rabbitmq_queue nrpe check fails due to /var/lib/rabbitmq-server/data permissions

[Zachary Zehring]

Context:
New openstack cloud deployment with 3 rabbitmq-server units on revision 104.

Problem:
All rabbitmq-server units had failing rabbitmq_queue checks in Nagios (UNKNOWN due to failing to read output from nrpe command). Running the check manually from the unit works only using sudo. Running as ubuntu user gives:

PermissionError: [Errno 13] Permission denied: '/var/lib/rabbitmq/data/juju-a79b06-5-lxd-20_queue_stats.dat'

Comparing to another cloud's rabbitmq-unit, this check works fine as the ubuntu user. The one difference between the two was /var/lib/rabbitmq/data directory. On the working one, this had permissions 755 compared to broken unit that had 750.

Workaround/fix:
Change the permissions of /var/lib/rabbitmq/data to 755

sudo chmod 755 /var/lib/rabbitmq/data