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.. _pg_autoctl_enable_monitor:
pg_autoctl enable monitor
==========================
pg_autoctl enable monitor - Enable a monitor for this node to be orchestrated from
Synopsis
--------
It is possible to disable the pg_auto_failover monitor and enable it again
online in a running pg_autoctl Postgres node. The main use-cases where this
operation is useful is when the monitor node has to be replaced, either
after a full crash of the previous monitor node, of for migrating to a new
monitor node (hardware replacement, region or zone migration, etc).
::
usage: pg_autoctl enable monitor [ --pgdata --allow-failover ] postgres://autoctl_node@new.monitor.add.ress/pg_auto_failover
--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``.
Environment
-----------
PGDATA
Postgres directory location. Can be used instead of the ``--pgdata``
option.
PG_AUTOCTL_MONITOR
Postgres URI to connect to the monitor node, can be used instead of the
``--monitor`` option.
XDG_CONFIG_HOME
The pg_autoctl command stores its configuration files in the standard
place XDG_CONFIG_HOME. See the `XDG Base Directory Specification`__.
__ https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
XDG_DATA_HOME
The pg_autoctl command stores its internal states files in the standard
place XDG_DATA_HOME, which defaults to ``~/.local/share``. See the `XDG
Base Directory Specification`__.
__ https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
Examples
--------
::
$ pg_autoctl show state
Name | Node | Host:Port | LSN | Connection | Current State | Assigned State
------+-------+----------------+-----------+--------------+---------------------+--------------------
node1 | 1 | localhost:5501 | 0/4000760 | read-write | primary | primary
node2 | 2 | localhost:5502 | 0/4000760 | read-only | secondary | secondary
$ pg_autoctl enable monitor --pgdata node3 'postgres://autoctl_node@localhost:5500/pg_auto_failover?sslmode=require'
12:42:07 43834 INFO Registered node 3 (localhost:5503) with name "node3" in formation "default", group 0, state "wait_standby"
12:42:07 43834 INFO Successfully registered to the monitor with nodeId 3
12:42:08 43834 INFO Still waiting for the monitor to drive us to state "catchingup"
12:42:08 43834 WARN Please make sure that the primary node is currently running `pg_autoctl run` and contacting the monitor.
$ pg_autoctl show state
Name | Node | Host:Port | LSN | Connection | Current State | Assigned State
------+-------+----------------+-----------+--------------+---------------------+--------------------
node1 | 1 | localhost:5501 | 0/4000810 | read-write | primary | primary
node2 | 2 | localhost:5502 | 0/4000810 | read-only | secondary | secondary
node3 | 3 | localhost:5503 | 0/4000810 | read-only | secondary | secondary
|
