Splitting web interface from the rest of nagios: Possible?
Andreas Ericsson
ae at op5.se
Thu Mar 3 09:08:56 CET 2005
Guy Waugh wrote:
> Greetings,
>
> I'm setting up nagios to run on one of the machines in my LVS cluster.
> My LVS cluster has two LVS directors (1 active, 1 redundant) and 8-10
> (varies) hosts within the cluster.
>
> I have installed nagios and nagios-plugins on one of my two database
> boxes within the cluster. This database box, among other things,
> NFS-exports a shared web document root to two load-balanced web servers
> (also within the LVS cluster). Hits to these two web servers are
> load-balanced by the active LVS director. Anyway...
>
> What I would like to do is run the nagios server on the database box,
> but serve the nagios web interface from both load-balanced web servers
> simultaneously (so that either web server can be taken offline without
> affecting any services). As the web document root is shared to both web
> servers from the database server, I can share files from the database
> server to both web servers, which makes me think that it should be
> possible to set up nagios in this fashion. I would then run nrpe (?) on
> each host in the cluster (including the web servers and the LVS
> directors) and poll them all from nagios on the database server.
>
> From my reading about nagios thus far, it appears that I would have to
> have the nagios CGI scripts available on both web servers, and that the
> CGI scripts would have to have access to the configuration and state
> information used by nagios. As far as I can see, I can set this up fine
> through NFS sharing.
>
> I'm wondering if this will work, however... can anyone see why it
> wouldn't work?
It should work.
> Does the nagios daemon have to be running on the same
> host that's serving the web interface?
No. That's just the most common setup.
> Any problems with file locking
> if, for example, the same CGI script running on both web servers wants
> to access the same file at the same time?
Possibly. Investigate Samba CIFS with spinlocks.
> Any other problems?
>
Not easily foreseeable.
> Thanks,
> Guy.
>
>
>
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--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Lead Developer
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