This documentation is for older versions of WSO2 products and may not be relevant now. Please see your respective product documentation for clustering details and configurations.

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  1. Download and unzip the WSO2 AS binary distribution. Consider the extracted directory as <PRODUCT_HOME>.
  2. Set up the cluster configurations. Edit the <PRODUCT_HOME>/repository/conf/axis2/axis2.xml file as follows.
    1. Enable clustering for this node.
      <clustering class="org.wso2.carbon.core.clustering.hazelcast.HazelcastClusteringAgent" enable="true">
    2. Set the membership scheme to wka to enable the well-known address registration method (this node will send cluster initiation messages to WKA members that we will define later).
      <parameter name="membershipScheme">wka</parameter>
    3. Specify the name of the cluster this node will join.
      <parameter name="domain">wso2.as.domain</parameter>
    4. Specify the host used to communicate cluster messages.
      <parameter name="localMemberHost">xxx.xxx.xxx.xx3</parameter>
    5. Specify the port used to communicate cluster messages. If this node is on the same server as the manager node, or another worker node, set this to a unique value, such as 4000 and 4001 for worker nodes 1 and 2. This port number will not be affected by the port offset in carbon.xml. If this port number is already assigned to another server, the clustering framework will automatically increment this port number.
      <parameter name="localMemberPort">4200</parameter>

    6. Define the sub-domain as worker by adding the following property under the  <parameter name="properties">  element: 
      <property name="subDomain" value="worker"/>

    7. Specify the well known member by providing the host name and localMemberPort values. Here, the well known member is the manager node. Defining the manager node is useful since it is required for the Deployment Synchronizer to function in an efficient manner. The deployment synchronizer uses this configuration to identify the manager and synchronize deployment artifacts across the nodes of a cluster.

      Code Block
      languagexml
      <members>
      	<member>
      		<hostName>xxx.xxx.xxx.xx2</hostName>
      		<port>4100</port> 
      	</member>
      </members>
      Note

      Although this example only indicates one well-known member, it is recommended to add at least two well-known members here. This is done to ensure that there is high availability for the cluster.

      You can also use IP address ranges for the hostName. For example, 192.168.1.2-10. This should ensure that the cluster eventually recovers after failures. One shortcoming of doing this is that you can define a range only for the last portion of the IP address. You should also keep in mind that the smaller the range, the faster the time it takes to discover members, since each node has to scan a lesser number of potential members.

  3. Configure the HostName. To do this, edit the <PRODUCT_HOME>/repository/conf/carbon.xml file as follows.

    Code Block
    languagexml
    <HostName>as.wso2.com</HostName>
  4. Enable SVN-based deployment synchronization with the AutoCommit property marked as false. To do this, edit the <PRODUCT_HOME>/repository/conf/carbon.xml file as follows.

    Code Block
    languagexml
    <DeploymentSynchronizer>
    	<Enabled>true</Enabled>
    	<AutoCommit>false</AutoCommit>
    	<AutoCheckout>true</AutoCheckout>
    	<RepositoryType>svn</RepositoryType>
    	<SvnUrl>https://svn.wso2.org/repos/as</SvnUrl>
    	<SvnUser>svnuser</SvnUser>
    	<SvnPassword>xxxxxx</SvnPassword>
    	<SvnUrlAppendTenantId>true</SvnUrlAppendTenantId>
    </DeploymentSynchronizer>
  5. In the <PRODUCT_HOME>/repository/conf/carbon.xml file, you can also specify the port offset value. This is ONLY applicable if you have multiple WSO2 products hosted on the same server.

    Expand
    titleClick here for more information on configuring the port offset.

    When you run multiple products/clusters or multiple instances of the same product on the same server or virtual machines (VMs), you must change their default ports with an offset value to avoid port conflicts. An offset defines the number by which all ports in the runtime (e.g., HTTP/(S) ports) are increased. For example, if the default HTTP port is 9763 and the offset is 1, the effective HTTP port will change to 9764. For each additional product instance, you set the port offset to a unique value. The offset of the default ports is considered to be 0.

    The port value will automatically be increased as shown in the Port Value column in the following table, allowing all five WSO2 product instances or servers to run on the same machine.

    WSO2 product instance

    Port Offset

    Port Value

    WSO2 server 1

    0

    9443

    WSO2 server 2

    1

    9444

    WSO2 server 3

    2

    9445

    WSO2 server 4

    3

    9446

    WSO2 server 5

    4

    9447

    Warning

    Important: This step is optional and only required if all server instances are running in the same machine. This is not a recommended approach for production environments. Note that you need to change all ports used in your configurations based on the offset value if you are to do this.

    Code Block
    languagexml
    <Ports>
    	...
    	<Offset>0</Offset>
    	...
    </Ports>
  6. Map the host names to the IP. Add the below host entries to your DNS, or “/etc/hosts” file (in Linux) in all the nodes of the cluster. You can map the IP address of the database server. In this example, MySQL is used as the database server, so <MYSQL-DB-SERVER-IP> is the actual IP address of the database server.

    Code Block
    <IP-of-MYSQL-DB-SERVER>	carbondb.mysql-wso2.com
  7. Configure the HTTP/HTTPS proxy ports to communicate through the load balancer by editing the <PRODUCT_HOME>/repository/conf/tomcat/catalina-server.xml file as follows.

    Code Block
    languagexml
    <Connector protocol="org.apache.coyote.http11.Http11NioProtocol"
    port="9763"
    proxyPort="80"
    	...
    	/>
    <Connector protocol="org.apache.coyote.http11.Http11NioProtocol"
    port="9443"
    proxyPort="443"
    	...
    	/>
  8. Create the second worker node by getting a copy of the WSO2 product you just configured as a worker node and change the following in the <PRODUCT_HOME>/repository/conf/axis2/axis2.xml file. This copy of the WSO2 product can be moved to a server of its own.
    <parameter name="localMemberPort">4300</parameter>

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