Adding Services to Chksrvd for Monitoring
Posted by Vanessa | Tagged under management,monitoring,tricks,whm | Posted on December 28, 2009
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Chkservd is the service in cPanel that checks to make sure that services are running, then restarts them if necessary. It’s also responsible for the ‘Service Manager’ section in cPanel, which is also an interface where added services can be easily checked on and off.
Service files are in /etc/chkserv.d/
To add a new service, create a line in ”’/etc/chkserv.d/chkservd.conf’” in the same format as the others:
service:1
1 means the service should be enabled, 0 means it’s off.
In ”’/etc/chkserv.d”’ each service has its own file. Create a file called as the name of the service you are monitoring. The contents of the file are in the format of:
#SERVICE = PORT, SEND, RESPONSE, RE-START COMMAND
There are two ways that cPanel checks services with chkservd:
*Connection-based monitoring – By default, cPanel will try to connect to the service’s specified port, issue a command, and if a response is received within 10 seconds it will consider the service to be online. For instance, FTP:
service[ftpd]=21,QUIT,220,/scripts/restartsrv_ftpserver
*Process-based monitoring – cPanel will check for a specific process to determine whether it is online. For instance, named:
service[named]=x,x,x,/scripts/restartsrvr_bind,named,named|bind
If you have more than one restart command, you can separate them with semicolons in order of preference that they should be run. Output of these commands will be logged to the chkservd.log
After you’ve created the service’s configuration file, restart chkservd:
/etc/init.d/chkservd restart
You should then see the service listed in WebHost Manager in the ‘service manager section’
Chkservd logs are in /var/log/chkservd.log. Checks are done every 8 minutes, and everyone online service gets a +, offline services get a -. If the service is determined to be offline, the restart command(s) specified in that service’s chkservd configuration file is issued and the output is logged.
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