[Unit]
Description=PostgreSQL database server
After=network.target

[Service]
Type=notify
TimeoutSec=120
User=postgres
Group=postgres

Environment=PGROOT=/var/lib/postgres

SyslogIdentifier=postgres
PIDFile=/var/lib/postgres/data/postmaster.pid
RuntimeDirectory=postgresql
RuntimeDirectoryMode=755

ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGROOT}/data
ExecStart=/usr/bin/postgres -D ${PGROOT}/data
ExecReload=/bin/kill -HUP ${MAINPID}
KillMode=mixed
KillSignal=SIGINT

# Due to PostgreSQL's use of shared memory, OOM killer is often overzealous in
# killing Postgres, so adjust it downward
OOMScoreAdjust=-200

# Additional security-related features
PrivateTmp=true
ProtectHome=true
ProtectSystem=full
NoNewPrivileges=true
ProtectControlGroups=true
ProtectKernelModules=true
ProtectKernelTunables=true
PrivateDevices=true
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
RestrictNamespaces=true
RestrictRealtime=true
SystemCallArchitectures=native

[Install]
WantedBy=multi-user.target