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Foglight for Virtualization Enterprise Edition 8.6 - High Availability Field Guide

Running behind an HTTP proxy

One of the most common configurations is running the Management Server in HA mode behind a proxy so that end users and the agent configuration only need one URL for connection to the browser interface.

In the following example, a third-party software program called balance is used as a proxy.

Configure balance to forward connections made to the server’s port 8888 to the Foglight™ UI port on the two machines in the HA cluster.

Running in a cluster

This section describes one scenario for running the Foglight™ Management Server in HA mode with clustering at the application layer. In particular, the focus is on operating system level clustering used in commercial systems such as Oracle®, Microsoft®, and VeritasTM clusters.

This scenario uses the Linux® HA Project’s heartbeat software for SuSE ES 10.1. The heartbeat package includes a virtual IP resource called IPaddr2.

For more information about the Linux HA Project and heartbeat, see


Tuning connection issues in HA implementations

In some cases, the communication between servers in the cluster is not reliable. Sometimes unwanted behaviors occur, such as:

These issues may be attributable to JGroup (the underlying communication package that JBoss® uses for its HA implementation) and to the fact that a Foglight HA implementation uses UDP for communication by default and UDP is by nature an unreliable protocol.

Tuning the Management Server

If you encounter these HA issues, consider performing the following tuning exercise.

Warning: system time not in sync with primary server, Mon Aug 30 11:47:57 ECT 2010 vs Mon Sug 30 11:48:52 EDT 2010.)

Edit the server/jboss/deploy/cluster-service.xml file.
Change otherhost to the host name of the secondary server in the cluster. For example:
host3[7800]" port_range="3"
<TCPPING initial_hosts="$[7800],host1[7800]" port_range="3"
NOTE: In these examples, 7800 is the port number used for TCP communication. For more information about the HA ports used by the Management Server, see Configuring High Availability mode ports .
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