- serial /dev/ttyS0
- Use a serial heartbeat - if you don't use a serial heartbeat, you must use another medium, such as a bcast (ethernet) heartbeat. Replace /dev/ttyS0 with the appropriate device file for your required serial heartbeat.
- watchdog /dev/watchdog
- Optional. The watchdog function provides a way to have a system that is still minimally functioning, but not providing a heartbeat, reboot itself after a minute of being sick. This could help to avoid a scenario where the machine recovers its heartbeat after being pronounced dead. If that happened and a disk mount failed over, you could have two nodes mounting a disk simultaneously. If you wish to use this feature, then in addition to this line, you will need to load the "softdog" kernel module and create the actual device file. To do this, first type "insmod softdog" to load the module. Then, type "grep misc /proc/devices" and note the number it reports (should be 10). Next, type "cat /proc/misc | grep watchdog" and note that number (should be 130). Now you can create the device file with that info typing, "mknod /dev/watchdog c 10 130".
- bcast eth1
- Specifies to use a broadcast heartbeat over the eth1 interface (replace with eth0, eth2, or whatever you use).
- keepalive 2
- Sets the time between heartbeats to 2 seconds.
- warntime 10
- Time in seconds before issuing a "late heartbeat" warning in the logs.
- deadtime 30
- Node is pronounced dead after 30 seconds.
- initdead 120
- With some configurations, the network takes some time to start working after a reboot. This is a separate "deadtime" to handle that case. It should be at least twice the normal deadtime.
- hopfudge 1
- Optional. For ring topologies, number of hops allowed in addition to the number of nodes in the cluster.
- baud 19200
- Speed at which to run the serial line (bps).
- udpport 694
- Use port number 694 for bcast or ucast communication. This is the default, and the official IANA registered port number.
- auto_failback on
- Required. For those familiar with Tru64 Unix, heartbeat acts as if in "favored member" mode. The master listed in the haresources file holds all the resources until a failover, at which time the slave takes over. When auto_failback is set to on once the master comes back online, it will take everything back from the slave. When set to off this option will prevent the master node from re-acquiring cluster resources after a failover. This option is similar to to the obsolete nice_failback option. If you want to upgrade from a cluster which had nice_failback set off, to this or later versions, special considerations apply in order to want to avoid requiring a flash cut. Please see the FAQ for details on how to deal with this situation.
- node linuxha1.linux-ha.org
- Mandatory. Hostname of machine in cluster as described by `uname -n`.
- node linuxha2.linux-ha.org
- Mandatory. Hostname of machine in cluster as
described by `uname -n`.
- respawn userid cmd
- Optional: Lists a command to be spawned and monitored. Eg: To spawn ccm daemons the following line has to be added:
- respawn hacluster
/usr/lib/heartbeat/ccm
Informs heartbeat to spawn the command with the credentials of that of userid (hacluster, in this example) and monitors the health of the process, respawning it if dead. For ipfail, the line would be:
respawn hacluster /usr/lib/heartbeat/ipfail
NOTE: If the process dies with exit code 100, the process is not respawned. -
- ping ping1.linux-ha.org ping2.linux-ha.org ....
- Optional: Specify ping nodes. These nodes are not considered as cluster nodes. They are used to check network connectivity for modules like ipfail.
- ping_group name ping1.linux-ha.org ping2.linux-ha.org ....
- Optional: Specify a group ping nodes. These are the
similar to ping nodes, but if any node in a group is available
then the group is considered available. The group name can
be any string and is used to uniquely identify the group.
Each group must appear on a separate line.
Like ping nodes the group is not considered to be a cluster node.
They appear to be the same as ping nodes and are used to check network
connectivity for modules like ipfail.
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