slurmdbd has an invalid PID file location configuration in slurmdbd.conf

[NucciTheBoss]

Bug Description

The slurmdbd service is configured to place its PID file in /var/run/slurmdbd.pid, however, the service fails to create the PID file with permission denied as the slurm user cannot write to the /var/run directory. The PidFile location should be changed to /var/run/slurmdbd/slurmdbd.pid as /var/run/slurmdbd is owned by the slurm user.

slurm-charms/charms/slurmdbd/src/constants.py

Line 13 in 274fc85

"PidFile": "/var/run/slurmdbd.pid",

To Reproduce

1. tox run -e integration -- --keep-models
2. juju switch <model-name>
3. Wait for all units to reach active status...
4. juju ssh slurmdbd/leader
5. systemctl status slurmdbd
6. See permission denied error about the PID file...

Environment

Juju v3.5.3 on local LXD cloud running on Ubuntu 24.04. Using the latest development version of the slurmdbd charm.

Relevant log output

Dec 06 21:28:14 juju-9ba62c-2 systemd[1]: Started slurmdbd.service - Slurm DBD accounting daemon.
░░ Subject: A start job for unit slurmdbd.service has finished successfully
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ A start job for unit slurmdbd.service has finished successfully.
░░
░░ The job identifier is 2812.
Dec 06 21:28:14 juju-9ba62c-2 (slurmdbd)[5821]: slurmdbd.service: Referenced but unset environment variable evaluates to an empty string: SLURMDBD_OPTIONS
Dec 06 21:28:14 juju-9ba62c-2 slurmdbd[5821]: slurmdbd: error: Unable to open pidfile `/var/run/slurmdbd.pid': Permission denied

Additional context

/var/run/slurmdbd is created as part of installing the slurmdbd Debian package from the Ubuntu Archive.