The use of 'include_tasks' and a loop of variables creates
a situation where a user is unable to use tags to scope the
inclusion of only the MQ tasks when running the playbooks.
The use-case this is important for is when the rabbitmq
containers are destroyed and rebuilt in order to resolve
an issue with them, and the user wishes to quickly recreate
all the vhosts/users.
Ansible's 'include_tasks' is a dynamic inclusion, and dynamic
inclusions are not included when using tags. The nice thing
about dynamic inclusions is that they completely skip all
tasks when the condition does not apply, cutting down deploy
time. However, given the use-case, we should rather take on
the extra deployment time.
This patch changes the dynamic inclusion to a static one,
adds a 'common-mq' tag to cover all MQ implementations,
and re-implements the 'common-rabbitmq' tag for the tasks
that relate to RabbitMQ specifically.
It also implements conditionals for each task set so that
the rpc/notify tasks can be skipped if a vhost/user is not
required for that purpose (eg: swift does not use RPC, and
most roles will not use notifications by default).
Depends-On: https://review.openstack.org/588191
Change-Id: I336d5520875dca8c5aac9455f3a22e903123d3a9
There is no record for why we implement the MQ vhost/user creation
outside of the role in the playbook, when we could do it inside the
role.
Implementing it inside the role allows us to reduce the quantity of
group_vars duplicated from the role, and allows us to better document
the required variables in the role. The delegation can still be done
as it is done in the playbook too.
In this patch we implement two new variables:
- tacker_oslomsg_rpc_setup_host
- tacker_oslomsg_notify_setup_host
These are used in the role to allow delegation of the MQ vhost/user
setup for each type to any host, but they default to using the first
member of the applicable oslomsg host group.
We also adjust some of the defaults to automatically inherit existing
vars set in group_vars form the integrated build so that we do not
need to do the wiring in the integrated build's group vars. We still
default them in the role too for independent role usage.
Finally, we remove the test mq setup tasks and clean up any unused
or unnecessary variables configured in tests.
Change-Id: I481b2358bf3b93fba3057b825fc9e0f626d616ba
Jonathan Rosser