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I have nagios 3 running on Ubuntu 10.4 and I get a weird email sometimes.

** PROBLEM Host Alert: localhost is DOWN **

***** Nagios *****

Notification Type: PROBLEM Host: localhost State: DOWN Address: 127.0.0.1 Info: (Return code of 127 is out of bounds - plugin may be missing)

Date/Time: Thu Aug 19 15:00:43 EDT 2010

Today it happened at 9:00, 11:00, 13:00 and 15:00 exactly. So there must be something running at these times to cause it, but there's nothing weird in the root crontab and nothing at all in the nagios crontab. Additionally there's no error showing in the nagios website. Anyone see this before?

here's my localhost.cfg: http://friendpaste.com/6bkUfWfGVI93Z5caJo6uGS

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It sounds like it's saying it can't find the check_ping command (which is used to determine if the host is up or not). You're configuration is probably set to alert you every 2 hours, hence the timing.

What location does your checkcommands.cfg say the check_ping plugin is located? Check to see if it's there? Also, if you have a 64-bit machine, Nagios may be trying to look for the plugins under /usr/lib/nagios/plugins when it should be /usr/lib64/nagios/plugins

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  • I don't think that's it. I get alerts right when they error out and there are no errors in the web interface. That also means the plugins should be fine. Also, I'm running 32bit.
    – Matt Williamson
    Aug 19, 2010 at 22:22
  • Also there's no ping service for localhost
    – Matt Williamson
    Aug 19, 2010 at 22:23
  • What if you run the commands by hand? There should be a check-host-alive command defined somewhere. It usually looks like $USER1$/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 1 where $USER1$ is your plugins dir. Is this constantly going on, or just sporadically?
    – vmfarms
    Aug 20, 2010 at 0:37

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