opendev/system-config
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Add examples to make the disabling prose clearer

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The way disabling works with puppet and openstack inventory in ansible
can be confusing at first. Some examples hopefully clarify the
situation.

Change-Id: Ib85feebce309896c6f3d139318dd5d204d9cb8ec
This commit is contained in:
Monty Taylor 2015-12-04 13:49:38 -05:00
parent d665784f9e
commit 69ef1c7036
1 changed files with 42 additions and 0 deletions
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doc/source/sysadmin.rst
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@ -287,6 +287,17 @@ make changes through puppet. However, under some circumstances, you
may need to temporarily make a manual change to a puppet-managed
resource on a server.
OpenStack Infra uses a non-trivial combination of Dynamic and Static
Inventory in Ansible to control execution of puppet. A full understanding
of the concepts in
`Ansible Inventory Introduction
<http://docs.ansible.com/ansible/intro_inventory.html>`_
and
`Ansible Dynamic Inventory
<http://docs.ansible.com/ansible/intro_dynamic_inventory.html>`_
is essential for being able to make informed decisions about actions
to take.
In the case of needing to disable the running of puppet on a node, it's a
simple matter of adding an entry to the ansible inventory "disabled" group.
There are two inventory files available for this, `/etc/ansible/hosts/static`
@ -316,6 +327,37 @@ run directly on the host, it merely prevents the puppetmaster from causing
puppet to be run. If you choose to run puppet manually on a host, take care
to ensure that it has not been disabled at the puppetmaster level first.
Examples
--------
To disable an OpenStack instance called `amazing.openstack.org` temporarily
without landing a puppet change, ensure the following is in
`/etc/ansible/hosts/emergency`
::
[amazing.openstack.org]
[disabled:children]
amazing.openstack.org
To disable one of the OpenStack instances called `git.openstack.org`
temporarily without landing a puppet change but leaving the other running,
find its UUID via OpenStack tools and ensure it's in the emergency file.
::
[disabled]
811c5197-dba7-4d3a-a3f6-68ca5328b9a7
To disable a staticly defined host that is not an OpenStack host, such as
the Infra cloud controller hosts.
::
[disabled]
controller.useast.openstack.org
.. _cinder:
Cinder Volume Management