repmgr/doc/changes-in-repmgr4.md

Standardisation on primary

To standardise terminolgy, primary is used to denote the read/write node in a streaming replication cluster. master is still accepted as a synonym (e.g. repmgr master register).

New command line options

• --dry-run: repmgr will attempt to perform the action as far as possible without making any changes to the database

• --upstream-node-id: use to specify the upstream node the standby will connect later stream from, when cloning a standby. This replaces the configuration file parameter upstream_node, as the upstream node is set when the standby is initially cloned, but can change over the lifetime of an installation (due to failovers, switchovers etc.) so it's pointless/confusing keeping the original value around in the config file.

Changed command line options

repmgr

• --replication-user has been deprecated; it has been replaced by the configuration file option replication_user. The value (which defaults to the user in the conninfo string) will be stored in the repmgr metadata for use by standby clone/follow..

• --recovery-min-apply-delay is now a configuration file parameter `recovery_min_apply_delay, to ensure the setting does not get lost when a standby follows a new upstream.

repmgrd

• --monitoring-history is deprecated and has been replaced by the configuration file option monitoring_history. This enables the setting to be changed without having to modify system service files.

Changes to repmgr commands

repmgr cluster show

This now displays the role of each node (e.g. primary, standby) and its status in separate columns.

The --csv option now emits a third column indicating the recovery status of the node.

Configuration file changes

Required settings

The following 4 parameters are mandatory in repmgr.conf:

• node_id
• node_name
• conninfo
• data_directory

Renamed settings

Some settings have been renamed for clarity and consistency:

• node: now node_id

• name: now node_name

• master_reponse_timeout: now async_query_timeout to better indicate its purpose

• The following configuration file parameters have been renamed for consistency with other parameters (and conform to the pattern used by PostgreSQL itself, which uses the prefix log_ for logging parameters):

  • loglevel has been renamed to log_level
  • logfile has been renamed to log_file
  • logfacility has been renamed to log_facility

Removed settings

• cluster: has been removed
• upstream_node: see note about --upstream-node-id above.
• retry_promote_interval_secs: this is now redundant due to changes in the failover/promotion mechanism; the new equivalent is primary_notification_timeout

Logging changes

• default value for log_level is INFO rather than NOTICE.
• new parameter log_status_interval, which causes repmgrd to emit a status log line at the specified interval

repmgrd

The repmgr shared library has been renamed from repmgr_funcs to repmgr, meaning shared_preload_libraries needs to be updated to the new name:

shared_preload_libraries = 'repmgr'