Can't use RBD backend for rabbitmq-server (ceph auth)

[Hybrid512]

Hi,

There are 2 bugs related to Ceph/RBD backend for RabbitMQ-server :

- first, it can't be done if RabbitMQ is installed in a lxd container (see https://bugs.launchpad.net/bugs/1906424)
- second, when installed on bare metal, there is a cephx error, rabbitmq-server is not authorized to create the RBD pool on the Ceph cluster.

./hooks/ceph-relation-changed
tmux kill-session -t rabbitmq-server/0 # or, equivalently, CTRL+a d

4. CTRL+a is tmux prefix.

More help and info is available in the online documentation:
https://discourse.jujucharms.com/t/debugging-charm-hooks

root@lab-mrs-cp1:/var/lib/juju/agents/unit-rabbitmq-server-0/charm# ./hooks/ceph-relation-changed
Error EACCES: access denied
Traceback (most recent call last):
  File "./hooks/ceph-relation-changed", line 974, in <module>
    hooks.execute(sys.argv)
  File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/charmhelpers/core/hookenv.py", line 945, in execute
    self._hooks[hook_name]()
  File "./hooks/ceph-relation-changed", line 623, in ceph_changed
    ceph.create_pool(service=SERVICE_NAME, name=POOL_NAME,
  File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/charmhelpers/contrib/storage/linux/ceph.py", line 1399, in create_pool
    check_call(cmd)
  File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['ceph', '--id', 'rabbitmq-server', 'osd', 'pool', 'create', 'rabbitmq-server', '1200']' returned non-zero exit status 13.