[ClusterLabs] VirtualDomain & "deeper" monitors - what/how?

[Andrei Borzenkov]

On 30.04.2021 17:57, Ken Gaillot wrote:
> On Fri, 2021-04-30 at 11:00 +0100, lejeczek wrote:
>> Hi guys
>>
>> I'd like to ask around for thoughts & suggestions on any 
>> semi/official ways to monitor VirtualDomain.
>> Something beyond what included RA does - such as actual 
>> health testing of and communication with VM's OS.
>>
>> many thanks, L.
> 
> This use case led to a Pacemaker feature many moons ago ...
> 
> Pacemaker supports nagios plug-ins as a resource type (e.g.
> nagios:check_apache_status). These are service checks usually used with
> monitoring software such as nagios, icinga, etc.
> 

The documentation for it is rather short. In particular ...

> If the service being monitored is inside a VirtualDomain, named vm1 for
> example, you can configure the nagios resource with the resource meta-
> attribute container="vm1". If the nagios check fails, Pacemaker will
> restart vm1.
> 

... this is not documented anywhere.

Is there any howto, blog or whatever with example usage and configuration?

> (This feature was added before OS containers became popular, so the
> naming is a bit unfortunate.)
>