[Pacemaker] pacemaker + cman - node names and bind address

[Nikola Ciprich]

Hello Digimer,

and thanks for Your reply. I understand your points, but my question
is about something a bit different.. 

example: I have two nodes, node1 (lan address resolves to 192.168.1.1)
and node2 (lan address resolves to 192.168.1.2).
connected using crosslink (10.0.0.1, 10.0.0.2).

I'd like to use node1/node2 as cluster node names, but I'd like
to have node1/node2 resolving to 192.168.1.0 addresses but
cluster to communicate over 10.0.0.0 link.

In corosync, I was able to force this by setting bindnetaddr, but
how can I set this in cman cluster? (I (roughly) know that corosync
is used even in cman-based cluster, but this unimportant now, I think)

what is the clear way to achieve this?

thanks a lot in advance

BR

nik





On Thu, Dec 05, 2013 at 02:36:36AM -0500, Digimer wrote:
> On 05/12/13 02:28, Nikola Ciprich wrote:
> > Hello,
> > 
> > not sure whether this shouldn't be asked in some different
> > conference, if so, I'm sorry in advance..
> > 
> > Since this seems to be recommended solution for RHEL6 and since I
> > need to use CLVMD, I switched my cluster from corosync + pacemaker
> > to cman+pacemaker.
> > 
> > I usually use two-nodes clusters, where hostnames resolve to lan
> > uplink addresses, and nodes are interconnected using crosslink (to
> > be exact, multiple crosslinks with bonding).
> > 
> > I'd like to use hostnames as cluster node names, but I'd like
> > cluster communication to go over crosslinks. Is there a way I could
> > force this in cluster.conf?
> > 
> > cluster.conf manpage is quite brief on this..
> > 
> > Could somebody please give me an advice?
> > 
> > thanks a lot in advance
> > 
> > BR
> > 
> > nik
> 
> Hello,
> 
>   This list is fine to ask.
> 
>   I speak mainly as a cman user, but I will make an educated guess on
> the pacemaker side of things.
> 
>   First, cman does not replace corosync. Both pacemaker and cman use
> corosync for cluster communications and membership. The difference is
> that cman configures and starts corosync for you, behind the scenes.
> 
>   The node names you set in cluster.conf's "<clusternode
> name="an-c05n01.alteeve.ca" nodeid="1"> ... </clusternode>"
> (an-c05n01.alteeve.ca in this case) is resolved to an IP address. This
> IP address/subnet is then looked for of your network and, once found,
> the associated network card is used.
> 
>   Generally, it's advised that you set the cluster names to match each
> node's 'uname -n' hostname. If you did that, then the following bit of
> bash will tell you which interface will be used for the cluster (on
> RHEL/CentOS 6, anyway);
> 
> ifconfig |grep -B 1 $(gethostip -d $(uname -n)) | grep HWaddr | awk '{
> print $1 }'
> 
>   Once you've identified the network, you will want to make sure that,
> if it is bonded, it is a supported bond mode. Prior to 6.3 (iirc),
> only mode=1 (active/passive) bonding was supported. With 6.4, mode=0
> and mode=2 support was added. All other bond modes are not supported
> under corosync.
> 
>   As for pacemaker integration; Be sure to setup stonith in pacemaker
> and make sure it is working. Then use the 'fence_pcmk' fence agent in
> cluster.conf itself. This way, should cman detect a node failure, it
> will call pacemaker and ask it to fence the target node, saving you
> from having to keep the real fencing configured in two places at once.
> 
> hth
> 
> digimer
> 
> -- 
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
> 
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Ing. Nikola CIPRICH
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