We get a nice optimisation by using a filtered loop instead
of task skipping per service with 'when'.
Partially-Implements: blueprint performance-improvements
Change-Id: I8f68100870ab90cb2d6b68a66a4c97df9ea4ff52
By default, Ansible injects a variable for every fact, prefixed with
ansible_. This can result in a large number of variables for each host,
which at scale can incur a performance penalty. Ansible provides a
configuration option [0] that can be set to False to prevent this
injection of facts. In this case, facts should be referenced via
ansible_facts.<fact>.
This change updates all references to Ansible facts within Kolla Ansible
from using individual fact variables to using the items in the
ansible_facts dictionary. This allows users to disable fact variable
injection in their Ansible configuration, which may provide some
performance improvement.
This change disables fact variable injection in the ansible
configuration used in CI, to catch any attempts to use the injected
variables.
[0] https://docs.ansible.com/ansible/latest/reference_appendices/config.html#inject-facts-as-vars
Change-Id: I7e9d5c9b8b9164d4aee3abb4e37c8f28d98ff5d1
Partially-Implements: blueprint performance-improvements
Followup on I91e5c1840ace8f567daf462c4eb3ec1f0c503823
When+run_once do not play nicely. [1]
The general workaround is to use include_tasks. [2]
However, it is very unlikely user wishes to run this role
without having any pacemaker nodes so the simplification that we
use throughout the Kolla Ansible code should be enough.
[1] https://github.com/ansible/ansible/issues/11496
[2] https://github.com/ansible/ansible/issues/11496#issuecomment-412936547
Change-Id: Ifaf64e3d9d89b2ec36a883fb7458556745b64802
Adds HAcluster Ansible role. This role contains High Availability
clustering solution composed of Corosync, Pacemaker and Pacemaker Remote.
HAcluster is added as a helper role for Masakari which requires it for
its host monitoring, allowing to provide HA to instances on a failed
compute host.
Kolla hacluster images merged in [1].
[1] https://review.opendev.org/#/c/668765/
Change-Id: I91e5c1840ace8f567daf462c4eb3ec1f0c503823
Implements: blueprint ansible-pacemaker-support
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Co-Authored-By: Mark Goddard <mark@stackhpc.com>
