[Pacemaker] Configuring 3rd Node as Quorum Node in 2 Node Cluster

[Andrew Beekhof]

On Wed, Jan 11, 2012 at 3:30 AM, Andrew Martin <amartin at xes-inc.com> wrote:
> Hello,
>
> I am creating a 2 node active/passive cluster for a fileserver (NFS and
> Samba) using DRBD + Heartbeat + Pacemaker on Ubuntu 10.04 following this
> guide: http://www.linbit.com/fileadmin/tech-guides/ha-nfs.pdf. I'd like to
> enable quorum and STONITH to ensure data integrity. Thus I want to configure
> a 3rd node that does not have DRBD, nfsd, or smbd installed but is just used
> to provide quorum (and ensure that the master node is connected to the rest
> of the network). I found a brief description of how to do this at the link
> below, however I'm not clear on all of the steps involved:
> http://www.gossamer-threads.com/lists/linuxha/pacemaker/72985#72985
>
> My understanding is that these steps are required:
> 1. install heartbeat on the 3rd node, node3. Does it have to be the exact
> same version of heartbeat (this node is running CentOS 5.6)?

Ideally yes.

> 2. copy the ha.cf and authkeys configuration files to node3

yep

> 3. Limit the DRBD, nfs, and smbd resources to only node1 and node2 by adding
> a location rule for the g_nfs group (which includes p_fs_drbd0
> p_lsb_nfsserver p_exportfs_drbd0 p_ip_nfs):
> # crm configure location ms-drbd0-placement ms-drbd0 rule -inf: uname ne
> node1 and uname ne node2

Right.

> Is there anything else that needs to be done to add this 3rd quorum node to
> the cluster?

Depending on the pacemaker version, you may need to make sure all the
agents are present on the third node (we'll use them to check the
services are /not/ running)