8.2. Clustering configuration
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## 8.2. Clustering configuration

Orchestra can run in a clustered environment.

In a clustered environment, all Orchestra nodes share the same database.

When a process is deployed in Orchestra, the process web services are deployed on each node of the cluster. An instance of the process can execute on any node of the cluster.

| Important
In a clustered environment, reply activities are not supported. The web services exported by Orchestra are only one-way web services.

In this version, Orchestra cluster configuration is done by declaring the cluster nodes in the environment.xml file.

To declare a cluster, add these lines to the environment-factory part of the configuration file:

    <static-cluster>
      <jmx-server serviceUrl="..." objectName="..." />
      <jmx-server serviceUrl="..." objectName="..." />
    </static-cluster>

Each jmx-server element describes an Orchestra node. The serviceUrl and objectName attributes are the parameters to use to connect to the JMX interface of the node. These values are configured for each node in the orchestra.properties file.

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