Error: Could not stat() command file ‘/var/lib/nagios3/rw/nagios.cmd’!

How to
Error: Could not stat() command file '/var/lib/nagios3/rw/nagios.cmd'! The external command file may be missing, Nagios may not be running, and/or Nagios may not be checking external commands. An error occurred while attempting to commit your command for processing. Return from whence you came   Just do the following [code highlight="1,3,4,6"]root@nagios:~# ls -l /var/lib/nagios3/rw/nagios.cmd prw-rw---- 1 nagios nagios 0 Aug 11 22:27 /var/lib/nagios3/rw/nagios.cmd root@nagios:~# chmod -R g+x /var/lib/nagios3/rw root@nagios:~# ls -l /var/lib/nagios3/rw/nagios.cmd prw-rwx--- 1 nagios nagios 0 Aug 11 22:27 /var/lib/nagios3/rw/nagios.cmd root@nagios:~# service nagios3 restart[/code] Also change group of the file [code highlight="1,3"]root@nagios:~# ls -l /var/lib/nagios3/rw/nagios.cmd prw-rw---- 1 nagios nagios 0 Aug 11 22:27 /var/lib/nagios3/rw/nagios.cmd root@nagios:~# chown nagios:www-data /var/lib/nagios3/rw/nagios.cmd[/code] And also, you may need to do the following and restart apache afterwards [code highlight="1,2"]root@nagios:~# usermod -G nagios www-data root@nagios:~# service apache2…
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NAGIOS 3 with notifications on twitter

Experiments, How to, Linux, OpenSource, Resources, Social Networking, Tips and Tricks, Tutorials, Virtual Private Server
I have been experimenting with NAGIOS3 on Ubuntu (I will write a how-to-install on NAGIOS later) and it has served me very good in monitoring my 7 VPS from different providers in different part of the world. I have already recorded 3 hours of downtime from ThrustVPS which is a great deal for me. I now know which VPS has the best time and which ones have hiccups (e.g. my 2Host VPS gave me two unreachable notifications but the VPS was running and still reports the uptime as 4 days). Since I use twitter more, even when Im on the road, notifications via email is a bit slow for me. Luckily I found a great tutorial online to do that. (more…)
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