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Chapter 26. Configure JGroups


JGroups is the underlying group communication library used to connect Red Hat JBoss Data Grid instances. For a full list of JGroups protocols supported in JBoss Data Grid, see Section A.1, “Supported JGroups Protocols”

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 a 169.x.x.x or 254.x.x.x address. This suits the traffic within one box.
    <interfaces>
        <interface name="link-local">
            <link-local-address/>
        </interface>
        <!-- Additional configuration elements here -->
    </interfaces>
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  • site-local: Uses a private IP address, for example 192.168.x.x. This prevents extra bandwidth charged from GoGrid, and similar providers.
    <interfaces>
        <interface name="site-local">
            <site-local-address/>
        </interface>
        <!-- Additional configuration elements here -->
    </interfaces>
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  • global: Picks a public IP address. This should be avoided for replication traffic.
    <interfaces>
        <interface name="global">
            <any-address/>
        </interface>
        <!-- Additional configuration elements here -->
    </interfaces>
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  • non-loopback: Uses the first address found on an active interface that is not a 127.x.x.x address.
    <interfaces>
        <interface name="non-loopback">
            <not>
    	    <loopback />
    	</not>
        </interface>
    </interfaces>
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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" <!-- Additional configuration elements here --> interface="site-local"/>
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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"> 
	<!-- Additional configuration elements here -->
	<socket-binding name="jgroups-tcp" port="7600"/>
	<socket-binding name="jgroups-tcp-fd" port="57600"/>
	<!-- Additional configuration elements here -->
</socket-binding-group>
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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">
            <!-- Additional configuration elements here -->
        </transport>
        <!-- rest of protocols -->
    </stack>
</subsystem>
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Important

When using UDP as the JGroups transport, the socket binding has to specify the regular (unicast) port, multicast address, and multicast port.
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