__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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systemd unit files for PostgreSQL on Debian/Ubuntu
--------------------------------------------------
Each cluster is run as a separate service, called postgresql@version-cluster.
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/.
Backup
------
Two backup mechanisms are being offered as systemd services: basebackups
capable of point in time recovery (PITR, the preferred method), and SQL-level
dumps.
pg_basebackup@version-cluster.service
pg_basebackup@version-cluster.timer
Weekly basebackup in /var/backups/postgresql/version/cluster.
By default, 3 copies are being kept.
To enable, run
systemctl enable --now pg_basebackup@version-cluster.timer
systemctl start pg_basebackup@version-cluster.service
pg_receivewal@version-cluster.service
WAL archival to be used with pg_basebackup@.service for PITR.
To enable, run
systemctl enable --now pg_basebackup@version-cluster.timer pg_receivewal@version-cluster.service
systemctl start pg_basebackup@version-cluster.service
pg_dump@version-cluster.service
pg_dump@version-cluster.timer
Weekly SQL dump in /var/backups/postgresql/version/cluster.
By default, 3 copies are being kept.
To enable, run
systemctl enable --now pg_dump@version-cluster.timer
systemctl start pg_dump@version-cluster.service
The mechanisms provided are meant to be used with low to medium size databases.
For larger databases, or databases with high write volume, we advise to use a
full-size backup solution such as pgbackrest or barman.
-- Christoph Berg <myon@debian.org> Mon, 08 Mar 2021 13:45:26 +0100
