ltcluster node service — show or execute the system service command to stop/start/restart/reload/promote a node
Shows or executes the system service command to stop/start/restart/reload a node.
This command is mainly meant for internal ltcluster usage, but is useful for confirming the command configuration.
--dry-run
Log the steps which would be taken, including displaying the command which would be executed.
--action
The action to perform. One of start
, stop
,
restart
, reload
or promote
.
If the parameter --list-actions
is provided together with
--action
, the command which would be executed will be printed.
--list-actions
List all configured commands.
If the parameter --action
is provided together with
--list-actions
, the command which would be executed for that
particular action will be printed.
--checkpoint
Issue a CHECKPOINT
before stopping or restarting the node.
Note that a superuser connection is required to be able to execute the
CHECKPOINT
command.
-S
/--superuser
Connect as the named superuser instead of the normal ltcluster user.
One of the following exit codes will be emitted by ltcluster node service
:
SUCCESS (0)
No issues were detected.
ERR_LOCAL_COMMAND (5)
Execution of the system service command failed.
See what action would be taken for a restart:
[lightdb@node1 ~]$ ltcluster -f /etc/ltcluster/12/ltcluster.conf node service --action=restart --checkpoint --dry-run INFO: a CHECKPOINT would be issued here INFO: would execute server command "sudo service lightdb-12 restart"
Restart the LightDB instance:
[lightdb@node1 ~]$ ltcluster -f /etc/ltcluster/12/ltcluster.conf node service --action=restart --checkpoint NOTICE: issuing CHECKPOINT DETAIL: executing server command "sudo service lightdb-12 restart" Redirecting to /bin/systemctl restart lightdb-12.service
List all commands:
[lightdb@node1 ~]$ ltcluster -f /etc/ltcluster/12/ltcluster.conf node service --list-actions Following commands would be executed for each action: start: "sudo service lightdb-12 start" stop: "sudo service lightdb-12 stop" restart: "sudo service lightdb-12 restart" reload: "sudo service lightdb-12 reload" promote: "/usr/pgsql-12/bin/lt_ctl -w -D '/var/lib/pgsql/12/data' promote"
List a single command:
[lightdb@node1 ~]$ ltcluster -f /etc/ltcluster/12/ltcluster.conf node service --list-actions --action=promote /usr/pgsql-12/bin/lt_ctl -w -D '/var/lib/pgsql/12/data' promote