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A comment on Basic Concepts of High Availability Linux. Parent comment

Re:Basic Concepts of High Availability Linux by ww520 on Sunday March 23, 2014 @05:52PM (#7455364)
The Linux HA Heartbeat (http://www.linux-ha.org/wiki/Heartbeat) package supports virtual IP takeover in case of a fail over.

In a two-machine cluster, you configure two network interfaces for each machine. One interface has the real IP of the machine, serving as the private IP. Another interface has the virtual IP, serving as the public IP which all other clients connect to. Configure the second machine the same way with the same virtual IP but has it disabled.

When Heartbeat detects a failure on the primary machine, it would make the standby machine as primary and enable its virtual IP interface. The ARP service on the second machine broadcasts to all machines in the subnet to claim the virtual IP address as its own.

It's a pretty simple process.

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Re:Basic Concepts of High Availability Linux by reader_1000 on Monday March 24, 2014 @01:40PM (#7459774)
I think same problems apply to both ucarp and heartbeat, they do not check service status, if I am not wrong. Also it is stated that heartbeat is deprecated and continue with corosync, but corosync seems more complicated.
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