Chapter 26. Configure JGroups
JGroups is the underlying group communication library used to connect Red Hat JBoss Data Grid instances.
26.1. Configure Red Hat JBoss Data Grid Interface Binding (Remote Client-Server Mode)
26.1.1. Interfaces
Red Hat JBoss Data Grid allows users to specify an interface type rather than a specific (unknown) IP address.
link-local: Uses a169.x.x.xor254.x.x.xaddress. This suits the traffic within one box.<interfaces> <interface name="link-local"> <link-local-address/> </interface> ... </interfaces>site-local: Uses a private IP address, for example192.168.x.x. This prevents extra bandwidth charged from GoGrid, and similar providers.<interfaces> <interface name="site-local"> <site-local-address/> </interface> ... </interfaces>global: Picks a public IP address. This should be avoided for replication traffic.<interfaces> <interface name="global"> <any-address/> </interface> ... </interfaces>non-loopback: Uses the first address found on an active interface that is not a127.x.x.xaddress.<interfaces> <interface name="non-loopback"> <not> <loopback /> </not> </interface> </interfaces>
26.1.2. Binding Sockets
Socket bindings provide a named the combination of interface and port. Sockets can be bound to the interface either individually or using a socket binding group.
26.1.2.1. Binding a Single Socket Example
The following is an example depicting the use of JGroups interface socket binding to bind an individual socket using the
socket-binding element.
Example 26.1. Socket Binding
<socket-binding name="jgroups-udp" ... interface="site-local"/>
26.1.2.2. Binding a Group of Sockets Example
The following is an example depicting the use of Groups interface socket bindings to bind a group, using the
socket-binding-group element:
Example 26.2. Bind a Group
<socket-binding-group name="ha-sockets" default-interface="global"> ... <socket-binding name="jgroups-tcp" port="7600"/> <socket-binding name="jgroups-tcp-fd" port="57600"/> ... </socket-binding-group>
The two sample socket bindings in the example are bound to the same
default-interface (global), therefore the interface attribute does not need to be specified.
26.1.3. Configure JGroups Socket Binding
Each JGroups stack, configured in the JGroups subsystem, uses a specific socket binding. Set up the socket binding as follows:
Example 26.3. JGroups Socket Binding Configuration
<subsystem xmlns="urn:jboss:domain:jgroups:1.2" default-stack="udp">
<stack name="udp">
<transport type="UDP" socket-binding="jgroups-udp">
...
</transport>
<!-- rest of protocols -->
</stack>
</subsystem>Important
When using UDP as the JGroups transport, the socket binding has to specify the regular (unicast) port, multicast address, and multicast port.
