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Filename : postgresql@12-main.service
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# systemd service template for PostgreSQL clusters. The actual instances will
# be called "postgresql@version-cluster", e.g. "postgresql@9.3-main". The
# variable %i expands to "version-cluster", %I expands to "version/cluster".
# (%I breaks for cluster names containing dashes.)

[Unit]
Description=PostgreSQL Cluster %i
AssertPathExists=/etc/postgresql/%I/postgresql.conf
RequiresMountsFor=/etc/postgresql/%I /var/lib/postgresql/%I
PartOf=postgresql.service
ReloadPropagatedFrom=postgresql.service
Before=postgresql.service
# stop server before networking goes down on shutdown
After=network.target

[Service]
Type=forking
# -: ignore startup failure (recovery might take arbitrarily long)
# the actual pg_ctl timeout is configured in pg_ctl.conf
ExecStart=-/usr/bin/pg_ctlcluster --skip-systemctl-redirect %i start
# 0 is the same as infinity, but "infinity" needs systemd 229
TimeoutStartSec=0
ExecStop=/usr/bin/pg_ctlcluster --skip-systemctl-redirect -m fast %i stop
TimeoutStopSec=1h
ExecReload=/usr/bin/pg_ctlcluster --skip-systemctl-redirect %i reload
PIDFile=/run/postgresql/%i.pid
SyslogIdentifier=postgresql@%i
# prevent OOM killer from choosing the postmaster (individual backends will
# reset the score to 0)
OOMScoreAdjust=-900
# restarting automatically will prevent "pg_ctlcluster ... stop" from working,
# so we disable it here. Also, the postmaster will restart by itself on most
# problems anyway, so it is questionable if one wants to enable external
# automatic restarts.
#Restart=on-failure
# (This should make pg_ctlcluster stop work, but doesn't:)
#RestartPreventExitStatus=SIGINT SIGTERM

[Install]
WantedBy=multi-user.target