pg_autoctl config set

pg_autoctl config set - Set the value of a given pg_autoctl configuration variable

Synopsis

This command prints a pg_autoctl configuration setting:

usage: pg_autoctl config set  [ --pgdata ] [ --json ] section.option [ value ]

--pgdata      path to data directory

Options

--pgdata

Location of the Postgres node being managed locally. Defaults to the environment variable PGDATA. Use --monitor to connect to a monitor from anywhere, rather than the monitor URI used by a local Postgres node managed with pg_autoctl.

--json

Output JSON formated data.

Description

This commands allows to set a pg_autoctl configuration setting to a new value. Most settings are possible to change and can be reloaded online.

Some of those commands can then be applied with a pg_autoctl reload command to an already running process.

Settings

pg_autoctl.role

This setting can not be changed. It can be either monitor or keeper and the rest of the configuration file is read depending on this value.

pg_autoctl.monitor

URI of the pg_autoctl monitor Postgres service. Can be changed with a reload.

To register an existing node to a new monitor, use pg_autoctl disable monitor and then pg_autoctl enable monitor.

pg_autoctl.formation

Formation to which this node has been registered. Changing this setting is not supported.

pg_autoctl.group

Group in which this node has been registered. Changing this setting is not supported.

pg_autoctl.name

Name of the node as known to the monitor and listed in pg_autoctl show state. Can be changed with a reload.

pg_autoctl.hostname

Hostname or IP address of the node, as known to the monitor. Can be changed with a reload.

pg_autoctl.nodekind

This setting can not be changed and depends on the command that has been used to create this pg_autoctl node.

postgresql.pgdata

Directory where the managed Postgres instance is to be created (or found) and managed. Can’t be changed.

postgresql.pg_ctl

Path to the pg_ctl tool used to manage this Postgres instance. Absolute path depends on the major version of Postgres and looks like /usr/lib/postgresql/13/bin/pg_ctl when using a debian or ubuntu OS.

Can be changed after a major upgrade of Postgres.

postgresql.dbname

Name of the database that is used to connect to Postgres. Can be changed, but then must be changed manually on the monitor’s pgautofailover.formation table with a SQL command.

Warning

When using pg_auto_failover enterprise edition with Citus support, this is the database where pg_autoctl maintains the list of Citus nodes on the coordinator. Using the same database name as your application that uses Citus is then crucial.

postgresql.host

Hostname to use in connection strings when connecting from the local pg_autoctl process to the local Postgres database. Defaults to using the Operating System default value for the Unix Domain Socket directory, either /tmp or when using debian or ubuntu /var/run/postgresql.

Can be changed with a reload.

postgresql.port

Port on which Postgres should be managed. Can be changed offline, between a pg_autoctl stop and a subsequent pg_autoctl start.

postgresql.listen_addresses

Value to set to Postgres parameter of the same name. At the moment pg_autoctl only supports a single address for this parameter.

postgresql.auth_method

Authentication method to use when editing HBA rules to allow the Postgres nodes of a formation to connect to each other, and to the monitor, and to allow the monitor to connect to the nodes.

Can be changed online with a reload, but actually adding new HBA rules requires a restart of the “node-active” service.

postgresql.hba_level

This setting reflects the choice of --skip-pg-hba or --pg-hba-lan that has been used when creating this pg_autoctl node. Can be changed with a reload, though the HBA rules that have been previously added will not get removed.

ssl.active, ssl.sslmode, ssl.cert_file, ssl.key_file, etc

Please use the command pg_autoctl enable ssl or pg_autoctl disable ssl to manage the SSL settings in the ssl section of the configuration. Using those commands, the settings can be changed online.

replication.maximum_backup_rate

Used as a parameter to pg_basebackup, defaults to 100M. Can be changed with a reload. Changing this value does not affect an already running pg_basebackup command.

Limiting the bandwidth used by pg_basebackup makes the operation slower, and still has the advantage of limiting the impact on the disks of the primary server.

replication.backup_directory

Target location of the pg_basebackup command used by pg_autoctl when creating a secondary node. When done with fetching the data over the network, then pg_autoctl uses the rename(2) system-call to rename the temporary download location to the target PGDATA location.

The rename(2) system-call is known to be atomic when both the source and the target of the operation are using the same file system / mount point.

Can be changed online with a reload, will not affect already running pg_basebackup sub-processes.

timeout.network_partition_timeout

Timeout (in seconds) that pg_autoctl waits before deciding that it is on the losing side of a network partition. When pg_autoctl fails to connect to the monitor and when the local Postgres instance pg_stat_replication system view is empty, and after this many seconds have passed, then pg_autoctl demotes itself.

Can be changed with a reload.

timeout.prepare_promotion_catchup

Currently not used in the source code. Can be changed with a reload.

timeout.prepare_promotion_walreceiver

Currently not used in the source code. Can be changed with a reload.

timeout.postgresql_restart_failure_timeout

When pg_autoctl fails to start Postgres for at least this duration from the first attempt, then it starts reporting that Postgres is not running to the monitor, which might then decide to implement a failover.

Can be changed with a reload.

timeout.postgresql_restart_failure_max_retries

When pg_autoctl fails to start Postgres for at least this many times then it starts reporting that Postgres is not running to the monitor, which them might decide to implement a failover.

Can be changed with a reload.