[Pacemaker] CMAN with multiple networks for HA communication

Digimer lists at alteeve.ca
Thu Jun 19 10:20:09 EDT 2014

On 19/06/14 08:00 AM, Teerapatr Kittiratanachai wrote:
> Dear List,
> According to CMAN identify each node in cluster by hostname.
> So I configure the IP address in /etc/hosts file as below.
> ...
>    node00.example.com
>    node01.example.com
> ...
> So the corosync member show as below
> [root at node00 ~]# corosync-objctl | grep member
> runtime.totem.pg.mrp.srp.members.2.ip=r(0) ip(
> runtime.totem.pg.mrp.srp.members.2.join_count=1
> runtime.totem.pg.mrp.srp.members.2.status=joined
> runtime.totem.pg.mrp.srp.members.1.ip=r(0) ip(
> runtime.totem.pg.mrp.srp.members.1.join_count=1
> runtime.totem.pg.mrp.srp.members.1.status=joined
> My question is, is it possible to add more than one network for the HA
> communicate between these nodes?
> e.g. if is down. And another network, which be main
> access network, still be up. the HA will use UP network to talk
> instead of the down one.
> Thank you in advance.
> Regards,
> Teerapatr Kittiratanachai (Te)

You're asking about setting up corosync's redundant ring protocol, 
correct? If so, yes. You can use cman's 'altname' element to add a 
second name for the node, and then have that name resolve to the network 
you want to use as the backup link.

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