Nagios as a Service Resiliency Manager

[Christopher McAtackney]

That's an interesting link - but unfortunately I don't think it really
covers the situation where a host goes down or becomes unreachable. It
may be the case that Nagios is not suitable for this purpose, but I
thought I would check on here in case anyone had done anything like
this previously.

Cheers,
Chris

2009/12/10 Marcel <mitsuto at gmail.com>:
> Maybe this would help:
> http://onlamp.com/onlamp/2006/05/25/self-healing-networks.html
>
> On Thu, Dec 10, 2009 at 3:08 PM, Christopher McAtackney <cristoir at gmail.com>
> wrote:
>>
>> Hi all,
>>
>> I have a need to control an Active / Passive pair of components and
>> was wondering if anyone had tackled this problem with Nagios?
>>
>> The scenario is as follows;
>>
>> Host A has SERVICE_1 installed and running. Host B has SERVICE_2
>> installed, but not running.
>>
>> The desired functionality is to detect when SERVICE_1 is not running
>> (or that Host A is down / unreachable), and then to start SERVICE_2 on
>> Host B.
>>
>> I believe I can do this with Nagios by defining an event handler on
>> SERVICE_1 which will make the appropriate call to start SERVICE_2 on
>> Host B
>>
>> Would it make sense to store the relationship between SERVICE_1 and
>> Host B / SERVICE_2 as a service macro, e.g.
>> $_SERVICE_PASSIVE_HOSTNAME, $_SERVICE_PASSIVE_SERVICENAME?
>>
>> There are too many scenarios in which the SERVICE_1 might come back up
>> to try automate the switching off of SERVICE_2 I believe, e.g. if
>> someone pulled a network cable on Host A accidently, then plugged it
>> in 15 minutes later - during which time Nagios detects that it is down
>> and so starts up SERVICE_2. The user then plugs the network lead back
>> in and now we have two Active instances running - which is what we
>> specifically wanted to avoid. Even if Nagios detects that the primary
>> component is up, it's still too late because any Active / Active
>> overlap will cause problems for this particular application.
>>
>> I can't think of any way to automate that side of things - but does
>> the general concept of having Nagios start up a Passive partner make
>> sense?
>>
>> Thanks for any insight you have,
>>
>> Chris
>>
>>
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