[rabbitmq-discuss] Release of HA + Pacemaker guide

[Joe Healy]

Apologies there - a quick read and I missed the colocation part.

Thanks,

Joe


On Mon, Apr 26, 2010 at 11:59 PM, Matthew Sackman <matthew at lshift.net>wrote:

> Hi Joe,
>
> On Mon, Apr 26, 2010 at 11:48:12PM +1000, Joe Healy wrote:
> > Thanks - this is a great guide for ha rabbit.
>
> Good to hear!
>
> > We've been using a similar set up for a couple of months with iscsi
> instead
> > of drdb.
>
> Yup. I was simply using drbd because it's pretty much the lowest common
> denominator - (e)nbd would also be possible (over RAID 1), but that's
> more fiddly. iscsi / NAS / SAN and such ilk would, I'd expect, give
> better results.
>
> > Do you need to add resource grouping or colocation to the bunny and ip
> > resources to make sure that they move together? Is it important that the
> ip
> > migrates before the bunny starts so that it will listen on the right
> > address?
>
> Yes and yes:
>
> "crm(ip)# configure primitive ip ocf:heartbeat:IPaddr2 params
> ip="192.168.50.1" cidr_netmask="24"
> crm(ip)# configure colocation bunny_on_ip inf: bunny ip
> crm(ip)# configure order bunny_after_ip inf: ip bunny
>
> This should all be looking rather familiar by now. We create the ip
> resource, we say that the bunny resource must run on the same node as
> the ip resource, and we make sure that the bunny resource is started
> after, and stopped before, the ip resource."
>
> These are necessary steps - sure, you could have bunny just listen on
> 0.0.0.0 which is the default, but if the network i/f isn't there when it
> starts then there may be problems. I'm not quite sure what the IPaddr2
> script is doing, but it's clearly at least slightly magic - the
> interface doesn't show up in the output of ifconfig. In general, I found
> things more reliable if the IP address is already there before bunny
> starts up.
>
> Matthew
>
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