2.1. Requirements for installing repmgr

2.1.1. repmgr compatibility matrix
2.1.2. PostgreSQL 9.3 and 9.4 support

repmgr is developed and tested on Linux and OS X, but should work on any UNIX-like system supported by PostgreSQL itself. There is no support for Microsoft Windows.

repmgr 5.0.0 is compatible with all PostgreSQL versions from 9.3. See section repmgr compatibility matrix for an overview of version compatibility.

Note

If upgrading from repmgr 3.x, please see the section Upgrading from repmgr 3.x.

All servers in the replication cluster must be running the same major version of PostgreSQL, and we recommend that they also run the same minor version.

repmgr must be installed on each server in the replication cluster. If installing repmgr from packages, the package version must match the PostgreSQL version. If installing from source, repmgr must be compiled against the same major version.

Note

The same "major" repmgr version (e.g. 5.0.0.x) must be installed on all node in the replication cluster. We strongly recommend keeping all nodes on the same (preferably latest) "minor" repmgr version to minimize the risk of incompatibilities.

If different "major" repmgr versions (e.g. 4.1.x and 5.0.0.x) are installed on different nodes, in the best case repmgr (in particular repmgrd) will not run. In the worst case, you will end up with a broken cluster.

A dedicated system user for repmgr is not required; as many repmgr and repmgrd actions require direct access to the PostgreSQL data directory, these commands should be executed by the postgres user.

See also Prerequisites for configuration for information on networking requirements.

Tip

We recommend using a session multiplexer utility such as screen or tmux when performing long-running actions (such as cloning a database) on a remote server - this will ensure the repmgr action won't be prematurely terminated if your ssh session to the server is interrupted or closed.

2.1.1. repmgr compatibility matrix

The following table provides an overview of which repmgr version supports which PostgreSQL version.

Table 2.1. repmgr compatibility matrix

repmgr version Supported? Latest release Supported PostgreSQL versions
repmgr 5.x YES 5.0.0 (2019-10-15) 9.3, 9.4, 9.5, 9.6, 10, 11, 12
repmgr 4.x NO 4.4 (2019-06-27) 9.3, 9.4, 9.5, 9.6, 10, 11
repmgr 3.x NO 3.3.2 (2017-05-30) 9.3, 9.4, 9.5, 9.6
repmgr 2.x NO 2.0.3 (2015-04-16) 9.0, 9.1, 9.2, 9.3, 9.4

Important

The repmgr 2.x and 3.x series are no longer maintained or supported. We strongly recommend upgrading to the latest repmgr version.

Following the release of repmgr 5.0, there will be no further releases of the repmgr 4.x series. Note that repmgr 5.x is an incremental development of the 4.x series and repmgr 4.x users should upgrade to this as soon as possible.

2.1.2. PostgreSQL 9.3 and 9.4 support

Note that some repmgr functionality is not available in PostgreSQL 9.3 and PostgreSQL 9.4:

  • PostgreSQL 9.3 does not support replication slots, so corresponding repmgr functionality is not available.

  • In PostgreSQL 9.3 and PostgreSQL 9.4, pg_rewind is not part of the core distribution. pg_rewind will need to be compiled separately to be able to use any repmgr functionality which takes advantage of it.

Important

PostgreSQL 9.3 has reached the end of its community support period (final release was 9.3.25) and will no longer be updated with security or bugfixes.

PostgreSQL 9.4. is scheduled for its final release in February 2020 (see PostgreSQL Versioning Policy).

We recommend that users of these versions migrate to a recent PostgreSQL version as soon as possible.