[Linux-cluster] RHCS

Gordan Bobic gordan at bobich.net
Tue Nov 3 13:31:50 UTC 2009

Sreeharsha Totakura wrote:
> Hi,
> I am using RHCS 5.2 for achieving High Availability in MySQL database
> service. I have configured two nodes; one as a primary and the other as a
> backup. Both the servers have GFS on SAN.
> The cluster suite is configured properly and when a node shuts down, the
> service is being started in the other node with the configured virtual ip
> address for MySQL service. However, if we plug out the network link to the
> primary server the service is not being started in the other node; even
> after having 'monitor_link="1"' in cluster.conf for that virtual ip
> address.
> Our servers are connected by redundant SAN connections so we have 6 network
> interfaces on both the servers. I feel the nodes are still able to
> communicate through these network connections which are being used for SAN
> volumes. Is there anyway in which I can configure cluster manager to bind
> the virtual ip for MySQL service to an interface and monitor the link on
> that interface?

The virtual IP will always be assigned to the interface with the static 
IP on the same subnet.

i.e. if you have an interface eth0 on, and the floating IP 
is, it'll automatically go to the eth0 interface. Is this not 
what is happening in your setup? I think link monitoring should be on 
the static, rather than floating IP resource (that's what I do, and it 
works for me).


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