Adding states to perform nova upgrade
The patch adds new states to perform service upgrade
along with service configuration and states to perform
small sanity test.
Related-PROD: PROD-21926
Change-Id: I62a978b96ea0b240e0b60867c56c6c61eac272b6
diff --git a/README.rst b/README.rst
index 2424232..d7fd61c 100644
--- a/README.rst
+++ b/README.rst
@@ -1081,6 +1081,65 @@
You can read more about it here:
https://docs.openstack.org/security-guide/databases/database-access-control.html
+Upgrades
+========
+
+Each openstack formula provide set of phases (logical bloks) that will help to
+build flexible upgrade orchestration logic for particular components. The list
+of phases might and theirs descriptions are listed in table below:
+
++-------------------------------+------------------------------------------------------+
+| State | Description |
++===============================+======================================================+
+| <app>.upgrade.service_running | Ensure that all services for particular application |
+| | are enabled for autostart and running |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.service_stopped | Ensure that all services for particular application |
+| | disabled for autostart and dead |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.pkgs_latest | Ensure that packages used by particular application |
+| | are installed to latest available version. |
+| | This will not upgrade data plane packages like qemu |
+| | and openvswitch as usually minimal required version |
+| | in openstack services is really old. The data plane |
+| | packages should be upgraded separately by `apt-get |
+| | upgrade` or `apt-get dist-upgrade` |
+| | Applying this state will not autostart service. |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.render_config | Ensure configuration is rendered actual version. +
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.pre | We assume this state is applied on all nodes in the |
+| | cloud before running upgrade. |
+| | Only non destructive actions will be applied during |
+| | this phase. Perform service built in service check |
+| | like (keystone-manage doctor and nova-status upgrade)|
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.upgrade.pre | Mostly applicable for data plane nodes. During this |
+| | phase resources will be gracefully removed from |
+| | current node if it is allowed. Services for upgraded |
+| | application will be set to admin disabled state to |
+| | make sure node will not participate in resources |
+| | scheduling. For example on gtw nodes this will set |
+| | all agents to admin disable state and will move all |
+| | routers to other agents. |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.upgrade | This state will basically upgrade application on |
+| | particular target. Stop services, render |
+| | configuration, install new packages, run offline |
+| | dbsync (for ctl), start services. Data plane should |
+| | not be affected, only OpenStack python services. |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.upgrade.post | Add services back to scheduling. |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.post | This phase should be launched only when upgrade of |
+| | the cloud is completed. Cleanup temporary files, |
+| | perform other post upgrade tasks. |
++-------------------------------+------------------------------------------------------+
+| <app>.upgrade.verify | Here we will do basic health checks (API CRUD |
+| | operations, verify do not have dead network |
+| | agents/compute services) |
++-------------------------------+------------------------------------------------------+
+
Documentation and Bugs
======================