The pain of Nagios and Arch Linux

Or, there’s more to systemd than just service files.

I recently had cause to investigate writing a simple Nagios http monitor and although I’ve worked in and around Nagios I’ve not really had cause to try writing the monitor scripts.

There was an aspect of the task I wasn’t too sure about so I thought the best way to get to grips with fully understanding  the environment would be to try and get Nagios running on my desktop system.

Moral of the story: there’s a reason why Arch will never be used in an enterprise environment.

First, I should have been warned off by seeing that nagios for Arch only comes via the AUR.

But, there’s a reasonably detailed page describing it. The real problems came with nginx, php-fpm and fastcgi.

The php-fpm service isn’t enabled or started by default: systemctl soon fixes that.

For some bizarre reason, it turned out that although nginx had been configured to use /usr/share/nagios/share and the root directory for PHP scripts, it was trying to access PHP scripts in /etc/nginx/html/nagios. I had to cheat here and just created a symbolic link between the directories which got the basic page displaying.

But then to get the CGI scripts running I had to look more closely at the Arch nginx configuration for fcgiwrap and having seen that the fcgiwrap service wouldn’t run, I finally twigged that nginx was referring to a .sock file and that there was a systemd socket file.

So I now have Nagios running on Arch. Mostly.

Tomorrow I need to figure out the cause of these errors:

Error: Could not read object configuration data!

But at least we’re now dealing with Nagios problems rather than Arch.


Places of interest


2 thoughts on “The pain of Nagios and Arch Linux

  1. julianrawcliffe Post author

    And after starting the Nagios service it was necessary to add the http user (as runner of nginx process) to the nagios group and change the mode of /var/nagios/rw to 0775 (although there’s possibly an argument for making it 1775).


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