repmgr: Replication Manager for PostgreSQL

repmgr is a suite of open-source tools to manage replication and failover within a cluster of PostgreSQL servers. It enhances PostgreSQL's built-in replication capabilities with utilities to set up standby servers, monitor replication, and perform administrative tasks such as failover or switchover operations.

repmgr 4 is a complete rewrite of the existing repmgr codebase.

Supports PostgreSQL 9.6 and later; support for 9.3 has been dropped, 9.4/9.5 may be supported if feasible.

Building from source

Simply:

./configure && make install

Ensure pg_config for the target PostgreSQL version is in $PATH.

Commands

Currently available:

repmgr primary register
repmgr primary unregister

repmgr standby clone
repmgr standby register
repmgr standby unregister
repmgr standby promote
repmgr standby follow

repmgr cluster event [--all] [--node-id] [--node-name] [--event] [--event-matching]

Backwards compatibility

See also: doc/changes-in-repmgr4.md

repmgr is now implemented as a PostgreSQL extension. NOTE: no need to install the extension, this will be done automatically by repmgr primary register.

Metadata tables have been revised and are not backwards-compatible with 3.x. (however future DDL updates will be easier as they can be carried out via the ALTER EXTENSION mechanism.

TODO: extension upgrade script for pre-4.0

Some configuration items have had their names changed for consistency and clarity e.g. node => node_id. repmgr will issue a warning about deprecated/altered options.

Some configuration items have been changed to command line options, and vice-versa, e.g. to avoid hard-coding things like a node's upstream ID which might change.

TODO: possibly add a config file conversion script/function.