I am running two node active/passive cluster running Centos3 update 8 64 bit on Hp Box with external hp storage connected via scsi. My cluster was running fine for last 3 years.But all of a sudden cluster service keep on shifting (atleast one time in a day )form one node to another.
After analysed the syslog i found that due to some network fluctuation service was getting shifted.Both the nodes has two NIC bonded together and configured with below ip.
My network details:
192.168.1.2 --node 1 physical ip with class c subnet (bond0 ) 192.168.1.3 --node 2 physical ip with class c subnet (bond0 ) 192.168.1.4 --- floating ip ( cluster )
Since it is a very critical and busy server may be due to heavy network load some hear beat signal is getting missed resulting in shifting of service from one node to another.
So i planned to connect crossover cable for heart beat messages, can any one guide me or provide me the link that best explains how to do the same and the changes i have to made in cluster configuration file after connecting the crossover cable.
Hi Lingu,
I realize you're just trying to get this fixed, but what happened on your network to make an ha pair that has been stable for three years start getting flakey?
Everything I know about heartbeat comes from http://www.linux-ha.org/ha.cf.
I'm fairly sure all you need to add to your config is a bcast line. In a simple setup, "bcast eth0 eth1" will send heartbeats over eth0 and eth1, you will probably want "bcast bond0 eth3" depending on your interface names. Make sure you are also pinging a third host (the subnet's gateway is a good choice). There was a heartbeat security issue a couple years ago, you should consider planning to upgrade to a patched version.
Patrick