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Full Discussion: My "Bread and Butter" Process Keep Alive Perl Script....
Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials My "Bread and Butter" Process Keep Alive Perl Script.... Post 60062 by Neo on Saturday 8th of January 2005 04:17:38 AM
Old 01-08-2005
My "Bread and Butter" Process Keep Alive Perl Script....
For the newbies, I should have posted this years ago....

Here is the standard (tiny) "bread and butter" perl script (on Linux) I use in my crontab files to insure key processes are alive ( just in case ! ) like httpd, named, sshd, etc.

The example below if for named......

Code:
#!/usr/bin/perl

open(PS,"/bin/ps x|") || die "Can't Open PS";
while(<PS>) {
if (/usr\/sbin\/named/) { close PS; exit;}
}
close PS;
system("/usr/sbin/named");

One of my biggest "server fears" is that named will die for some strange reason, so I feel safe knowing that named is always running with the script above.

New Linux/UNIX users might find it useful.
 

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LEARN ABOUT CENTOS

ocf_heartbeat_named

OCF_HEARTBEAT_NAMED(7)						OCF resource agents					    OCF_HEARTBEAT_NAMED(7)

NAME

       ocf_heartbeat_named - Manages a named server

SYNOPSIS

       named [start | stop | status | monitor | meta-data | validate-all]

DESCRIPTION

       Resource script for named (Bind) server. It manages named as an HA resource.

SUPPORTED PARAMETERS

       named
	   Path to the named command.

	   (optional, string, default "/usr/sbin/named")

       rndc
	   Path to the rndc command.

	   (optional, string, default "/usr/sbin/rndc")

       host
	   Path to the host command.

	   (optional, string, default "/usr/bin/host")

       named_user
	   User that should own named process.

	   (optional, string, default "named")

       named_config
	   Configuration file for named.

	   (unique, optional, string, no default)

       named_pidfile
	   PIDFILE file for named.

	   (unique, optional, string, default "/var/run/named/named.pid")

       named_rootdir
	   Directory that named should use for chroot if any.

	   (unique, optional, string, no default)

       named_options
	   Options for named process if any.

	   (optional, string, no default)

       named_keytab_file
	   named service keytab file (for GSS-TSIG).

	   (optional, string, no default)

       monitor_request
	   Request that shall be sent to named for monitoring. Usually an A record in DNS.

	   (optional, string, default "localhost")

       monitor_response
	   Expected response from named server.

	   (optional, string, default "127.0.0.1")

       monitor_ip
	   IP Address where named listens.

	   (optional, string, default "127.0.0.1")

SUPPORTED ACTIONS

       This resource agent supports the following actions (operations):

       start
	   Starts the resource. Suggested minimum timeout: 60.

       stop
	   Stops the resource. Suggested minimum timeout: 60.

       reload
	   Suggested minimum timeout: 60.

       status
	   Performs a status check. Suggested minimum timeout: 10.

       monitor
	   Performs a detailed status check. Suggested minimum timeout: 30. Suggested interval: 30.

       meta-data
	   Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5.

       validate-all
	   Performs a validation of the resource configuration. Suggested minimum timeout: 5.

       methods
	   Suggested minimum timeout: 5.

EXAMPLE

       The following is an example configuration for a named resource using the crm(8) shell:

	   primitive p_named ocf:heartbeat:named 
	     op monitor depth="0" timeout="30" interval="30"

SEE ALSO

       http://www.linux-ha.org/wiki/named_(resource_agent)

AUTHOR

       Linux-HA contributors (see the resource agent source for information about individual authors)

resource-agents UNKNOWN 					    06/09/2014						    OCF_HEARTBEAT_NAMED(7)
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