About a active plugin in local machine

[Andreas Ericsson]

Harlan Richard C wrote:
> Like I said before I have not problem with distributed monitoring. I
> know they use passive checks back to main Nagios Host. The problem I
> have is for a critical peace of infrastructure is relying on the passive
> check to the Host. I prefer active check. The problem with passive check
> is you are relaying on the host to update Nagios instead of Nagios
> actively polling for information. Like you said below I know if the data
> becomes stale Nagios will fore a check on the service. I just prefer to
> cut the middle man out of the system and reline on active checks.
> 

A matter of opinion then. Perhaps this part of the discussion can be 
dropped.

> Over all Nagios will scale to a very large amount of active service
> check in a short amount of time. For the most part most check take very
> little system recourses, but the problem becomes you can only do some
> many checks in a set time frame. 
> 

This depends largely on the type of checks being run. It's very 
expensive to dig through logfiles, and very cheap to run a local plugin 
making a single system call (sysinfo() on linux, f.e.). Interpreted 
plugins (scripts) always run slower and require more memory than their 
compiled counterpart. Plugins executing external programs also run a lot 
slower. SNMP-plugins parsing a lot of mibs will run significantly slower 
than those using OID's and not parsing the mibs (I think Net::SNMP of 
perl parses all mibs automagically, so executing snmpget without parsing 
mibs is actually faster when using perl).

In healthy networks where things work most of the time, plugins will run 
a lot faster (since no plugins time out) and Nagios will be able to 
handle more active checks.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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