Upgrading from repmgr 3

The upgrade process consists of two steps:

1) converting the repmgr.conf configuration files
2) upgrading the repmgr schema.

Scripts are provided to assist both with converting repmgr.conf and upgrading the schema.

Converting repmgr.conf configuration files

With a completely new repmgr version, we've taken the opportunity to rename some configuration items have had their names changed for clarity and consistency, both between the configuration file and the column names in repmgr.nodes (e.g. node → node_id), and also for consistency with PostgreSQL naming conventions (e.g. loglevel → log_level).

Other configuration items have been changed to command line options, and vice-versa, e.g. to avoid hard-coding items such as a a node's upstream ID, which might change oer time.

repmgr will issue a warning about deprecated/altered options.

Changed parameters

Following parameters have been added:

- `data_directory`: this is mandatory and must contain the path
    to the node's data directory
- `monitoring_history`: this replaces the `repmgrd` command line
    option `--monitoring-history`

Following parameters have been renamed:

- `node` → `node_id`
- `loglevel` → `log_level`
- `logfacility` → `log_facility`
- `logfile` → `log_file`
- `master_reponse_timeout` → `async_query_timeout`

Following parameters have been removed:

- `cluster` is no longer required and will be ignored.
- `upstream_node_id` is replaced by the command-line parameter
     `--upstream-node-id`

Conversion script

To assist with conversion of repmgr.conf files, a Perl script is provided in contrib/convert-config.pl. Use like this:

$ ./convert-config.pl /etc/repmgr.conf
node_id=2
node_name=node2
conninfo=host=localhost dbname=repmgr user=repmgr port=5602
pg_ctl_options='-l /tmp/postgres.5602.log'
pg_bindir=/home/barwick/devel/builds/HEAD/bin
rsync_options=--exclude=postgresql.local.conf --archive
log_level=DEBUG
pg_basebackup_options=--no-slot
data_directory=

The converted file is printed to STDOUT and the original file is not changed.

Please note that the parameter data_directory must be provided; if not already present, the conversion script will add an empty placeholder parameter.

Upgrading the repmgr schema

Ensure repmgrd is not running, or any cronjobs which execute the repmgr binary.

Install repmgr4; any repmgr3 packages should be uninstalled (if not automatically installed already).

Manually create the repmgr extension

In the database used by the existing repmgr configuration, execute:

CREATE EXTENSION repmgr FROM unpackaged;

This will move and convert all objects from the existing schema into the new, standard repmgr schema.

Note

there must be only one schema matching 'repmgr_%' in the database, otherwise this step may not work.

Re-register each node

This is necessary to update the repmgr metadata with some additional items.

On the primary node, execute e.g.

repmgr primary register -f /etc/repmgr.conf --force

On each standby node, execute e.g.

repmgr standby register -f /etc/repmgr.conf --force

Check the data is updated as expected by examining the repmgr.nodes table; restart repmgrd if required.

The original repmgr_$cluster schema can be dropped at any time.

Tip

If you don't care about any data from the existing repmgr installation, (e.g. the contents of the events and monitoring tables), the manual "CREATE EXTENSION" step can be skipped; just re-register each node, starting with the primary node, and the repmgr extension will be automatically created.

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