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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