Dear Pacemaker community!
I want to install 2 Centos machines and to configure HA using one virtual IP. I do not want to use power card or something like this. I want to use communication to determine the failing of nodes: broadcast / mulicast UDP / TCP. But I am confused if it possible. From one side I see here that the failover is configured without any hardware: http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html-single/Clusters_from_Scratch/index.html#_perform_a_failover On the second side I see that on quickstart and FAQ required a fencing device (that is hardware): 1. On quickstart http://clusterlabs.org/quickstart-redhat.html you can find the followowing commands: ccs -f /etc/cluster/cluster.conf --addfencedev pcmk agent=fence_pcmk 2. Similar here: http://clusterlabs.org/quickstart-ubuntu.html <fencedevice name="pcmk" agent="fence_pcmk"/> 3. http://clusterlabs.org/faq.html Q: Do I need a fencing device? A: Yes. Fencing is the only 100% reliable way to ensure the integrity of your data and that applications are only active on one host. Although Pacemaker is technically able to function without Fencing, there are a good reasons SUSE and Red Hat will not support such a configuration. Please help! Will be great if you provide the link to the appropriate documentation. Best regards, Michael
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