Users Guide

Synergy Web Server Clustering | Clustering
114 OMNM 6.5.3 Installation Guide
Example:
<!-- Alternative 1: multicast-based automatic discovery.
<MPING timeout="3000"
num_initial_members="3"
mcast_addr="${jboss.partition.udpGroup:230.11.11.11}"
mcast_port="${jgroups.tcp.mping_mcast_port:45700}"
ip_ttl="${jgroups.udp.ip_ttl:2}"/>
-->
Alternative 2: non multicast-based replacement for MPING. Requires a
static configuration of *all* possible cluster members.-->
<TCPPING timeout="3000"
initial_hosts="${jgroups.tcpping.initial_hosts:192.168.53.15[7600],192.
168.53.16[7600],192.168.53.17[7600]}"
port_range="1"
num_initial_members="3"/>
CAUTION:
Unicast depends on configuring this file. Upgrade overwrites it. If you upgrade, copy the file configured
as you might like to a separate location, then return it to its correct location.
Synergy Web Server Clustering
If your system deploys multiple web servers, cluster them to work more efficiently. Enabling
clustering keeps events, indexes and documents in sync between servers in case of a Node failure.
Configure the following to have a successful clustered environment:
• Point all nodes to the same Portal Database or database cluster.
• Make Documents and Media repositories accessible to all nodes within the cluster.
• Configure search for replication.
• Replicate cache across all nodes of the cluster.
• Synergy versions should be the same since they share a database and the schemas must match
the runtime environment for each node.
• Each server should be within the same network and able to access each other without
restrictions. Disable any firewall between nodes. You will need to use unicast instead of
multicast when webserver cluster member nodes are on different IP subnet.
• Use a load balancer to delegate traffic through out the clustered nodes allowing web browsers
to point to a single host/ip (load balancer). See
Using Load Balancers on page 116.
Most of these settings are properties to set within the
server-overrides.properties file in
the
synergy/conf directory. This file preserves property overrides on upgrade.
NOTICE
Online colleagues only appear when they are connected to same web server in a load-bal-
anced situation when clustering is incorrectly configured.