Operators will use the parameter_defaults section of any Heat
environment to set per service parameters.
+Apart from sevice specific inputs, there are few default parameters for all
+the services. Following are the list of default parameters:
+
+ * ServiceNetMap: Mapping of service_name -> network name. Default mappings
+ for service to network names are defined in
+ ../network/service_net_map.j2.yaml, which may be overridden via
+ ServiceNetMap values added to a user environment file via
+ parameter_defaults.
+
+ * EndpointMap: Mapping of service endpoint -> protocol. Contains a mapping of
+ endpoint data generated for all services, based on the data included in
+ ../network/endpoints/endpoint_data.yaml.
+
+ * DefaultPasswords: Mapping of service -> default password. Used to pass some
+ passwords from the parent templates, this is a legacy interface and should
+ not be used by new services.
+
+ * RoleName: Name of the role on which this service is deployed. A service can
+ be deployed in multiple roles. This is an internal parameter (should not be
+ set via environment file), which is fetched from the name attribute of the
+ roles_data.yaml template.
+
+ * RoleParameters: Parameter specific to a role on which the service is
+ applied. Using the format "<RoleName>Parameters" in the parameter_defaults
+ of user environment file, parameters can be provided for a specific role.
+ For example, in order to provide a parameter specific to "Compute" role,
+ below is the format::
+
+ parameter_defaults:
+ ComputeParameters:
+ Param1: value
+
+
Config Settings
---------------
-Each service may define a config_settings output variable which returns
-Hiera settings to be configured.
+Each service may define three ways in which to output variables to configure Hiera
+settings on the nodes.
-Steps
------
+ * config_settings: the hiera keys will be pushed on all roles of which the service
+ is a part of.
+
+ * global_config_settings: the hiera keys will be distributed to all roles
+
+ * service_config_settings: Takes an extra key to wire in values that are
+ defined for a service that need to be consumed by some other service.
+ For example:
+ service_config_settings:
+ haproxy:
+ foo: bar
+ This will set the hiera key 'foo' on all roles where haproxy is included.
+
+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
5) Service activation (Pacemaker)
- 6) Fencing (Pacemaker)
+Batch Upgrade Steps
+-------------------
+
+Each service template may optionally define a `upgrade_batch_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 (currently only two steps are supported, but
+more may be added when required as additional services get converted to batched
+upgrades).
+
+Note that each step is performed in batches, then we move on to the next step
+which is also performed in batches (we don't perform all steps on one node,
+then move on to the next one which means you can sequence rolling upgrades of
+dependent services via the step value).
+
+The tasks performed at each step is service specific, but note that all batch
+upgrade steps are performed before the `upgrade_tasks` described below. This
+means that all services that support rolling upgrades can be upgraded without
+downtime during `upgrade_batch_tasks`, then any remaining services are stopped
+and upgraded during `upgrade_tasks`
+
+The default batch size is 1, but this can be overridden for each role via the
+`upgrade_batch_size` option in roles_data.yaml
+
+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) Stop all control-plane services.
+
+ 2) Quiesce the control-plane, e.g disable LoadBalancer, stop
+ pacemaker cluster: this will stop the following resource:
+ - ocata:
+ - galera
+ - rabbit
+ - redis
+ - haproxy
+ - vips
+ - cinder-volumes
+ - cinder-backup
+ - manilla-share
+ - rbd-mirror
+
+ The exact order is controlled by the cluster constraints.
+
+ 3) Perform a package update and install new packages: A general
+ upgrade is done, and only new package should go into service
+ ansible tasks.
+
+ 4) Start services needed for migration tasks (e.g DB)
+
+ 5) Perform any migration tasks, e.g DB sync commands
+
+Note that the services are not started in the upgrade tasks - we instead re-run
+puppet which does any reconfiguration required for the new version, then starts
+the services.
+
+Nova Server Metadata Settings
+-----------------------------
+
+One can use the hook of type `OS::TripleO::ServiceServerMetadataHook` to pass
+entries to the nova instances' metadata. It is, however, disabled by default.
+In order to overwrite it one needs to define it in the resource registry. An
+implementation of this hook needs to conform to the following:
-Note: Not all roles currently support all steps:
+* It needs to define an input called `RoleData` of json type. This gets as
+ input the contents of the `role_data` for each role's ServiceChain.
- * ObjectStorage role only supports steps 2, 3 and 4
+* This needs to define an output called `metadata` which will be given to the
+ Nova Server resource as the instance's metadata.
Code Review / apex-tripleo-heat-templates.git / blobdiff