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Today's Topics:
1. Monitoring HA clusters (Chris Boot)
2. Re: Monitoring HA clusters (Antony Stone)
----------------------------------------------------------------------
Message: 1
Date: Thu, 31 May 2018 21:14:04 +0100
From: Chris Boot <li...@bootc.boo.tc>
To: icinga-users@lists.icinga.org
Subject: [icinga-users] Monitoring HA clusters
Message-ID: <9c24d89d-934d-f27b-7b22-b0d66a8fd...@bootc.boo.tc>
Content-Type: text/plain; charset=utf-8
Hi list,
In the old days of Nagios and NRPE, monitoring HA clusters was a simple
enough hack: declare a host that represents the services provided by the
cluster, assign a virtual IP address that floats with the services
(which you probably need to have anyway), then have Nagios prod NRPE on
the virtual address. Hey presto you're monitoring your services on
whichever node happens to be active.
With Icinga2 and its zones and endpoints, this doesn't work. Endpoints
are very specific hosts with SSL certificates, and they can't just
freely float between hosts.
Is there some way I can replicate this functionality without resorting
to NRPE?
Thanks,
Chris
--
Chris Boot
bo...@boo.tc
------------------------------
Message: 2
Date: Thu, 31 May 2018 23:12:06 +0200
From: Antony Stone <antony.st...@icinga.open.source.it>
To: "Icinga User's Corner" <icinga-users@lists.icinga.org>
Subject: Re: [icinga-users] Monitoring HA clusters
Message-ID: <201805312312.06828.antony.st...@icinga.open.source.it>
Content-Type: Text/Plain; charset="iso-8859-1"
On Thursday 31 May 2018 at 22:14:04, Chris Boot wrote:
> Hi list,
>
> In the old days of Nagios and NRPE, monitoring HA clusters was a simple
> enough hack: declare a host that represents the services provided by the
> cluster, assign a virtual IP address that floats with the services
> (which you probably need to have anyway), then have Nagios prod NRPE on
> the virtual address. Hey presto you're monitoring your services on
> whichever node happens to be active.
>
> With Icinga2 and its zones and endpoints, this doesn't work. Endpoints
> are very specific hosts with SSL certificates, and they can't just
> freely float between hosts.
>
> Is there some way I can replicate this functionality without resorting
> to NRPE?
1. I think you need to be careful to distinguish between *servers*, which you
want to monitor quite individually, the *services* running on each server,
which you might want to monitor with some dependencies to avoid false alerts
in the case of a service not running on a cluster machine in standby mode, and
the *cluster service* itself (which you monitor from outside the cluster, and
don't care which server is providing the service, so long as it responds).
Some clusters have one live machine and one hot standby; some have N servers
all running side-by side (distributed / load-balanced rather than master-slave
failover) where you want to be notified if fewer than X of the N servers are
actually operational; there are many different ways in which a "cluster" might
need to be monitored, depending on its architecture.
2. There is a "cluster-zone" Icinga2 check command, which may be what you need
(if you can find some sufficiently clear documentation about it; I think this
is
not easy).
3. The standard documentation for "High-Availability Master with Clients" at
https://www.icinga.com/docs/icinga2/latest/doc/06-distributed-monitoring/ may
be helpful - consider the clients as the same machines as the masters?
4. If all else fails, it's easy enough to reproduce NRPE functionality using
SSH :)
https://www.icinga.com/docs/icinga2/latest/doc/07-agent-based-monitoring/
I hope some of the above helps,
Antony.
--
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majority of people genuinely believe they are not like the majority of people.
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