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HASTMON(8) System Manager's Manual HASTMON(8) NAME hastmon -- cluster monitoring daemon SYNOPSIS hastmon [-dFh] [-c config] [-P pidfile] DESCRIPTION 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-es- tablish 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 argu- ments: -c config Specify alternative location of the configuration file. The default location is /usr/local/etc/hastmon.conf. -d Print or log debugging information. This option can be specified multiple times to raise the verbosity level. -F Start the hastmon daemon in the foreground. By default hastmon starts in the background. -h Print the hastmon usage message. -P pidfile Specify alternative location of a file where main process PID will be stored. The default location is /var/run/hastmon.pid. FILES /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 Exit status is 0 on success, or one of the values described in sysexits(3) on failure. EXAMPLES 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 SEE ALSO hastmon.conf(5), hastmonctl(8). AUTHORS The hastmon was developed by Mikolaj Golub <to.my.trociny@gmail.com>. FreeBSD Ports 14.quarterly October 20, 2010 HASTMON(8)
NAME | SYNOPSIS | DESCRIPTION | FILES | EXIT STATUS | EXAMPLES | SEE ALSO | AUTHORS
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