systemd unit files for PostgreSQL on Debian/Ubuntu
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Each cluster is run as a separate service, called postgresql@version/name.
pg_ctlcluster is invoked with --skip-systemctl-redirect. Logging still goes to
/var/log/postgresql.

There is a parent service called postgresql.service, that starts/stops/restarts/
reloads all individual services that are configured as "auto" in
/etc/postgresql/*/*/start.conf.

The link between start.conf and postgresql.service is established by
postgresql-generator, which creates symlinks in
/run/systemd/generator/postgresql.service.wants/.

 -- Christoph Berg <myon@debian.org>  Fri, 18 Jul 2014 23:52:09 +0300