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Man Pages
HASTMON(8) FreeBSD System Manager's Manual HASTMON(8)

hastmon
cluster monitoring daemon

hastmon [
-dFh
] [
-c config
] [
-P pidfile
]

The hastmon daemon monitors a resource (process, FS, etc) on several nodes. The resource can be active only on one machine. This machine is called primary.
There is one main hastmon daemon which starts new worker process as soon as a role for the given resource is changed to primary or watchdog or as soon as a role for the given resource is changed to secondary and remote (primary) node will successfully connect to it. Every worker process gets a new process title (see setproctitle(3)), which describes its role and resource it controls. The exact format is:
hastmon: <resource name> (<role>)
The connection between two hastmon daemons is initiated from the one running as primary to the one running as secondary. When primary hastmon is unable to connect or connection fails, it will try to re-establish connection every few seconds.
On start the hastmon daemon does not pick its role up automatically. The role has to be configured with the hastctl(8) control utility. Secondary can switch its role to primary if the following conditions are meat: there is no connection from primary and there are complaints from watchdog.
The hastmon daemon can be started with the following command line arguments:
config
Specify alternative location of the configuration file. The default location is /usr/local/etc/hastmon.conf.
Print or log debugging information. This option can be specified multiple times to raise the verbosity level.
Start the hastmon daemon in the foreground. By default hastmon starts in the background.
Print the hastmon usage message.
pidfile
Specify alternative location of a file where main process PID will be stored. The default location is /var/run/hastmon.pid.

/usr/local/etc/hastmon.conf
The configuration file for hastmon and hastmonctl(8).
/var/run/hastmonctl
Control socket used by the hastmonctl(8) control utility to communicate with hastmon.
/var/run/hastmon.pid
The default location of the hastmon PID file.

Exit status is 0 on success, or one of the values described in sysexits(3) on failure.

Launch hastmon on both nodes and start watchdog on third node. Set role for resource shared to primary on nodeA and to secondary on nodeB.
nodeB# hastmon 
nodeB# hastmonctl role secondary shared 
 
nodeA# hastmon 
nodeA# hastmonctl role primary shared 
 
nodeA# hastmon 
nodeA# hastmonctl role watchdog shared

hastmon.conf(5), hastmonctl(8).

The hastmon was developed by Mikolaj Golub ⟨to.my.trociny@gmail.com⟩.
October 20, 2010 FreeBSD 12.0-RELEASE

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