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========
services
========
A TripleO nested stack Heat template that encapsulates generic configuration
data to configure a specific service. This generally includes everything
needed to configure the service excluding the local bind ports which
are still managed in the per-node role templates directly (controller.yaml,
compute.yaml, etc.). All other (global) service settings go into
the puppet/service templates.
Input Parameters
----------------
Each service may define its own input parameters and defaults.
Operators will use the parameter_defaults section of any Heat
environment to set per service parameters.
Config Settings
---------------
Each service may define a config_settings output variable which returns
Hiera settings to be configured.
Deployment Steps
----------------
Each service may define an output variable which returns a puppet manifest
snippet that will run at each of the following steps. Earlier manifests
are re-asserted when applying latter ones.
* config_settings: Custom hiera settings for this service.
* global_config_settings: Additional hiera settings distributed to all roles.
* step_config: A puppet manifest that is used to step through the deployment
sequence. Each sequence is given a "step" (via hiera('step') that provides
information for when puppet classes should activate themselves.
Steps correlate to the following:
1) Load Balancer configuration
2) Core Services (Database/Rabbit/NTP/etc.)
3) Early Openstack Service setup (Ringbuilder, etc.)
4) General OpenStack Services
5) Service activation (Pacemaker)
Upgrade Steps
-------------
Each service template may optionally define a `upgrade_tasks` key, which is a
list of ansible tasks to be performed during the upgrade process.
Similar to the step_config, we allow a series of steps for the per-service
upgrade sequence, defined as ansible tasks with a tag e.g "step1" for the first
step, "step2" for the second, etc.
Steps/tages correlate to the following:
1) Quiesce the control-plane, e.g disable LoadBalancer, stop pacemaker cluster
2) Stop all control-plane services, ready for upgrade
3) Perform a package update, (either specific packages or the whole system)
4) Start services needed for migration tasks (e.g DB)
5) Perform any migration tasks, e.g DB sync commands
6) Start control-plane services
7) Any additional online migration tasks (e.g data migrations)
|
