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WIP: Start, stop, and supervise gwcelery with systemd

Closed WIP: Start, stop, and supervise gwcelery with systemd
leo-singer/gwcelery:systemd into main
Closed Leo Pound Singer requested to merge leo-singer/gwcelery:systemd into main
  1. Sep 28, 2021
    • Leo Pound Singer's avatar
      WIP: Start, stop, and supervise gwcelery with systemd · f68f6754
      Leo Pound Singer authored 
      Provide support for starting, stopping, and supervising GWCelery
using systemd, the service manager for Linux. Systemd is present
on many Linux systems including apparently all LDG cluster nodes
and is responsible for bootstrapping userspace and bringing up
system services.

The main advantage of using systemd instead of the existing
htcondor technique is systemd can stop and restart the components
of GWCelery in the proper sequence to minimize downtime and reduce
the chances of losing in-flight tasks.

See the file systemd/README.rst included in this patch for
instructions.
      f68f6754