Flesh out usage documentation
This commit is contained in:
Mark Goddard
parent
41686a5031
commit
df20c90e2e
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@ -12,13 +12,64 @@ the bare metal nodes that will form the workload node pool.
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Configuration
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=============
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As an Ansible-based project, Kayobe is for the most part configured using YAML
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files.
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Configuration Location
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----------------------
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Kayobe configuration is by default located in ``/etc/kayobe`` on the Ansible
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control host. This can be overridden to a different location to avoid touching
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the system configuration directory by setting the environment variable
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control host. This location can be overridden to a different location to avoid
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touching the system configuration directory by setting the environment variable
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``KAYOBE_CONFIG_PATH``. Similarly, kolla configuration on the Ansible control
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host will by default be located in ``/etc/kolla`` and can be overridden via
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``KOLLA_CONFIG_PATH``.
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Configuration Directory Layout
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------------------------------
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The Kayobe configuration directory contains Ansible ``extra-vars`` files and
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the Ansible inventory. An example of the directory structure is as follows::
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extra-vars1.yml
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extra-vars2.yml
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inventory/
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group_vars/
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group1-vars
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group2-vars
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groups
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host_vars/
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host1-vars
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host2-vars
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hosts
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Configuration Patterns
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----------------------
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Ansible's variable precedence rules are `fairly well documented
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<http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable>`_
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and provide a mechanism we can use for providing site localisation and
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customisation of OpenStack in combination with some reasonable default values.
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For global configuration options, Kayobe typically uses the following patterns:
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- Playbook group variables for the *all* group in
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``<kayobe repo>/ansible/group_vars/all/*`` set **global defaults**. These
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files should not be modified.
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- Playbook group variables for other groups in
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``<kayobe repo>/ansible/group_vars/<group>/*`` set **defaults for some subsets
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of hosts**. These files should not be modified.
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- Extra-vars files in ``${KAYOBE_CONFIG_PATH}/*.yml`` set **custom values
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for global variables** and should be used to apply global site localisation
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and customisation. By default these variables are commented out.
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Additionally, variables can be set on a per-host basis using inventory host
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variables files in ``${KAYOBE_CONFIG_PATH}/inventory/host_vars/*``. It should
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be noted that variables set in extra-vars files take precedence over per-host
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variables.
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Configuring Kayobe
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------------------
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From a checkout of the Kayobe repository, the baseline Kayobe configuration
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should be copied to the Kayobe configuration path::
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@ -27,6 +78,30 @@ should be copied to the Kayobe configuration path::
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Once in place, each of the YAML and inventory files should be manually
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inspected and configured as required.
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Inventory
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^^^^^^^^^
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The inventory should contain the following hosts:
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Control host
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This should be localhost and should be a member of the ``config-mgmt``
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group.
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Seed hypervisor
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If provisioning a seed VM, a host should exist for the hypervisor that
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will run the VM, and should be a member of the ``seed-hypervisor`` group.
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Seed
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The seed host, whether provisioned as a VM by Kayobe or externally managed,
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should exist in the ``seed`` group.
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Cloud hosts and bare metal compute hosts are not required to exist in the
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inventory.
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Site Localisation and Customisation
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Site localisation and customisation is applied using Ansible extra-vars files
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in ``${KAYOBE_CONFIG_PATH}/*.yml``.
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Command Line Interface
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======================
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@ -68,9 +143,31 @@ To bootstrap the Ansible control host::
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(kayobe-venv) $ kayobe control host bootstrap
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Physical Network
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================
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The physical network can be managed by Kayobe, which uses Ansible's network
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modules. Currently Dell Network OS 6 and Dell Network OS 9 switches are
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supported but this could easily be extended. To provision the physical
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network::
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(kayobe-venv) $ kayobe physical network configure --group <group>
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The ``--group`` argument is used to specify an Ansible group containing
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the switches to be configured.
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Seed
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====
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VM Provisioning
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---------------
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.. note::
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It is not necesary to run the seed services in a VM. To use an existing
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bare metal host or a VM provisioned outside of Kayobe, this step may be
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skipped. Ensure that the Ansible inventory contains a host for the seed.
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The seed hypervisor should have CentOS and ``libvirt`` installed. It should
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have ``libvirt`` networks configured for all networks that the seed VM needs
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access to and a ``libvirt`` storage pool available for the seed VM's volumes.
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@ -81,10 +178,8 @@ To provision the seed VM::
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When this command has completed the seed VM should be active and accessible via
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SSH. Kayobe will update the Ansible inventory with the IP address of the VM.
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At this point the seed services need to be deployed on the seed VM. These
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services include Docker and the kolla ``bifrost-deploy`` container. This
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command will also build the Operating System image that will be used to deploy
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the overcloud nodes using Disk Image Builder (DIB).
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Host Configuration
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------------------
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To configure the seed host OS::
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@ -98,6 +193,14 @@ To configure the seed host OS::
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(kayobe-venv) $ kayobe seed host configure --wipe-disks
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Building Container Images
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-------------------------
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.. note::
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It is possible to use prebuilt container images from an image registry such
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as Dockerhub. In this case, this step can be skipped.
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It is possible to use prebuilt container images from an image registry such as
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Dockerhub. In some cases it may be necessary to build images locally either to
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apply local image customisation or to use a downstream version of kolla. To
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@ -105,16 +208,24 @@ build images locally::
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(kayobe-venv) $ kayobe seed container image build
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Deploying Containerised Services
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--------------------------------
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At this point the seed services need to be deployed on the seed VM. These
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services are deployed in the ``bifrost_deploy`` container. This command will
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also build the Operating System image that will be used to deploy the overcloud
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nodes using Disk Image Builder (DIB).
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To deploy the seed services in containers::
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(kayobe-venv) $ kayobe seed service deploy
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After this command has completed the seed services will be active.
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Accessing the Seed via SSH
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--------------------------
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Accessing the Seed via SSH (Optional)
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-------------------------------------
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For SSH access to the seed VM, first determine the seed VM's IP address. We can
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For SSH access to the seed, first determine the seed's IP address. We can
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use the ``kayobe configuration dump`` command to inspect the seed's IP
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address::
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@ -137,18 +248,55 @@ Leave the seed VM and return to the shell on the control host::
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Overcloud
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=========
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Discovery
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---------
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.. note::
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Automated discovery of the overcloud nodes is not currently documented.
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If discovery of the overcloud is not possible, a static inventory of servers
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using the bifrost ``servers.yml`` file format may be configured using the
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``kolla_bifrost_servers`` variable in ``${KAYOBE_CONFIG_PATH}/bifrost.yml``.
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Provisioning of the overcloud is performed by bifrost running in a container on
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the seed. A static inventory of servers may be configured using the
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``kolla_bifrost_servers`` variable. To provision the overcloud nodes::
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Discovery of the overcloud is supported by the ironic inspector service running
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in the ``bifrost_deploy`` container on the seed. The service is configured to
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PXE boot unrecognised MAC addresses with an IPA ramdisk for introspection. If
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an introspected node does not exist in the ironic inventory, ironic inspector
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will create a new entry for it.
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Discovery of the overcloud is triggered by causing the nodes to PXE boot using
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a NIC attached to the overcloud provisioning network. For many servers this
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will be the factory default and can be performed by powering them on.
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On completion of the discovery process, the overcloud nodes should be
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registered with the ironic service running in the seed host's
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``bifrost_deploy`` container. The node inventory can be viewed by executing
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the following on the seed::
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$ docker exec -it bifrost_deploy bash
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(bifrost_deploy) $ source env-vars
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(bifrost_deploy) $ ironic node-list
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In order to interact with these nodes using Kayobe, run the following command
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to add them to the Kayobe and bifrost Ansible inventories::
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(kayobe-venv) $ kayobe overcloud inventory discover
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Provisioning
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------------
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Provisioning of the overcloud is performed by the ironic service running in the
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bifrost container on the seed. To provision the overcloud nodes::
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(kayobe-venv) $ kayobe overcloud provision
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After this command has completed the overcloud nodes should have been
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provisioned with an OS image. To configure the overcloud hosts' OS::
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provisioned with an OS image. The command will wait for the nodes to become
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``active`` in ironic and accessible via SSH.
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Host Configuration
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------------------
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To configure the overcloud hosts' OS::
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(kayobe-venv) $ kayobe overcloud host configure
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@ -160,34 +308,69 @@ provisioned with an OS image. To configure the overcloud hosts' OS::
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(kayobe-venv) $ kayobe overcloud host configure --wipe-disks
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It is possible to use prebuilt container images from an image registry such as
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Dockerhub. In some cases it may be necessary to build images locally either to
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apply local image customisation or to use a downstream version of kolla. To
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build images locally::
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Building Container Images
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-------------------------
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.. note::
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It is possible to use prebuilt container images from an image registry such
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as Dockerhub. In this case, this step can be skipped.
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In some cases it may be necessary to build images locally either to apply local
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image customisation or to use a downstream version of kolla. To build images
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locally::
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(kayobe-venv) $ kayobe overcloud container image build
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Deploying Containerised Services
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--------------------------------
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To deploy the overcloud services in containers::
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(kayobe-venv) $ kayobe overcloud service deploy
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Once this command has completed the overcloud nodes should have OpenStack
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services running in Docker containers. Kolla-ansible writes out an environment
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file that can be used to access the OpenStack services::
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services running in Docker containers.
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Interacting with the Control Plane
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----------------------------------
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Kolla-ansible writes out an environment file that can be used to access the
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OpenStack services::
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$ source ${KOLLA_CONFIG_PATH:-/etc/kolla}/admin-openrc.sh
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Other Useful Commands
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=====================
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To run an arbitrary Kayobe playbook::
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Running Kayobe Playbooks on Demand
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----------------------------------
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In some situations it may be necessary to run an individual Kayobe playbook.
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Playbooks are stored in ``<kayobe repo>/ansible/*.yml``. To run an arbitrary
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Kayobe playbook::
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(kayobe-venv) $ kayobe playbook run <playbook> [<playbook>]
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Running Kolla-ansible Commands
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------------------------------
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To execute a kolla-ansible command::
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(kayobe-venv) $ kayobe kolla ansible run <command>
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To dump Kayobe configuration for one or more hosts::
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Dumping Kayobe Configuration
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----------------------------
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The Ansible configuration space is quite large, and it can be hard to determine
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the final values of Ansible variables. We can use Kayobe's
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``configuration dump`` command to view individual variables or the variables
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for one or more hosts. To dump Kayobe configuration for one or more hosts::
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(kayobe-venv) $ kayobe configuration dump
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The output is a JSON-formatted object mapping hosts to their hostvars.
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We can use the ``--var-name`` argument to inspect a particular variable or the
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``--host`` or ``--hosts`` arguments to view a variable or variables for a
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specific host or set of hosts.
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