[CentOS] Question about clustering

Mon Jun 16 09:39:00 UTC 2014
Alessandro Baggi <alessandro.baggi at gmail.com>

Hi Digimer,
there is a chance to make fencing without hardware, but only software?

Il 15/06/2014 17:28, Digimer ha scritto:
> On 15/06/14 08:54 AM, Alessandro Baggi wrote:
>> Another question is about fencing. I've ridden that a cluster must have
>> fencing to be considered as such. On CentOS 6.5 there is stonith that
>> concerns node level fencing. For this type of fencing I must have ilo,
>> ilom, drac, and other. It's possible to have fencing without Light-out
>> devices, blade power control device and other? There are other device
>> that can be used for fencing? Supposing a 2 node cluster with two server
>> assembled (no hp, dell, sun, ibm..) how I can implement fencing with
>> stonith? I can run a cluster without fencing and what implies do not use
>> fencing?
> A lot of odd problems go away once fencing is working. So this is a good
> time to sort this out, then go back and see if your problems remain.
> A very good way to fence machines without IPMI (etc) is to use an
> external switched PDU, like the APC AP7900 (or your country version on).
> http://www.apc.com/resource/include/techspec_index.cfm?base_sku=ap7900
> If your budget is tight, I have seen these models frequently go on sale
> for ~$200 (Canadian).
> These work be allowing another node to log into the PDU and turn off the
> power going to the lost/failed node. Please do note that the brand of
> switched PDU you buy matters. For a device to work for fencing, it must
> be possible for the cluster to talk to it. This is done using a "fence
> handler", and there are many types that are supported (APC, Eaton, etc).
> So if you want to get a different make/model, please first make sure
> there is a fence handler.
> Once you get this setup, see if your problems remain. If so, there is a
> good clustering mailing list at:
> https://www.redhat.com/mailman/listinfo/linux-cluster
> And if you're on freenode, #linux-cluster is also very good.
> Cheers!