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Foglight 5.9.2 - High Availability Field Guide

Configuring the cluster multicast port used in HA mode

You can change the cluster multicast port that is used when Foglight® is running in High Availability (HA) mode. This port is used by members of an HA cluster to communicate with each other. The primary and secondary Management Servers within each HA partition must be configured to use the same cluster multicast port.

If you plan to have multiple HA partitions on the same sub-network, configure a different cluster multicast port for each HA partition on the sub-network.

Open the file <foglight_home>/config/server.config on each machine hosting a Management Server that is part of the HA cluster.
Set the parameter server.cluster.mcast_port to the desired value in these files.
Save the server.config files.

Important considerations for configuring HA over WAN

Although HA outside of a single subnet (that is, across a WAN) is a supported configuration, it is important to first understand the performance and reliability implications of using this configuration.

Before distributing a Foglight® HA installation across data centers, consider the following:

For more information, see Troubleshooting FAQ , and Tuning connection issues in HA implementations .

Security considerations for HA configuration

JGroups provides the ENCRYPT class with the capability of encryption and decryption communications at any layer, without the need for a coordinator. For more information about the JGroups ENCRYPT class, visit the JGroups website. The Foglight Management Server adopts the option of configuring a secretKey in a keystore to secure the HA mode. This security implementation is specified by the following lines in the <foglight_home>/config/jgroups-config.xml file.

Exploring the High Availability view

The High Availability View, located on the Management Server Administration dashboard, indicates if Foglight® is running in High Availability (HA) mode.

This view displays the following information:

Status shows if Foglight is running in HA mode () or not ().
Peers shows the number of servers in the cluster, not including the current server.
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