the same broker name and the same group name) and both instances will therefore form a master/slave broker pair. Each master broker will create a network bridge to all other active broker instances within the same network group.
Note: Its generally not advisable to create large broker meshes (e.g. 4 broker instances) as depending on the use case it will cause some chatter on advisory messages that these broker instances exchange.
Fully connected Broker Mesh The above example sets up a master/slave pair for each broker group, where only one instance is active at a time. Its also possible to configure for multiple active broker instances within the same group.
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Its of course possible to add additional master/slave pairs to this broker group if needed and all active broker instances (i.e. master broker instances) will reconfigure their network bridge dynamically as new brokers enter or leave the network group.
Using -network BrokerClusterMesh a network bridge is configured in each broker that points to its own network group name. This in essence will create a network bridge from each broker to all the other broker instances within the same group.
So a full mesh of 3 broker instances gets created. This mesh can be expanded with additional instances if needed. Once a new instance is introduced all broker instances reconfigure their network bridges accordingly.
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This is achieved using the following commands: fabric:mq-create -group BrokerClusterMeshWithSlave -networks BrokerClusterMeshWithSlave -create-container MeshBroker1,MeshBroker2 -networks-password admin -networks-username admin BrokerClusterMeshWithSlave1 fabric:mq-create -group BrokerClusterMeshWithSlave -networks BrokerClusterMeshWithSlave -create-container MeshBroker3,MeshBroker4 -networks-password admin -networks-username admin BrokerClusterMeshWithSlave2 This command differs from the previous example only in.
In this example only two broker instances get created so its a fairly small mesh. However you can easily add another broker to the group, e.g. by running fabric:mq-create -group BrokerClusterMesh -networks BrokerClusterMesh -create-container MeshBroker3 -networks-password admin -networks-username admin BrokerClusterMesh3.
Full Broker Mesh with Master/Slave pair on each Broker Combining the last two use cases its also possible to configure a full broker mesh where each broker consists of a master/slave pair.
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Each profile configures an ActiveMQ broker. Both broker configurations are part of the same group BrokerClusterMesh. Using -create-container, each profile gets deployed to exactly one OSGi container. Since both broker instances have their own broker name configured (BrokerClusterMesh1 and BrokerClusterMesh2).
Each master/slave pair belongs to one broker group. A network bridge between the two master will be established in both directions. If one of the master broker dies or gets shut down, the slave broker will take over within a.
This can be created by invoking fabric:mq-create -group network-brokers1 -create-container broker1_1,broker1_2 -networks network-brokers2 -networks-password admin -networks-username admin MasterSlaveBroker1 fabric:mq-create -group network-brokers2 -create-container broker2_1,broker2_2 -networks network-brokers1 -networks-password admin -networks-username admin MasterSlaveBroker2 These commands create two Fabric profiles.
The previous example deploys the broker configuration to only one container. Now we deploy each broker configuration to two containers. Each container within -create-container will use exactly the same broker configuration (i.e.
xml in mq-base to your needs (e.g. configure systemUsage and policy entries) and then create your broker instances using mq-create and they will all leverage this configuration. - The broker configuration in mq-base does not configure any network bridges.
As no -group argument was specified the group name will be default . The option -create-container broker1,broker2 also deploys this profile to two new OSGi container instances called broker1 and broker2. As both container instances deploy the very same profile.
Further the MasterSlaveBroker1 that is part of the group network-brokers1 configures a network connector to the broker instances in the group network-brokers2 and vice versa. Using -create-container we instantiate two OSGi container in each command that each deploy the relevant.
Each profile configures an ActiveMQ broker with the names MasterSlaveBroker1 and MasterSlaveBroker2. Each broker configuration also sets a group name so that the broker instances will be part of that group.
Fuse Fabric is a very powerful open source integration platform (iPaaS) developed by Red Hat (former FuseSource ). If you don t know what Fabric is, have a look at the project web site: http fuse.
Username and password are supplied using the arguments -networks-password admin -networks-username admin. Altogether these two commands create four broker instances out of which only two will be master broker instances, the other two will be slave instance.