Moving core group members

When moving members to a different core group, remember that: each WebSphere process can only be a member of one core group, all members of a given cluster must belong to the same core group, and each core group must contain at least one deployment manager or node agent process.

• Review core group concepts.

• Determine which core group members you want to move, and to which core group you want to move them

  The steps you perform to move either an application server, a deployment manager, or a node agent are slightly different.

  In general, you should not move a deployment manager.

• Stop the processes you are moving, using the following guidelines:

  • Case 1: You are not moving the deployment manager. Stop all of the processes you are moving.

  • Case 2: You are moving the deployment manager. Because the deployment manager has to be moved separately, stop all of the other processes you are moving, but leave the deployment manager running until after you have moved all of these other processes.

Overview

• To populate a newly created core group.

• To rebalance existing core groups.

Depending on the whether you are moving an application server, a deployment manager, or a node agent, perform one of the following steps.

Procedure

1. Move one or more application servers to another core group.

   1. Stop the application servers that you want to move.

   2. In the administrative console, click Servers > Core groups > Core group settings to display a list of the core groups in the topology.

   3. Click the name of the core group that contains the application servers that you want to move.

   4. On the configuration page for this core group, under Additional Properties, click Core group servers to display the list of members of this core group. This list includes all of the application servers, node agents, and deployment managers that are members of this core group.

   5. In the Select column, select the application servers that you want to move to a new core group.

      You can only designate one target core group to which to move the selected application servers. If you need to move some of the application servers on this list to two or more other core groups, you have to repeat this step and the following step for each core group.

   6. Click Move. The Core groups > core_group_name > Core group servers > Move administrative console page is displayed. This page lists the application servers that you selected to move and the core group to which they currently belong.

   7. Select the core group to which you want these application servers moved. The pull-down, under To core group, lists the core groups that are available on your system.

   8. Click Apply, and then click Save.

   9. Click System administration > Nodes, select all running nodes, and then click Synchronize to synchronize your configuration changes to all of the running nodes.

   10. Restart the application servers that you moved.

2. Move one or more node agents to another core group.

   1. Stop the node agents that you want to move.

   2. In the administrative console, click Servers > Core groups > Core group settings to display a list of the core groups in the topology.

   3. Click the name of the core group that contains the node agents that you want to move.

   4. On the configuration page for this core group, under Additional Properties, click Core group servers to display the list of members of this core group. This list includes all of the application servers, node agents, and deployment managers that are members of this core group.

   5. In the Select column, select the node agents that you want to move to a new core group.

      You can only designate one target core group to which to move the selected node agents. If you need to move some of the node agents on this list to two or more other core groups, you have to repeat this step and the following step for each core group.

   6. Click Move. The Core groups > core_group_name > Core group servers > Move administrative console page is displayed. This page lists the node agents that you selected to move and the core group to which they currently belong.

   7. Select the core group to which you want these node agents moved. The pull-down, under To core group, lists the core groups that are available on your system.

   8. Click Apply, and then click Save.

   9. Issue the syncNode command from the profile_root/node_agent_profile/bin directory to manually synchronize the updated configuration to the node.

      This synchronization must be performed before you restart the moved node agent.

   10. Restart the node agent that you moved.

3. Move one or more deployment managers to another core group.

   1. Stop the deployment managers that you want to move.

   2. Issue the wsadmin –conntype NONE –lang jython command from the profile_root/deployment_manager_profile/bin directory to start a local mode scripting session under the deployment manager profile.

   3. In the local mode scripting session, move the deployment manager using the following command.

      AdminTask.moveServerToCoreGroup("-source <source_Core_Group> - target <target_Core_Group> -nodeName <node_name> -serverName <server_name>")

   4. Issue the AdminConfig.save() command to save the configuration changes.

   5. Restart the deployment manager that you moved.

   6. Click System administration > Nodes, select all running nodes, and then click Synchronize to synchronize your configuration changes to all of the running nodes.

Results

What to do next

• You can verify that the servers are in the correct core groups. For each core group, in the administrative console, click Servers > Core groups > Core group settings > core_group_name > Core group servers and look at the list of core group members that displays.

• You can set up core group bridges if any of the core groups need to communicate with each other. See Core group communications using the core group bridge service for more information.

Related concepts

Related tasks