Add oslo.messaging Queue Manager

Adds the variable ``om_enable_queue_manager`` to configure enabling
oslo.messaging Queue Manager for all services which use RabbitMQ. This
is enabled by default.

This is required before we can move away from transient queues
(``rabbit_transient_quorum_queue``) as Queue Manager is needed to avoid
consuming all erlang atoms after some time. It is also a useful feature
for debugging, as queues are now named with hostnames and services
included.

Also setting ``lock_path`` and mounting ``dev/shm`` is dependent on
``om_enable_queue_manager``, these are now enabled too. This will allow
us to backport these features to Caracal and Dalamation without
enforcing the changes right away.

Why is -t added for exec commands?
When using Podman, behavior differs from Docker regarding exec
commands. If -t (which allocates a pseudo-terminal) is not used, the
process runs as a child of podman exec without a PTY. This causes
Python inside the container to assign PGID=0 because the pseudo-terminal
is missing, leading to issues with non-existent paths like /proc/0/....
Adding -t ensures proper PGID assignment, preventing these issues and
ensuring consistent behavior across Docker and Podman.

Side-notes:
The quorum queue precheck needed to be updated as queue manager puts
"_fanout" on the end of the name instead.
We need to override the ``[oslo_messaging_rabbit] processname`` for
services running udner wsgi, as they will otherwise all use the same
processname ``mod_wsgi``. This will cause Permission Errors trying to
access the same file in shared memory as services run with different
users.

Change-Id: Iae5f268e778fbbd2b744dc71a84253ec9e758a99

1 files changed, 3 insertions, 0 deletions

diff --git a/ansible/roles/trove/templates/trove.conf.j2 b/ansible/roles/trove/templates/trove.conf.j2
index 6dd3b72f0..cc85f0c67 100644
--- a/ansible/roles/trove/templates/trove.conf.j2
+++ b/ansible/roles/trove/templates/trove.conf.j2
@@ -75,6 +75,9 @@ driver = noop
 {% endif %}
 
 [oslo_messaging_rabbit]
+{% if om_enable_queue_manager | bool %}
+use_queue_manager = true
+{% endif %}
 heartbeat_in_pthread = false
 {% if om_enable_rabbitmq_tls | bool %}
 ssl = true