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NOTE: CentOS Enterprise Linux is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux.


The REDUNDANCY panel allows you to configure of the backup LVS router node and set various heartbeat monitoring options.

Tip Tip

The first time you visit this screen, it displays an "inactive" Backup status and an ENABLE button. To configure the backup LVS router, click on the ENABLE button so that the screen matches Figure 10-4.

Figure 10-4. The REDUNDANCY Panel

Redundant server public IP

Enter the public real IP address for the backup LVS router node.

Redundant server private IP

Enter the backup node's private real IP address in this text field.

If you do not see the field called Redundant server private IP, go back to the GLOBAL SETTINGS panel and enter a Primary server private IP address and click ACCEPT.

The rest of the panel is devoted to configuring the heartbeat channel, which is used by the backup node to monitor the primary node for failure.

Heartbeat Interval (seconds)

This field sets the number of seconds between heartbeats — the interval that the backup node will check the functional status of the primary LVS node.

Assume dead after (seconds)

If the primary LVS node does not respond after this number of seconds, then the backup LVS router node will initiate failover.

Heartbeat runs on port

This field sets the port at which the heartbeat communicates with the primary LVS node. The default is set to 539 if this field is left blank.

Warning Warning

Remember to click the ACCEPT button after making any changes in this panel to make sure you do not lose any changes when selecting a new panel.

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