NRDS and Event Handlers

[blariv]

I cannot seem to get this to work and I'm sure it is even supported. Remote Linux passive disk checks w/ NRDS and trying to run a logrotate event handler.

Do i need to have active checks to trigger the handler?

command[Check Disk]=/usr/local/nagios/libexec/check_disk -w 10% -c 5% -p /
$USER1$/check_nrpe -H $HOSTADDRESS$ -c "/usr/sbin/logrotate -f /etc/logrotate.conf"

CentOS release 6.3 (Final)
Nagios XI Version : 2012R2.7

Thanks!

[lmiltchev]

This should work but it will require some work.

1. First, make sure you can run "logrotate" as nagios user.

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su nagios
sudo /usr/sbin/logrotate -f /etc/logrotate.conf

Most probably, you will need to modify the "/etc/sudoers" to make this work. I was running XI on my remote machine, so I added the following two lines:

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NAGIOSXI ALL = NOPASSWD: /usr/sbin/logrotate *
NAGIOSXIWEB ALL = NOPASSWD: /usr/sbin/logrotate *

2. Setup a command in the "/usr/local/nagios/etc/nrpe/common.cfg" or "/usr/local/nagios/etc/nrpe.cfg", depending on how you installed NRPE.

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command[logrotate]=sudo /usr/sbin/logrotate -f /etc/logrotate.conf

Restart xinetd (or NRPE if it's running as a standalone daemon) so that changes can take effect.

Note: If you test this command from the CLI on the Nagios XI server, you will get an error, because there is no output that is returned.

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[root@localhost tmp]# /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -c logrotate
NRPE: Unable to read output

Don't worry about it - you can temporarily change your command to this:

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command[logrotate]=sudo /usr/sbin/logrotate -f /etc/logrotate.conf;echo "Logs rotated"

just for testing purposes.

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[root@localhost tmp]# /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -c logrotate
Logs rotated

3. Create a command to be used as an event handler, for example:

example01.PNG

4. Modify your "disk" service to use the event handler.

example02.PNG

5. Double check the host config for the "disk" service to make sure the "Address" filed contains a valid IP address. As this is a passive check, you may have a name in the address filed, which will cause the "$HOSTADDRESS$" macro not to resolve.

Hope this helps. Let us know if you run into some issues.