keystone 19.0.0 active 3 keystone charmstore stable 330 ubuntu Application Ready
keystone-hacluster active 3 hacluster charmstore stable 81 ubuntu Unit is ready and clustered
keystone-mysql-router 8.0.28 active 3 mysql-router charmstore stable 15 ubuntu Unit is ready
mysql-innodb-cluster 8.0.28 active 3 mysql-innodb-cluster charmstore stable 15 ubuntu Unit is ready: Mode: R/O, Cluster is ONLINE and can tolerate up to ONE failure.
neutron-api 18.1.1 active 1 neutron-api charmstore stable 304 ubuntu Unit is ready
neutron-api-plugin-ovn 18.1.1 active 1 neutron-api-plugin-ovn charmstore stable 50 ubuntu Unit is ready
neutron-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
nova-cloud-controller 23.1.0 active 1 nova-cloud-controller charmstore stable 363 ubuntu Unit is ready
nova-compute 23.1.0 active 3 nova-compute charmstore stable 337 ubuntu Unit is ready
nova-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
ntp 3.5 active 3 ntp charmstore stable 47 ubuntu chrony: Ready
openstack-dashboard 19.2.0 active 1 openstack-dashboard charmstore stable 318 ubuntu Unit is ready
ovn-central 20.12.0 active 3 ovn-central charmstore stable 16 ubuntu Unit is ready (leader: ovnnb_db, ovnsb_db)
ovn-chassis 20.12.0 active 3 ovn-chassis charmstore stable 21 ubuntu Unit is ready
placement 5.0.1 active 1 placement charmstore stable 32 ubuntu Unit is ready
placement-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
rabbitmq-server 3.8.2 active 1 rabbitmq-server charmstore stable 118 ubuntu Unit is ready
vault 1.5.9 active 1 vault charmstore stable 54 ubuntu Unit is ready (active: true, mlock: disabled)
vault-mysql-router 8.0.28 active 1 mysql-router charmstore stable 15 ubuntu Unit is ready
Unit Workload Agent Machine Public address Ports Message
ceph-mon/0* active idle 0/lxd/0 10.246.114.55 Unit is ready and clustered
ceph-mon/1 active idle 1/lxd/0 10.246.114.56 Unit is ready and clustered
ceph-mon/2 active idle 2/lxd/0 10.246.114.35 Unit is ready and clustered
ceph-osd/0 active idle 0 10.246.114.21 Unit is ready (1 OSD)
ceph-osd/1 active idle 1 10.246.114.22 Unit is ready (1 OSD)
ceph-osd/2* active idle 2 10.246.114.30 Unit is ready (1 OSD)
ceph-radosgw/0* active idle 0/lxd/1 10.246.114.47 80/tcp Unit is ready
cinder/0* active idle 2 10.246.114.30 8776/tcp Unit is ready
cinder-ceph/0* active idle 10.246.114.30 Unit is ready
cinder-mysql-router/0* active idle 10.246.114.30 Unit is ready
glance/0* active idle 2/lxd/1 10.246.114.34 9292/tcp Unit is ready
glance-mysql-router/0* active idle 10.246.114.34 Unit is ready
keystone/0* active idle 0/lxd/2 10.246.114.58 5000/tcp Unit is ready
keystone-hacluster/0* active idle 10.246.114.58 Unit is ready and clustered
keystone-mysql-router/0* active idle 10.246.114.58 Unit is ready
keystone/1 active idle 1/lxd/6 10.246.114.37 5000/tcp Unit is ready
keystone-hacluster/1 active idle 10.246.114.37 Unit is ready and clustered
keystone-mysql-router/1 active idle 10.246.114.37 Unit is ready
keystone/2 active idle 2/lxd/6 10.246.114.38 5000/tcp Unit is ready
keystone-hacluster/2 active idle 10.246.114.38 Unit is ready and clustered
keystone-mysql-router/2 active idle 10.246.114.38 Unit is ready
mysql-innodb-cluster/0 active idle 0/lxd/3 10.246.114.44 Unit is ready: Mode: R/O, Cluster is ONLINE and can tolerate up to ONE failure.
mysql-innodb-cluster/1* active idle 1/lxd/1 10.246.114.27 Unit is ready: Mode: R/W, Cluster is ONLINE and can tolerate up to ONE failure.
mysql-innodb-cluster/2 active idle 2/lxd/2 10.246.114.32 Unit is ready: Mode: R/O, Cluster is ONLINE and can tolerate up to ONE failure.
neutron-api/0* active idle 1/lxd/2 10.246.114.57 9696/tcp Unit is ready
neutron-api-plugin-ovn/0* active idle 10.246.114.57 Unit is ready
neutron-mysql-router/0* active idle 10.246.114.57 Unit is ready
nova-cloud-controller/0* active idle 0/lxd/4 10.246.114.25 8774/tcp,8775/tcp Unit is ready
nova-mysql-router/0* active idle 10.246.114.25 Unit is ready
nova-compute/0 active idle 0 10.246.114.21 Unit is ready
ntp/0* active idle 10.246.114.21 123/udp chrony: Ready
ovn-chassis/0* active idle 10.246.114.21 Unit is ready
nova-compute/1 active idle 1 10.246.114.22 Unit is ready
ntp/1 active idle 10.246.114.22 123/udp chrony: Ready
ovn-chassis/1 active idle 10.246.114.22 Unit is ready
nova-compute/2* active idle 2 10.246.114.30 Unit is ready
ntp/2 active idle 10.246.114.30 123/udp chrony: Ready
ovn-chassis/2 active idle 10.246.114.30 Unit is ready
openstack-dashboard/0* active idle 1/lxd/3 10.246.114.45 80/tcp,443/tcp Unit is ready
dashboard-mysql-router/0* active idle 10.246.114.45 Unit is ready
ovn-central/0* active idle 0/lxd/5 10.246.114.46 6641/tcp,6642/tcp Unit is ready (leader: ovnnb_db, ovnsb_db)
ovn-central/1 active idle 1/lxd/4 10.246.114.24 6641/tcp,6642/tcp Unit is ready (northd: active)
ovn-central/2 active idle 2/lxd/3 10.246.114.36 6641/tcp,6642/tcp Unit is ready
placement/0* active idle 2/lxd/4 10.246.114.33 8778/tcp Unit is ready
placement-mysql-router/0* active idle 10.246.114.33 Unit is ready
rabbitmq-server/0* active idle 2/lxd/5 10.246.114.59 5672/tcp Unit is ready
vault/0* active idle 1/lxd/5 10.246.114.26 8200/tcp Unit is ready (active: true, mlock: disabled)
vault-mysql-router/0* active idle 10.246.114.26 Unit is ready
Machine State DNS Inst id Series AZ Message
0 started 10.246.114.21 node-fontana focal default Deployed
0/lxd/0 started 10.246.114.55 juju-8bef4d-0-lxd-0 focal default Container started
0/lxd/1 started 10.246.114.47 juju-8bef4d-0-lxd-1 focal default Container started
0/lxd/2 started 10.246.114.58 juju-8bef4d-0-lxd-2 focal default Container started
0/lxd/3 started 10.246.114.44 juju-8bef4d-0-lxd-3 focal default Container started
0/lxd/4 started 10.246.114.25 juju-8bef4d-0-lxd-4 focal default Container started
0/lxd/5 started 10.246.114.46 juju-8bef4d-0-lxd-5 focal default Container started
1 started 10.246.114.22 node-sarabhai focal default Deployed
1/lxd/0 started 10.246.114.56 juju-8bef4d-1-lxd-0 focal default Container started
1/lxd/1 started 10.246.114.27 juju-8bef4d-1-lxd-1 focal default Container started
1/lxd/2 started 10.246.114.57 juju-8bef4d-1-lxd-2 focal default Container started
1/lxd/3 started 10.246.114.45 juju-8bef4d-1-lxd-3 focal default Container started
1/lxd/4 started 10.246.114.24 juju-8bef4d-1-lxd-4 focal default Container started
1/lxd/5 started 10.246.114.26 juju-8bef4d-1-lxd-5 focal default Container started
1/lxd/6 started 10.246.114.37 juju-8bef4d-1-lxd-6 focal default Container started
2 started 10.246.114.30 node-pytheas focal default Deployed
2/lxd/0 started 10.246.114.35 juju-8bef4d-2-lxd-0 focal default Container started
2/lxd/1 started 10.246.114.34 juju-8bef4d-2-lxd-1 focal default Container started
2/lxd/2 started 10.246.114.32 juju-8bef4d-2-lxd-2 focal default Container started
2/lxd/3 started 10.246.114.36 juju-8bef4d-2-lxd-3 focal default Container started
2/lxd/4 started 10.246.114.33 juju-8bef4d-2-lxd-4 focal default Container started
2/lxd/5 started 10.246.114.59 juju-8bef4d-2-lxd-5 focal default Container started
2/lxd/6 started 10.246.114.38 juju-8bef4d-2-lxd-6 focal default Container started
Relation provider Requirer Interface Type Message
ceph-mon:client cinder-ceph:ceph ceph-client regular
ceph-mon:client glance:ceph ceph-client regular
ceph-mon:client nova-compute:ceph ceph-client regular
ceph-mon:mon ceph-mon:mon ceph peer
ceph-mon:osd ceph-osd:mon ceph-osd regular
ceph-mon:radosgw ceph-radosgw:mon ceph-radosgw regular
ceph-radosgw:cluster ceph-radosgw:cluster swift-ha peer
cinder-ceph:ceph-access nova-compute:ceph-access cinder-ceph-key regular
cinder-ceph:storage-backend cinder:storage-backend cinder-backend subordinate
cinder-mysql-router:shared-db cinder:shared-db mysql-shared subordinate
cinder:cinder-volume-service nova-cloud-controller:cinder-volume-service cinder regular
cinder:cluster cinder:cluster cinder-ha peer
dashboard-mysql-router:shared-db openstack-dashboard:shared-db mysql-shared subordinate
glance-mysql-router:shared-db glance:shared-db mysql-shared subordinate
glance:cluster glance:cluster glance-ha peer
glance:image-service cinder:image-service glance regular
glance:image-service nova-cloud-controller:image-service glance regular
glance:image-service nova-compute:image-service glance regular
keystone-hacluster:ha keystone:ha hacluster subordinate
keystone-hacluster:hanode keystone-hacluster:hanode hacluster peer
keystone-mysql-router:shared-db keystone:shared-db mysql-shared subordinate
keystone:cluster keystone:cluster keystone-ha peer
keystone:identity-service ceph-radosgw:identity-service keystone regular
keystone:identity-service cinder:identity-service keystone regular
keystone:identity-service glance:identity-service keystone regular
keystone:identity-service neutron-api:identity-service keystone regular
keystone:identity-service nova-cloud-controller:identity-service keystone regular
keystone:identity-service openstack-dashboard:identity-service keystone regular
keystone:identity-service placement:identity-service keystone regular
mysql-innodb-cluster:cluster mysql-innodb-cluster:cluster mysql-innodb-cluster peer
mysql-innodb-cluster:coordinator mysql-innodb-cluster:coordinator coordinator peer
mysql-innodb-cluster:db-router cinder-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router dashboard-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router glance-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router keystone-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router neutron-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router nova-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router placement-mysql-router:db-router mysql-router regular
mysql-innodb-cluster:db-router vault-mysql-router:db-router mysql-router regular
neutron-api-plugin-ovn:neutron-plugin neutron-api:neutron-plugin-api-subordinate neutron-plugin-api-subordinate subordinate
neutron-api:cluster neutron-api:cluster neutron-api-ha peer
neutron-api:neutron-api nova-cloud-controller:neutron-api neutron-api regular
neutron-mysql-router:shared-db neutron-api:shared-db mysql-shared subordinate
nova-cloud-controller:cluster nova-cloud-controller:cluster nova-ha peer
nova-compute:cloud-compute nova-cloud-controller:cloud-compute nova-compute regular
nova-compute:compute-peer nova-compute:compute-peer nova peer
nova-compute:juju-info ntp:juju-info juju-info subordinate
nova-mysql-router:shared-db nova-cloud-controller:shared-db mysql-shared subordinate
ntp:ntp-peers ntp:ntp-peers ntp peer
openstack-dashboard:cluster openstack-dashboard:cluster openstack-dashboard-ha peer
ovn-central:ovsdb ovn-chassis:ovsdb ovsdb regular
ovn-central:ovsdb-cms neutron-api-plugin-ovn:ovsdb-cms ovsdb-cms regular
ovn-central:ovsdb-peer ovn-central:ovsdb-peer ovsdb-cluster peer
ovn-chassis:nova-compute nova-compute:neutron-plugin neutron-plugin subordinate
placement-mysql-router:shared-db placement:shared-db mysql-shared subordinate
placement:cluster placement:cluster openstack-ha peer
placement:placement nova-cloud-controller:placement placement regular
rabbitmq-server:amqp cinder:amqp rabbitmq regular
rabbitmq-server:amqp glance:amqp rabbitmq regular
rabbitmq-server:amqp neutron-api:amqp rabbitmq regular
rabbitmq-server:amqp nova-cloud-controller:amqp rabbitmq regular
rabbitmq-server:amqp nova-compute:amqp rabbitmq regular
rabbitmq-server:cluster rabbitmq-server:cluster rabbitmq-ha peer
vault-mysql-router:shared-db vault:shared-db mysql-shared subordinate
vault:certificates ceph-radosgw:certificates tls-certificates regular
vault:certificates cinder:certificates tls-certificates regular
vault:certificates glance:certificates tls-certificates regular
vault:certificates keystone:certificates tls-certificates regular
vault:certificates mysql-innodb-cluster:certificates tls-certificates regular
vault:certificates neutron-api-plugin-ovn:certificates tls-certificates regular
vault:certificates neutron-api:certificates tls-certificates regular
vault:certificates nova-cloud-controller:certificates tls-certificates regular
vault:certificates openstack-dashboard:certificates tls-certificates regular
vault:certificates ovn-central:certificates tls-certificates regular
vault:certificates ovn-chassis:certificates tls-certificates regular
vault:certificates placement:certificates tls-certificates regular
vault:cluster vault:cluster vault-ha peer

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:orphan:
=========================
OpenStack upgrade example
=========================
This document shows the specific steps used to perform an OpenStack upgrade.
They are based entirely on the :doc:`OpenStack upgrade <upgrade-openstack>`
page.
Cloud description
-----------------
The original cloud deployment was performed via this 'focal-wallaby'
``openstack-base`` `bundle`_. The backing cloud is a MAAS cluster consisting of
three physical machines.
In order to demonstrate upgrading an application running under HA with the aid
of the hacluster subordinate application, Keystone was scaled out post-deploy:
.. code-block:: none
juju add-unit -n 2 --to lxd:1,lxd:2 keystone
juju config keystone vip=10.246.116.11
juju deploy --config cluster_count=3 hacluster keystone-hacluster
juju add-relation keystone-hacluster:ha keystone:ha
The pre-upgrade state and topology of the cloud is given via this :doc:`model
status output <upgrade-openstack-example-pre-juju-status>`.
Objective
---------
Since the cloud was deployed with a UCA OpenStack release of 'focal-wallaby',
the upgrade target is 'focal-xena'. The approach taken is one that minimises
service downtime while the upgrade is in progress.
Prepare for the upgrade
-----------------------
It is assumed that the :ref:`preparatory steps <openstack_upgrade_prepare>`
have been completed.
Perform the upgrade
-------------------
Perform the upgrade by following the below sections.
Disable unattended-upgrades
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Disable unattended-upgrades on the three cloud nodes. Recall that each one
directly hosts multiple applications (e.g. ceph-osd, cinder, and nova-compute
are deployed on machine 2):
.. code-block:: none
juju ssh 0 sudo dpkg-reconfigure -plow unattended-upgrades
juju ssh 1 sudo dpkg-reconfigure -plow unattended-upgrades
juju ssh 2 sudo dpkg-reconfigure -plow unattended-upgrades
Answer 'No' to the resulting question.
Perform a backup of the service databases
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Determine the existing service databases and then back them up.
.. code-block:: none
PASSWORD=$(juju run -u mysql-innodb-cluster/leader leader-get mysql.passwd)
juju ssh mysql-innodb-cluster/leader "mysql -u root -p${PASSWORD} -e 'SHOW DATABASES;'"
+-------------------------------+
| Database |
+-------------------------------+
| cinder |
| glance |
| horizon |
| information_schema |
| keystone |
| mysql |
| mysql_innodb_cluster_metadata |
| neutron |
| nova |
| nova_api |
| nova_cell0 |
| performance_schema |
| placement |
| sys |
| vault |
+-------------------------------+
By omitting the system databases we are left with:
* ``cinder``
* ``glance``
* ``horizon``
* ``keystone``
* ``neutron``
* ``nova``
* ``nova_api``
* ``nova_cell0``
* ``placement``
* ``vault``
Now run the following commands:
.. code-block:: none
juju run-action --wait mysql-innodb-cluster/0 mysqldump \
databases=cinder,glance,horizon,keystone,neutron,nova,nova_api,nova_cell0,placement,vault
juju run -u mysql-innodb-cluster/0 -- sudo chmod o+rx /var/backups/mysql
juju scp -- -r mysql-innodb-cluster/0:/var/backups/mysql .
juju run -u mysql-innodb-cluster/0 -- sudo chmod o-rx /var/backups/mysql
Move the transferred archive to a safe location (off of the client host).
Archive old database data
~~~~~~~~~~~~~~~~~~~~~~~~~
Archive old database data by running an action on any nova-cloud-controller
unit:
.. code-block:: none
juju run-action --wait nova-cloud-controller/0 archive-data
Repeat this command until the action output reports 'Nothing was archived'.
Purge old compute service entries
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Purge any old compute service entries for nova-compute units that are no longer
part of the model. These entries will show as 'down' in the list of compute
services:
.. code-block:: none
openstack compute service list
To remove a compute service:
.. code-block:: none
openstack compute service delete <service-id>
List the upgrade order
~~~~~~~~~~~~~~~~~~~~~~
From an excerpt of the initial :command:`juju status` output, create an
inventory of running applications:
.. code-block:: console
ceph-mon
ceph-osd
ceph-radosgw
cinder
cinder-ceph
cinder-mysql-router
dashboard-mysql-router
glance
glance-mysql-router
keystone
keystone-mysql-router
mysql-innodb-cluster
neutron-api
neutron-api-plugin-ovn
neutron-mysql-router
nova-cloud-controller
nova-compute
nova-mysql-router
ntp
openstack-dashboard
ovn-central
ovn-chassis
placement
placement-mysql-router
rabbitmq-server
vault
vault-mysql-router
Ignore from the above all subordinate applications and those applications that
are not part of the UCA. After applying the recommended upgrade order we arrive
at the following ordered list:
#. ceph-mon
#. keystone
#. ceph-radosgw
#. cinder
#. glance
#. neutron-api
#. ovn-central
#. placement
#. nova-cloud-controller
#. openstack-dashboard
#. nova-compute
#. ceph-osd
Upgrade each application
~~~~~~~~~~~~~~~~~~~~~~~~
Upgrade each application in turn.
ceph-mon
^^^^^^^^
Although there are three units of the ceph-mon application, the all-in-one
method is used because the ceph-mon charm is able to maintain service
availability during the upgrade:
.. code-block:: none
juju config ceph-mon source=cloud:focal-xena
keystone
^^^^^^^^
There are three units of the keystone application and its charm supports the
three actions that the paused-single-unit method demands. In addition, the
keystone application is running under HA with the aid of the hacluster
application, which allows for a more controlled upgrade. Application leader
``keystone/0`` is upgraded first:
.. code-block:: none
juju config keystone action-managed-upgrade=True
juju config keystone openstack-origin=cloud:focal-xena
juju run-action --wait keystone-hacluster/0 pause
juju run-action --wait keystone/0 pause
juju run-action --wait keystone/0 openstack-upgrade
juju run-action --wait keystone/0 resume
juju run-action --wait keystone-hacluster/0 resume
juju run-action --wait keystone-hacluster/1 pause
juju run-action --wait keystone/1 pause
juju run-action --wait keystone/1 openstack-upgrade
juju run-action --wait keystone/1 resume
juju run-action --wait keystone-hacluster/1 resume
juju run-action --wait keystone-hacluster/2 pause
juju run-action --wait keystone/2 pause
juju run-action --wait keystone/2 openstack-upgrade
juju run-action --wait keystone/2 resume
juju run-action --wait keystone-hacluster/2 resume
ceph-radosgw
^^^^^^^^^^^^
There is only a single unit of the ceph-radosgw application. Use the all-in-one
method:
.. code-block:: none
juju config ceph-radosgw source=cloud:focal-xena
cinder
^^^^^^
There is only a single unit of the cinder application. Use the all-in-one
method:
.. code-block:: none
juju config cinder openstack-origin=cloud:focal-xena
glance
^^^^^^
There is only a single unit of the glance application. Use the all-in-one
method:
.. code-block:: none
juju config glance openstack-origin=cloud:focal-xena
neutron-api
^^^^^^^^^^^
There is only a single unit of the neutron-api application. Use the all-in-one
method:
.. code-block:: none
juju config neutron-api openstack-origin=cloud:focal-xena
ovn-central
^^^^^^^^^^^
Although there are three units of the ovn-central application, based on the
actions supported by the ovn-central charm, only the all-in-one method is
available:
.. code-block:: none
juju config ovn-central source=cloud:focal-xena
placement
^^^^^^^^^
There is only a single unit of the placement application. Use the all-in-one
method:
.. code-block:: none
juju config placement openstack-origin=cloud:focal-xena
nova-cloud-controller
^^^^^^^^^^^^^^^^^^^^^
There is only a single unit of the nova-cloud-controller application. Use the
all-in-one method:
.. code-block:: none
juju config nova-cloud-controller openstack-origin=cloud:focal-xena
openstack-dashboard
^^^^^^^^^^^^^^^^^^^
There is only a single unit of the openstack-dashboard application. Use the
all-in-one method:
.. code-block:: none
juju config openstack-dashboard openstack-origin=cloud:focal-xena
nova-compute
^^^^^^^^^^^^
There are three units of the nova-compute application and its charm supports
the three actions that the paused-single-unit method requires. Application
leader ``nova-compute/2`` is upgraded first:
.. code-block:: none
juju config nova-compute action-managed-upgrade=True
juju config nova-compute openstack-origin=cloud:focal-xena
juju run-action --wait nova-compute/2 pause
juju run-action --wait nova-compute/2 openstack-upgrade
juju run-action --wait nova-compute/2 resume
juju run-action --wait nova-compute/1 pause
juju run-action --wait nova-compute/1 openstack-upgrade
juju run-action --wait nova-compute/1 resume
juju run-action --wait nova-compute/0 pause
juju run-action --wait nova-compute/0 openstack-upgrade
juju run-action --wait nova-compute/0 resume
ceph-osd
^^^^^^^^
Although there are three units of the ceph-osd application, the all-in-one
method is used because the ceph-osd charm is able to maintain service
availability during the upgrade:
.. code-block:: none
juju config ceph-osd source=cloud:focal-xena
Re-enable unattended-upgrades
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Re-enable unattended-upgrades on the three cloud nodes:
.. code-block:: none
juju ssh 0 sudo dpkg-reconfigure -plow unattended-upgrades
juju ssh 1 sudo dpkg-reconfigure -plow unattended-upgrades
juju ssh 2 sudo dpkg-reconfigure -plow unattended-upgrades
Answer 'Yes' to resulting the question.
Verify the new deployment
~~~~~~~~~~~~~~~~~~~~~~~~~
Check for errors in :command:`juju status` output and any monitoring service.
Perform a routine battery of tests.
.. LINKS
.. _bundle: https://raw.githubusercontent.com/openstack-charmers/openstack-bundles/b1817add83ba56458aca1aa171ed9b74c211474d/stable/openstack-base/bundle.yaml

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=================
OpenStack upgrade
=================
This document outlines how to upgrade the OpenStack service components of a
Charmed OpenStack cloud.
.. warning::
Upgrading an OpenStack cloud is not risk-free. The procedures outlined in
this guide should first be tested in a pre-production environment.
Please read the :doc:`upgrade-overview` page before continuing.
.. note::
The charms only support single-step OpenStack upgrades (N+1). That is, to
upgrade two releases forward you need to upgrade twice. You cannot skip
releases when upgrading OpenStack with charms.
It may be worthwhile to read the upstream OpenStack `Upgrades`_ guide.
Software sources
----------------
A key part of an OpenStack upgrade is the stipulation of a unit's software
sources. For an upgrade, the latter will naturally reflect a more recent
combination of Ubuntu release (series) and OpenStack release. This combination
is based on the `Ubuntu Cloud Archive`_ and translates to a "cloud archive
OpenStack release". It takes on the following syntax:
``<ubuntu series>-<openstack-release>``
The value is passed to a charm's ``openstack-origin`` configuration option. For
example, to select the 'focal-victoria' release:
``openstack-origin=cloud:focal-victoria``
In this way the charm is informed on where to find updates for the packages
that it is responsible for.
Notes concerning the value of ``openstack-origin``:
* The default is 'distro'. This denotes an Ubuntu release's default archive
(e.g. in the case of the focal series it corresponds to OpenStack Ussuri).
The value of 'distro' is therefore invalid in the context of an OpenStack
upgrade.
* It should normally be the same across all charms.
* Its series component must be that of the series currently in use (i.e. a
series upgrade and an OpenStack upgrade are two completely separate
procedures).
.. note::
A few charms use option ``source`` instead of ``openstack-origin`` (both
options support identical values). The ``source`` option is used by charms
that don't deploy an actual OpenStack service.
Upgradable services
-------------------
Services whose software is not included in the `Ubuntu Cloud Archive`_ do not
get upgraded during a charmed OpenStack upgrade. This software is upgraded by
the administrator (on the units) using other means (e.g. manually via package
utilities, the Landscape management tool, a snap, or as part of a series
upgrade). Common charms where this applies are:
* memcached
* ntp
* percona-cluster
* mysql-innodb-cluster
* mysql-router
* rabbitmq-server
* vault
Services that are associated with subordinate charms are upgradable but only
indirectly. They get upgraded along with their parent principal application.
Subordinate charms do not support the ``openstack-origin`` (or ``source``)
configuration option that is, as will be shown, a pre-requisite for initiating
an OpenStack charm payload upgrade.
.. _openstack_upgrade_prepare:
Prepare for the upgrade
-----------------------
Pay special attention to the below pre-upgrade preparatory and informational
sections.
Release notes
~~~~~~~~~~~~~
The OpenStack Charms `Release notes`_ for the corresponding current and target
versions of OpenStack must be consulted for any special instructions. In
particular, pay attention to services and/or configuration options that may be
retired, deprecated, or changed.
Manual intervention
~~~~~~~~~~~~~~~~~~~
By design, the latest stable charms will support the software changes related
to the OpenStack services being upgraded. During the upgrade, the charms will
also strive to preserve the existing configuration of their associated
services. Upstream OpenStack is also designed to support N+1 upgrades. However,
there may still be times when intervention on the part of the operator is
needed. The :doc:`cg:project/issues-and-procedures` page covers this topic.
Ensure cloud node software is up to date
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Every machine in the cloud, including containers, should have their software
packages updated to ensure that the latest SRUs have been applied. This is done
in the usual manner:
.. code-block:: none
sudo apt update
sudo apt full-upgrade
Verify the current deployment
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Confirm that the output for the :command:`juju status` command of the current
deployment is error-free. In addition, if monitoring is in use (e.g. Nagios),
ensure that all alerts have been resolved. You may also consider running a
battery of operational checks on the cloud.
This step is to make certain that any issues that are apparent after the
upgrade are not due to pre-existing problems.
Perform the upgrade
-------------------
Perform the upgrade by following the below sections.
.. _disable_unattended_upgrades:
Disable unattended-upgrades
~~~~~~~~~~~~~~~~~~~~~~~~~~~
When performing a service upgrade on a cloud node that hosts multiple principal
charms (e.g. nova-compute and ceph-osd), ensure that ``unattended-upgrades`` is
disabled on the underlying machine for the duration of the upgrade process.
This is to prevent the other services from being upgraded outside of Juju's
control. On a cloud node run:
.. code-block:: none
sudo dpkg-reconfigure -plow unattended-upgrades
Perform a backup of the service databases
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Perform a backup of the cloud service databases by applying the ``mysqldump``
action to any unit of the cloud's database application. Be sure to select all
applicable databases; the commands provided are examples only.
The permissions on the remote backup directory will need to be adjusted in
order to access the data. Take note that the transfer method presented here
will capture all existing backups in that directory.
.. important::
Store the backup archive in a safe place.
The next two sections include the commands to run for the two possible database
applications.
percona-cluster
^^^^^^^^^^^^^^^
The percona-cluster application requires a modification to its "strict mode"
(see `Percona strict mode`_ for an understanding of the implications).
.. code-block:: none
juju run-action --wait percona-cluster/0 set-pxc-strict-mode mode=MASTER
juju run-action --wait percona-cluster/0 mysqldump \
databases=aodh,cinder,designate,glance,gnocchi,horizon,keystone,neutron,nova,nova_api,nova_cell0,placement
juju run-action --wait percona-cluster/0 set-pxc-strict-mode mode=ENFORCING
juju run -u percona-cluster/0 -- sudo chmod o+rx /var/backups/mysql
juju scp -- -r percona-cluster/0:/var/backups/mysql .
juju run -u percona-cluster/0 -- sudo chmod o-rx /var/backups/mysql
mysql-innodb-cluster
^^^^^^^^^^^^^^^^^^^^
.. code-block:: none
juju run-action --wait mysql-innodb-cluster/0 mysqldump \
databases=cinder,designate,glance,gnocchi,horizon,keystone,neutron,nova,nova_api,nova_cell0,placement,vault
juju run -u mysql-innodb-cluster/0 -- sudo chmod o+rx /var/backups/mysql
juju scp -- -r mysql-innodb-cluster/0:/var/backups/mysql .
juju run -u mysql-innodb-cluster/0 -- sudo chmod o-rx /var/backups/mysql
Archive old database data
~~~~~~~~~~~~~~~~~~~~~~~~~
During the upgrade, database migrations will be run. This operation can be
optimised by first archiving any stale data (e.g. deleted instances). Do this
by running the ``archive-data`` action on any nova-cloud-controller unit:
.. code-block:: none
juju run-action --wait nova-cloud-controller/0 archive-data
This action may need to be run multiple times until the action output reports
'Nothing was archived'.
Purge old compute service entries
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Old compute service entries for units which are no longer part of the model
should be purged prior to upgrading. These entries will show as 'down' (and be
hosted on machines no longer in the model) in the current list of compute
services:
.. code-block:: none
openstack compute service list
To remove a compute service:
.. code-block:: none
openstack compute service delete <service-id>
.. _openstack_upgrade_order:
List the upgrade order
~~~~~~~~~~~~~~~~~~~~~~
Generally speaking, the upgrade order is determined by the idea of a dependency
tree. Those services that have the most potential impact on other services are
upgraded first and those services that have the least potential impact on other
services are upgraded last.
In the below table, charms are listed in the order in which their corresponding
OpenStack services should be upgraded. Each service represented by a charm will
need to be upgraded individually. Note that since charms merely modify a
machine's apt sources, any co-located service will have their packages updated
along with those of the service being targeted.
.. warning::
Ceph may require one of its options to be set prior to upgrading, and
failure to consider this may result in a broken cluster. See the associated
:ref:`upgrade issue <ceph-require-osd-release>`.
.. note::
At this time, only stable charms are listed in the upgrade order table.
.. list-table::
:header-rows: 1
:widths: auto
* - Order
- Charm
* - 1
- `ceph-mon`_
* - 2
- `keystone`_
* - 3
- `aodh`_
* - 4
- `barbican`_
* - 5
- `ceilometer`_
* - 6
- `ceph-fs`_
* - 7
- `ceph-radosgw`_
* - 8
- `cinder`_
* - 9
- `designate`_
* - 10
- `designate-bind`_
* - 11
- `glance`_
* - 12
- `gnocchi`_
* - 13
- `heat`_
* - 14
- `manila`_
* - 15
- `manila-ganesha`_
* - 16
- `neutron-api`_
* - 17
- `neutron-gateway`_ or `ovn-dedicated-chassis`_
* - 18
- `ovn-central`_
* - 19
- `placement`_
* - 20
- `nova-cloud-controller`_
* - 21
- `nova-compute`_
* - 22
- `openstack-dashboard`_
* - 23
- `ceph-osd`_
* - 24
- `swift-proxy`_
* - 25
- `swift-storage`_
* - 26
- `octavia`_
.. important::
The OVN control plane will not be available between the commencement of the
ovn-central upgrade and the completion of the nova-compute upgrade.
Update the charm channel
------------------------
.. warning::
This step is only performed for charms that follow a channel (see
:ref:`Charm types <charm_types>`).
A charm's channel needs to be updated according to the target OpenStack
release. This is done as per the following syntax:
.. code-block:: none
juju refresh --channel=<channel> <application>
For example, if the cloud is being upgraded to OpenStack Yoga then the keystone
charm's channel should be updated to 'yoga/stable':
.. code-block:: none
juju refresh --channel=yoga/stable keystone
Charms whose services are not technically part of the OpenStack project will
generally use a channel naming scheme that is not based on OpenStack release
names. Here is the ovn-central charm:
.. code-block:: none
juju refresh --channel=22.03/stable ovn-central
.. _perform_the_upgrade:
Perform the upgrade
-------------------
There are three methods available for performing an OpenStack service upgrade,
two of which have charm requirements in terms of supported actions. Each
method also has advantages and disadvantages with regard to:
* the time required to perform an upgrade
* maintaining service availability during an upgrade
This table summarises the characteristics and requirements of each method:
+--------------------+----------+----------+--------------------------------------------------+
| Method | Time | Downtime | Charm requirements (actions) |
+====================+==========+==========+==================================================+
| all-in-one | shortest | most | *none* |
+--------------------+----------+----------+--------------------------------------------------+
| single-unit | medium | medium | ``openstack-upgrade`` |
+--------------------+----------+----------+--------------------------------------------------+
| paused-single-unit | longest | least | ``openstack-upgrade``, ``pause``, and ``resume`` |
+--------------------+----------+----------+--------------------------------------------------+
For example, although the all-in-one method upgrades a service the fastest, it
also has the greatest potential for service downtime.
.. note::
A charm's supported actions can be listed with command :command:`juju
actions <charm-name>`.
All-in-one
~~~~~~~~~~
The all-in-one method upgrades all application units simultaneously. This
method must be used if the application has a sole unit.
Although it is the quickest route, it will also cause a temporary disruption of
the corresponding service.
.. important::
Exceptionally, the ceph-osd and ceph-mon applications use the all-in-one
method but their charms are able to maintain service availability during the
upgrade.
The syntax is:
.. code-block:: none
juju config <openstack-charm> openstack-origin=cloud:<cloud-archive-release>
For example, to upgrade Cinder across all units (currently running Focal) from
Ussuri to Victoria:
.. code-block:: none
juju config cinder openstack-origin=cloud:focal-victoria
Charms whose services are not technically part of the OpenStack project will
use the ``source`` charm option instead. The Ceph charms are a classic example:
.. code-block:: none
juju config ceph-mon source=cloud:focal-victoria
Single-unit
~~~~~~~~~~~
The single-unit method builds upon the all-in-one method by allowing for the
upgrade of individual units in a controlled manner. The charm must support the
``openstack-upgrade`` action, which in turn guarantees the availability of the
``action-managed-upgrade`` option.
This method is slower than the all-in-one method due to the need for each unit
to be upgraded separately. There is a lesser chance of downtime as the unit
being upgraded must be in the process of servicing client requests for downtime
to occur.
As a general rule, whenever there is the possibility of upgrading units
individually, **always upgrade the application leader first**.
.. note::
The leader is the unit with a ***** next to it in the :command:`juju status`
output. It can also be discovered via the CLI:
.. code-block:: none
juju run -a <application-name> is-leader
For example, to upgrade a three-unit glance application from Ussuri to Victoria
where ``glance/1`` is the leader:
.. code-block:: none
juju config glance action-managed-upgrade=True
juju config glance openstack-origin=cloud:focal-victoria
juju run-action --wait glance/1 openstack-upgrade
juju run-action --wait glance/0 openstack-upgrade
juju run-action --wait glance/2 openstack-upgrade
.. _paused_single_unit:
Paused-single-unit
~~~~~~~~~~~~~~~~~~
The paused-single-unit method extends the single-unit method by allowing for
the upgrade of individual units while paused. Additional charm requirements are
the ``pause`` and ``resume`` actions.
This method provides more versatility by allowing a unit to be removed from
service, upgraded, and returned to service. Each of these are distinct events
whose timing is chosen by the operator.
This is the slowest method due to the need for each unit to be upgraded
separately in addition to the required pause/resume management. However, it is
the method that will result in the least downtime as clients will not be able
to solicit a paused service.
For example, to upgrade a three-unit nova-compute application from Ussuri to
Victoria where ``nova-compute/0`` is the leader:
.. code-block:: none
juju config nova-compute action-managed-upgrade=True
juju config nova-compute openstack-origin=cloud:focal-victoria
juju run-action --wait nova-compute/0 pause
juju run-action --wait nova-compute/0 openstack-upgrade
juju run-action --wait nova-compute/0 resume
juju run-action --wait nova-compute/1 pause
juju run-action --wait nova-compute/1 openstack-upgrade
juju run-action --wait nova-compute/1 resume
juju run-action --wait nova-compute/2 pause
juju run-action --wait nova-compute/2 openstack-upgrade
juju run-action --wait nova-compute/2 resume
In addition, this method also permits a possible hacluster subordinate unit,
which typically manages a VIP, to be paused so that client requests will never
even be directed to the associated parent unit.
.. attention::
When there is an hacluster subordinate unit then it is recommended to always
take advantage of the pause-single-unit method's ability to pause it before
upgrading the parent unit.
For example, to upgrade a three-unit keystone application from Ussuri to
Victoria where ``keystone/2`` is the leader:
.. code-block:: none
juju config keystone action-managed-upgrade=True
juju config keystone openstack-origin=cloud:focal-victoria
juju run-action --wait keystone-hacluster/1 pause
juju run-action --wait keystone/2 pause
juju run-action --wait keystone/2 openstack-upgrade
juju run-action --wait keystone/2 resume
juju run-action --wait keystone-hacluster/1 resume
juju run-action --wait keystone-hacluster/2 pause
juju run-action --wait keystone/1 pause
juju run-action --wait keystone/1 openstack-upgrade
juju run-action --wait keystone/1 resume
juju run-action --wait keystone-hacluster/2 resume
juju run-action --wait keystone-hacluster/0 pause
juju run-action --wait keystone/0 pause
juju run-action --wait keystone/0 openstack-upgrade
juju run-action --wait keystone/0 resume
juju run-action --wait keystone-hacluster/0 resume
.. warning::
The hacluster subordinate unit number may not necessarily match its parent
unit number. As in the above example, only for ``keystone/0`` do the unit
numbers correspond (i.e. ``keystone-hacluster/0`` is its subordinate unit).
Re-enable unattended-upgrades
-----------------------------
In a :ref:`previous step <disable_unattended_upgrades>`, unattended-upgrades
were disabled on those cloud nodes that hosted multiple principal charms. Once
such a node has had all of its services upgraded, unattended-upgrades should be
re-enabled:
.. code-block:: none
sudo dpkg-reconfigure -plow unattended-upgrades
Verify the new deployment
-------------------------
Check for errors in :command:`juju status` output and any monitoring service.
Example upgrade
---------------
The :doc:`OpenStack upgrade example <upgrade-openstack-example>` page shows the
explicit steps used to upgrade a basic cloud.
.. LINKS
.. _Ubuntu Cloud Archive: https://wiki.ubuntu.com/OpenStack/CloudArchive
.. _Upgrades: https://docs.openstack.org/operations-guide/ops-upgrades.html
.. _Percona strict mode: https://www.percona.com/doc/percona-xtradb-cluster/LATEST/features/pxc-strict-mode.html
.. BUGS
.. _LP #1825999: https://bugs.launchpad.net/charm-nova-compute/+bug/1825999
.. _LP #1809190: https://bugs.launchpad.net/charm-neutron-gateway/+bug/1809190
.. _LP #1853173: https://bugs.launchpad.net/charm-openstack-dashboard/+bug/1853173
.. _LP #1828534: https://bugs.launchpad.net/charm-designate/+bug/1828534
.. _aodh: https://opendev.org/openstack/charm-aodh/
.. _barbican: https://opendev.org/openstack/charm-barbican/
.. _barbican-vault: https://opendev.org/openstack/charm-barbican-vault/
.. _ceilometer: https://opendev.org/openstack/charm-ceilometer/
.. _ceilometer-agent: https://opendev.org/openstack/charm-ceilometer-agent/
.. _cinder: https://opendev.org/openstack/charm-cinder/
.. _cinder-backup: https://opendev.org/openstack/charm-cinder-backup/
.. _cinder-backup-swift-proxy: https://opendev.org/openstack/charm-cinder-backup-swift-proxy/
.. _cinder-ceph: https://opendev.org/openstack/charm-cinder-ceph/
.. _designate: https://opendev.org/openstack/charm-designate/
.. _glance: https://opendev.org/openstack/charm-glance/
.. _heat: https://opendev.org/openstack/charm-heat/
.. _keystone: https://opendev.org/openstack/charm-keystone/
.. _keystone-ldap: https://opendev.org/openstack/charm-keystone-ldap/
.. _keystone-saml-mellon: https://opendev.org/openstack/charm-keystone-saml-mellon/
.. _manila: https://opendev.org/openstack/charm-manila/
.. _manila-ganesha: https://opendev.org/openstack/charm-manila-ganesha/
.. _masakari: https://opendev.org/openstack/charm-masakari/
.. _masakari-monitors: https://opendev.org/openstack/charm-masakari-monitors/
.. _mysql-innodb-cluster: https://opendev.org/openstack/charm-mysql-innodb-cluster
.. _mysql-router: https://opendev.org/openstack/charm-mysql-router
.. _neutron-api: https://opendev.org/openstack/charm-neutron-api/
.. _neutron-api-plugin-arista: https://opendev.org/openstack/charm-neutron-api-plugin-arista
.. _neutron-api-plugin-ovn: https://opendev.org/openstack/charm-neutron-api-plugin-ovn
.. _neutron-dynamic-routing: https://opendev.org/openstack/charm-neutron-dynamic-routing/
.. _neutron-gateway: https://opendev.org/openstack/charm-neutron-gateway/
.. _neutron-openvswitch: https://opendev.org/openstack/charm-neutron-openvswitch/
.. _nova-cell-controller: https://opendev.org/openstack/charm-nova-cell-controller/
.. _nova-cloud-controller: https://opendev.org/openstack/charm-nova-cloud-controller/
.. _nova-compute: https://opendev.org/openstack/charm-nova-compute/
.. _octavia: https://opendev.org/openstack/charm-octavia/
.. _octavia-dashboard: https://opendev.org/openstack/charm-octavia-dashboard/
.. _octavia-diskimage-retrofit: https://opendev.org/openstack/charm-octavia-diskimage-retrofit/
.. _openstack-dashboard: https://opendev.org/openstack/charm-openstack-dashboard/
.. _placement: https://opendev.org/openstack/charm-placement
.. _swift-proxy: https://opendev.org/openstack/charm-swift-proxy/
.. _swift-storage: https://opendev.org/openstack/charm-swift-storage/
.. _ceph-fs: https://opendev.org/openstack/charm-ceph-fs/
.. _ceph-iscsi: https://opendev.org/openstack/charm-ceph-iscsi/
.. _ceph-mon: https://opendev.org/openstack/charm-ceph-mon/
.. _ceph-osd: https://opendev.org/openstack/charm-ceph-osd/
.. _ceph-proxy: https://opendev.org/openstack/charm-ceph-proxy/
.. _ceph-radosgw: https://opendev.org/openstack/charm-ceph-radosgw/
.. _ceph-rbd-mirror: https://opendev.org/openstack/charm-ceph-rbd-mirror/
.. _cinder-purestorage: https://opendev.org/openstack/charm-cinder-purestorage/
.. _designate-bind: https://opendev.org/openstack/charm-designate-bind/
.. _glance-simplestreams-sync: https://opendev.org/openstack/charm-glance-simplestreams-sync/
.. _gnocchi: https://opendev.org/openstack/charm-gnocchi/
.. _hacluster: https://opendev.org/openstack/charm-hacluster/
.. _ovn-central: https://opendev.org/x/charm-ovn-central
.. _ovn-chassis: https://opendev.org/x/charm-ovn-chassis
.. _ovn-dedicated-chassis: https://opendev.org/x/charm-ovn-dedicated-chassis
.. _pacemaker-remote: https://opendev.org/openstack/charm-pacemaker-remote/
.. _percona-cluster: https://opendev.org/openstack/charm-percona-cluster/
.. _rabbitmq-server: https://opendev.org/openstack/charm-rabbitmq-server/
.. _trilio-data-mover: https://opendev.org/openstack/charm-trilio-data-mover/
.. _trilio-dm-api: https://opendev.org/openstack/charm-trilio-dm-api/
.. _trilio-horizon-plugin: https://opendev.org/openstack/charm-trilio-horizon-plugin/
.. _trilio-wlm: https://opendev.org/openstack/charm-trilio-wlm/
.. _vault: https://opendev.org/openstack/charm-vault/

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=================
Upgrades overview
=================
The purpose of the Upgrades section is to show how to upgrade Charmed OpenStack
as a whole. This page provides a summary of the involved components and how
they relate to each other. The upgrade of each of the components are distinct
operations and are referred to as separate upgrade types. They are defined in
this way:
Charms upgrade
An upgrade of the charms that are used to deploy and manage Charmed
OpenStack. This includes charms that manage applications which are not
technically part of the OpenStack project such as Ceph, RabbitMQ, and Vault.
OpenStack upgrade
An upgrade of the software deployed by the OpenStack charms. Each application
is upgraded via its corresponding charm. This constitutes an upgrade from one
major OpenStack version to the next (e.g. Xena to Yoga).
Series upgrade
An upgrade of the Ubuntu operating system (e.g. Focal to Jammy) on the cloud
nodes. This includes containers.
.. important::
Once initiated, an upgrade type should be completed to its fullest extent
across the cloud. Operating a cloud consisting of partially upgraded
components is not tested nor supported.
Cloud topology
--------------
All upgrade procedures assume a specific hyperconverged cloud topology.
.. caution::
Any deviation from the described topology may require adjustments to the
given procedural steps. In particular, look at differences in co-located
principal applications.
The topology is defined in this way:
* Only compute and storage charms (and their subordinates) are co-located.
* Third-party charms either do not exist or have been thoroughly tested for all
three upgrade types.
* The following services run in LXD containers:
* all API applications
* the database application (percona-cluster or mysql-innodb-cluster)
* the rabbitmq-server application
* the ceph-mon application
* All applications, where possible, are under high availability, whether
natively (e.g. ceph-mon, rabbitmq-server) or via hacluster (e.g.
keystone).
Development notes
-----------------
This section includes charm development information that will better prepare
the administrator for the task of upgrading Charmed OpenStack.
* It is possible for a charm to gain new functionality that is only supported
starting with a specific OpenStack version (e.g. gnocchi S3 support with
Stein).
* A charm may occasionally only support a maximum or minimum series (e.g.
percona-cluster ending with eoan and mysql-innodb-cluster starting with
focal). This is normally due to upstream limitations (e.g Percona XtraDB
Cluster no longer supported on Focal).
.. note::
A charm's limitations concerning OpenStack versions and application features
are stated in its README file.
.. _charm_types:
Charm types
~~~~~~~~~~~
There are two general types of OpenStack charms: one that does use channels and
one that does not (legacy).
.. note::
For an overview of how charms are distributed to the end-user see
:doc:`cg:project/charm-delivery` in the Charm Guide.
Channels
^^^^^^^^
With the channels type, a channel is dedicated to a single OpenStack release
(release N-1 will be technically supported to assist with upgrades). This means
that a charm that works for a recent series-openstack combination will
generally not work on an older combination. Furthermore, there is a need to
switch to a different channel in order to upgrade to a new OpenStack version
- but not to a new series.
Legacy
^^^^^^
For the legacy charms, unless stated otherwise, each new revision of a charm
includes all the functionality of the previous revision. This means that a
charm that works for a recent series-openstack combination will also work on an
older combination.
The development of legacy charms has stopped at the 21.10 release of OpenStack
Charms (and at the 21.06 release of Trilio Charms). The last supported
series-openstack combination is ``focal-xena``.
Software release cycles
-----------------------
Each software component has a predictable release cycle.
.. list-table:: **Software release cycles**
:header-rows: 1
:widths: 14 12 50
* - Software
- Cycle (months)
- Schedule
* - OpenStack Charms
- 6
- https://docs.openstack.org/charm-guide/latest/release-schedule.html
* - OpenStack
- 6
- https://releases.openstack.org
* - Ubuntu
- 6
- https://wiki.ubuntu.com/Releases
Ubuntu LTS releases
~~~~~~~~~~~~~~~~~~~
One out of every four Ubuntu releases is an LTS release (i.e. 2 year cycle).
Charmed OpenStack must be LTS-based as OpenStack upgrades are dependent upon
the `Ubuntu Cloud Archive`_ (UCA), which only supports LTS releases.
The below graphic shows the release schedule of Ubuntu LTS releases and
upstream OpenStack versions. The Ubuntu project and the OpenStack project have
deliberately synchronised their respective release cycles.
.. figure:: ./media/ubuntu-openstack-release-cycle.png
:scale: 80%
:alt: Ubuntu OpenStack release cycle
.. role:: raw-html(raw)
:format: html
:raw-html:`<br />`
For example, a deployment can begin on Ubuntu 20.04 LTS (that supports
OpenStack Ussuri in its default package archive) and have the ability, over
time, to upgrade OpenStack through versions V, W, X, and Y.
.. note::
Charmed OpenStack on non-LTS Ubuntu releases is supported but should be
considered for testing purposes only.
Upgrade order
-------------
The order in which to upgrade the different software components is critical.
The generic upgrade order is:
#. charms (to latest stable revision for the current charm type)
#. OpenStack (to latest stable version on the current series)
#. series
#. OpenStack (to desired stable version on the new series)
An upgrade type can occur without the need for it to be followed by another
upgrade type. For instance, the charms can be upgraded without the necessity of
performing an OpenStack upgrade.
However the inverse is not true: in order to achieve an upgrade type there is a
requisite upgrade type that needs to be fulfilled. For instance, in order to
upgrade a series one needs to ensure that OpenStack has been upgraded to the
most recent available version on the current series.
.. note::
Irrespective of OpenStack or series upgrades, the charms should be upgraded
before making topological changes to the cloud, conducting charm application
migrations, or submitting bug reports.
Two example scenarios are provided next.
target: a specific Ubuntu release
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Current state: OpenStack Xena on Ubuntu 20.04 LTS
* Goal state: Ubuntu 22.04 LTS
Upgrade path:
#. Upgrade charms to latest stable revision for the current charm type
#. Upgrade OpenStack from Xena to Yoga
#. Upgrade series from focal to jammy
Final result: OpenStack Yoga on Ubuntu 22.04 LTS
target: a specific OpenStack version
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Current state: OpenStack Ussuri on Ubuntu 18.04 LTS
* Goal state: OpenStack Victoria
Upgrade path:
#. Upgrade charms to latest stable revision for the current charm type
#. Upgrade series from bionic to focal
#. Upgrade OpenStack from Ussuri to Victoria
Final result: OpenStack Victoria on Ubuntu 20.04 LTS
Disable automatic hook retries
------------------------------
For all upgrade types it is recommended to disable automatic hook retries
within the model containing the cloud. This will prevent the charms from
attempting to resolve any encountered problems, thus providing an early
opportunity for the operator to respond accordingly.
Assuming the cloud model is the current working model turn off hook retries in
this way:
.. code-block:: none
juju model-config automatically-retry-hooks=false
This change should normally be reverted once the upgrade is completed.
Next steps
----------
Each upgrade type is broken down into more detail on the following pages:
* :doc:`upgrade-charms`
* :doc:`upgrade-openstack`
* :doc:`upgrade-series`
.. LINKS
.. _Ubuntu Cloud Archive: https://wiki.ubuntu.com/OpenStack/CloudArchive

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==============
Series upgrade
==============
The purpose of this document is to provide foundational knowledge for preparing
an administrator to perform a series upgrade across a Charmed OpenStack cloud.
This translates to upgrading the operating system of every cloud node to an
entirely new version.
Please read the following before continuing:
* :doc:`upgrade-overview`
* :doc:`cg:release-notes/index`
* :doc:`cg:project/issues-and-procedures`
Once this document has been studied the administrator will be ready to graduate
to the :doc:`Series upgrade OpenStack <upgrade-series-openstack>` guide that
describes the process in more detail.
Concerning the cloud being operated upon, the following is assumed:
* It is being upgraded from one LTS series to another (e.g. xenial to
bionic, bionic to focal, etc.).
* Its nodes are backed by MAAS.
* Its services are highly available.
* It is being upgraded with minimal downtime.
.. warning::
Upgrading a single production machine from one LTS to another is a serious
task. Doing so for every cloud node can be that much harder. Attempting to
do this with minimal cloud downtime is an order of magnitude more complex.
Such an undertaking should be executed by persons who are intimately
familiar with Juju and the currently deployed charms (and their related
applications). It should first be tested on a non-production cloud that
closely resembles the production environment.
Upgrade candidate availability
------------------------------
Ensure that there is an upgrade candidate available. Charmed OpenStack is
primarily designed to run on Ubuntu LTS releases, and an Ubuntu system is
configured, by default, to upgrade only to the next LTS. In addition, this will
be possible only once the first LTS point release is published (see the `Ubuntu
releases wiki page`_ for release date information). For example, an upgrade to
Focal was possible starting on August 6, 2020.
.. caution::
The Juju tooling will initiate the upgrade process irrespective of whether
an upgrade candidate is available or not. A cancelled upgrade is not fatal,
but it will leave erroneous messaging in :command:`juju status` output.
The Juju :command:`upgrade-series` command
------------------------------------------
The Juju :command:`upgrade-series` command is the cornerstone of the entire
procedure. This command manages an operating system upgrade of a targeted
machine and operates on every application unit hosted on that machine. The
command works in conjunction with either the :command:`prepare` or the
:command:`complete` sub-command.
The basic process is to inform the units on a machine that a series upgrade
is about to commence, to perform the upgrade, and then inform the units that
the upgrade has finished. In most cases with the OpenStack charms, units will
first be paused and be left with a workload status of "blocked" and a message
of "Ready for do-release-upgrade and reboot."
For example, to inform units on machine '0' that an upgrade (to series
'bionic') is about to occur:
.. code-block:: none
juju upgrade-series 0 prepare bionic
The :command:`prepare` sub-command causes **all** the charms (including
subordinates) on the machine to run their ``pre-series-upgrade`` hook.
The administrator must then perform the traditional steps involved in upgrading
the OS on the targeted machine (in this example, machine '0'). For example,
update/upgrade packages with :command:`apt update && apt full-upgrade`; invoke
the :command:`do-release-upgrade` command; and reboot the machine once
complete.
The :command:`complete` sub-command causes **all** the charms (including
subordinates) on the machine to run their ``post-series-upgrade`` hook. In most
cases with the OpenStack charms, configuration files will be re-written, units
will be resumed automatically (if paused), and be left with a workload status
of "active" and a message of "Unit is ready":
.. code-block:: none
juju upgrade-series 0 complete
At this point the series upgrade on the machine and its charms is now done. In
the :command:`juju status` output the machine's entry under the Series column
will have changed from 'xenial' to 'bionic'.
.. note::
Charms are not obliged to support the two series upgrade hooks but they do
make for a more intelligent and a less error-prone series upgrade.
Containers (and their charms) hosted on the target machine remain unaffected by
this command. However, during the required post-upgrade reboot of the host all
containerised services will naturally be unavailable.
See the Juju documentation to learn more about the `series upgrade`_ feature.
.. _pre-upgrade_requirements:
Pre-upgrade requirements
------------------------
This is a list of requirements that apply to any cloud. They must be met before
making any changes.
* All the cloud nodes should be using the same series, be in good working
order, and be updated with the latest stable software packages (APT
upgrades).
* The cloud should be running the latest OpenStack release supported by the
current series. See `Ubuntu OpenStack release cycle`_ and `OpenStack
upgrade`_.
* The cloud should be fully operational and error-free.
* All currently deployed charms should be upgraded to the latest stable charm
revision. See `Charms upgrade`_.
* The Juju model comprising the cloud should be error-free (e.g. there should
be no charm hook errors).
.. _unattended_upgrades:
Unattended upgrades
-------------------
Automatic package updates should be disabled on a node that is about to undergo
a series upgrade. This is to avoid potential conflicts with the manual (or
scripted) APT steps. One way to achieve this is with:
.. code-block:: none
sudo dpkg-reconfigure -plow unattended-upgrades
Once the upgrade is complete it is advised to re-enable unattended upgrades for
security reasons.
.. _workload_specific_preparations:
Workload specific preparations
------------------------------
These are preparations that are specific to the current cloud deployment.
Completing them in advance is an integral part of the upgrade.
Charm upgradability
~~~~~~~~~~~~~~~~~~~
Verify the documented series upgrade processes for all currently deployed
charms. Some charms, especially third-party charms, may either not have
implemented series upgrade yet or simply may not work with the target series.
Pay particular attention to SDN (software defined networking) and storage
charms as these play a crucial role in cloud operations.
.. _workload_maintenance:
Workload maintenance
~~~~~~~~~~~~~~~~~~~~
Any workload-specific pre and post series upgrade maintenance tasks should be
readied in advance. For example, if a node's workload requires a database then
a pre-upgrade backup plan should be drawn up. Similarly, if a workload requires
settings to be adjusted post-upgrade then those changes should be prepared
ahead of time. Pay particular attention to stateful services due to their
importance in cloud operations. Examples include evacuating a compute node,
switching an HA router to another node, and storage rebalancing.
Pre-upgrade tasks are performed before issuing the :command:`prepare`
subcommand, and post-upgrade tasks are done immediately prior to issuing the
:command:`complete` subcommand.
Workflow: sequential vs. concurrent
-----------------------------------
In terms of the workflow there are two approaches:
* Sequential - upgrading one machine at a time
* Concurrent - upgrading a group of machines simultaneously
Normally, it is best to upgrade sequentially as this ensures data reliability
and availability (we've assumed an HA cloud). This approach also minimises
adverse effects to the deployment if something goes wrong.
However, for even moderately sized clouds, an intervention based purely on a
sequential approach can take a very long time to complete. This is where the
concurrent method becomes attractive.
In general, a concurrent approach is a viable option for API applications but
is not an option for stateful applications. During the course of the cloud-wide
series upgrade a hybrid strategy is a reasonable choice.
To be clear, the above pertains to upgrading the series on machines associated
with a single application. It is also possible however to employ similar
thinking to multiple applications.
Application leadership
----------------------
`Application leadership`_ plays a role in determining the order in which
machines will have their series upgraded. The guiding principle is that an
application's non-leader units (if they exist) are upgraded (in no particular
order) prior to its leader unit. There are exceptions to this however, and they
will be indicated on the :doc:`Series upgrade OpenStack
<upgrade-series-openstack>` page.
.. note::
Juju will not transfer the leadership of an application (and any
subordinate) to another unit while the application is undergoing a series
upgrade. This allows a charm to make assumptions that will lead to a more
reliable outcome.
Assuming that a cloud is intended to eventually undergo a series upgrade, this
guideline will generally influence the cloud's topology. Containerisation is an
effective response to this.
.. important::
Applications should be co-located on the same machine only if leadership
plays a negligible role. Applications deployed with the compute and storage
charms fall into this category.
.. _generic_series_upgrade:
Generic series upgrade
----------------------
This section contains a generic overview of a series upgrade for three
machines, each hosting a unit of the `ubuntu`_ application. The initial and
target series are xenial and bionic, respectively.
This scenario is represented by the following :command:`juju status` command
output:
.. code-block:: console
Model Controller Cloud/Region Version SLA Timestamp
upgrade maas-controller mymaas/default 2.7.6 unsupported 18:33:49Z
App Version Status Scale Charm Store Rev OS Notes
ubuntu1 16.04 active 3 ubuntu jujucharms 15 ubuntu
Unit Workload Agent Machine Public address Ports Message
ubuntu1/0* active idle 0 10.0.0.241 ready
ubuntu1/1 active idle 1 10.0.0.242 ready
ubuntu1/2 active idle 2 10.0.0.243 ready
Machine State DNS Inst id Series AZ Message
0 started 10.0.0.241 node2 xenial zone3 Deployed
1 started 10.0.0.242 node3 xenial zone4 Deployed
2 started 10.0.0.243 node1 xenial zone5 Deployed
.. important::
The asterisk in the Unit column denotes the leader. Here, ``ubuntu1/0`` is
the leader and its machine ID is 0.
First ensure that any new applications will (by default) use the new series, in
this case bionic. This is done by configuring at the model level:
.. code-block:: none
juju model-config default-series=bionic
Now do the same at the application level. This will affect any new units of the
existing application, in this case 'ubuntu1':
.. code-block:: none
juju set-series ubuntu1 bionic
To perform the actual series upgrade we begin with a non-leader machine (1):
.. code-block:: none
:linenos:
# Perform any workload maintenance pre-upgrade steps here
juju upgrade-series 1 prepare bionic
juju ssh 1 sudo apt update
juju ssh 1 sudo apt full-upgrade
juju ssh 1 sudo do-release-upgrade
# Perform any workload maintenance post-upgrade steps here
# Reboot the machine (if not already done)
juju upgrade-series 1 complete
.. note::
It is recommended to use a terminal multiplexer (e.g. tmux) in order to
prevent a network disruption from breaking the invoked commands.
In this generic example there are no `workload maintenance`_ steps to perform.
If there were post-upgrade steps then the prompt to reboot the machine at the
end of :command:`do-release-upgrade` should be answered in the negative and the
reboot will be initiated manually on line 7 (i.e. :command:`sudo reboot`).
It is possible to invoke the :command:`complete` sub-command before the
upgraded machine is ready to process it. Juju will block until the unit is
ready after being restarted.
In lines 4 and 5 the upgrade proceeds in the usual interactive fashion. If a
non-interactive mode is preferred, those two lines can be replaced with:
.. code-block:: none
juju ssh 1 sudo DEBIAN_FRONTEND=noninteractive apt-get --assume-yes \
-o "Dpkg::Options::=--force-confdef" \
-o "Dpkg::Options::=--force-confold" dist-upgrade
juju ssh 1 sudo DEBIAN_FRONTEND=noninteractive \
do-release-upgrade -f DistUpgradeViewNonInteractive
The :command:`apt-get` command is preferred while in non-interactive mode (or
with scripting).
By default, an LTS release will not have an upgrade candidate until the "point
release" of the next LTS is published. You can override this policy by using
the ``-d`` (development) option with the :command:`do-release-upgrade` command.
.. caution::
Performing a series upgrade non-interactively can be risky so the decision
to do so should be made only after careful deliberation.
The remaining non-leader machine (2) is then upgraded:
.. code-block:: none
juju upgrade-series 2 prepare bionic
...
...
Finally, the leader machine (0) is upgraded in the same way.
Next steps
----------
When you are ready to perform a series upgrade across your cloud proceed to
the :doc:`Series upgrade OpenStack <upgrade-series-openstack>` page.
.. LINKS
.. _Ubuntu releases wiki page: https://wiki.ubuntu.com/Releases
.. _Charms upgrade: upgrade-charms.html
.. _OpenStack upgrade: upgrade-openstack.html
.. _Known OpenStack upgrade issues: upgrade-issues.html
.. _series upgrade: https://discourse.charmhub.io/t/upgrading-a-machines-series
.. _Ubuntu OpenStack release cycle: https://ubuntu.com/about/release-cycle#ubuntu-openstack-release-cycle
.. _Application leadership: https://discourse.charmhub.io/t/implementing-leadership
.. _ubuntu: https://jaas.ai/ubuntu

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@ -56,3 +56,8 @@
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/project-deploy-guide/charm-deployment-guide/latest/ovn-migration.html 301 /charm-guide/latest/project/procedures/ovn-migration.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-special.html 301 /charm-guide/latest/project/issues-and-procedures.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-charms.html 301 /charm-guide/latest/admin/upgrades/charms.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-series.html 301 /charm-guide/latest/admin/upgrades/series.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-series-openstack.html 301 /charm-guide/latest/admin/upgrades/series-openstack.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-openstack.html 301 /charm-guide/latest/admin/upgrades/openstack.html
/project-deploy-guide/charm-deployment-guide/latest/upgrade-overview.html 301 /charm-guide/latest/admin/upgrades/overview.html