Opinions on load balancing and failover mechanisms

Sven Nierlein Sven.Nierlein at consol.de
Thu Jan 26 00:31:23 CET 2012


Hi Mike,

Mod-Gearman is more or less the successor of DNX and probably the fastest worker available at the moment. It has hostgroup/servicegroup affinity included as well as embedded perl support. It is high available with automatic loadbalancing when you setup at least 2 worker per network segment. But Mod-Gearman has a central configuration/scheduling. So when all master are down/unreachable, no checks are done.
Merlin is the only addon capable for multimaster setups.

I would try Merlin for a Multi-Master with Mod-Gearman worker but i never tried that. I usually use only Mod-Gearman with a single Master and vmware/veritas/heartbeat/whatever failover solution.

All this applys to the Nagios opensource version. I cannot say anything about Nagios XI.

Bye,
  Sven


On 1/25/12 23:44, Mike Lindsey wrote:
> There are a lot of options..  DNX, Merlin, mod_gearman to name a few...
> I could read the docs (and have read a good portion of some of them) and
> could implement test environments (and will eventually need to) but
> first I want opinions from people who've done this at large scale.
>
> I need to improve on our load distribution and failover mechanisms.
> Right now worker node outages are handled through freshness checking,
> and master node outages are handled through a load balanced vip and some
> fancy cron jobs that kick up a cold spare.
>
> What are the better options for local load distribution and geographic
> master failover?  Which options will better handle thousands of servers
> across a dozen colos, in half a dozen countries, when the goal is that
> no single host (or colo!) going offline can be allowed to have an effect
> on any other subset of the infrastructure?  Which options should I avoid?
>
> Currently running Nagios Core 3.2.1 with NSCA 2.9 on mostly FreeBSD
> systems.  Soon that should be Core 3.3, with XI on top, plus whatever
> load distribution mechanism wins the dog fight.

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