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| -rw-r--r-- | systemd/README.systemd | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/systemd/README.systemd b/systemd/README.systemd new file mode 100644 index 0000000..c818ad3 --- /dev/null +++ b/systemd/README.systemd @@ -0,0 +1,55 @@ +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 |