WebSphere Extended Deployment, Version 6.0.x
             Operating Systems: AIX, HP-UX, Linux, Solaris, Windows, z/OS


Creating or editing a node group

Node groups and dynamic clusters are fundamental building blocks of the dynamic operations environment. Node groups must be created to provide the functional basis of the WebSphere® Extended Deployment dynamic operations environment. This task describes how to create a node group or edit an existing node group. After completing this task, you can create a dynamic cluster and associate it with this node group.

Before you begin

You must be familiar with the concept of a node group and understand the attributes, such as grouping together nodes with a common characteristic, and associating node groups and dynamic clusters to support the on-demand mode for WebSphere Extended Deployment, called dynamic operations. You must understand what common properties your node group contains and how this can be exploited in your infrastructure.

WebSphere Extended Deployment must be installed and you need access to its administrative console.

Depending on your administrative role, you are allowed specific privileges when managing nodes. The following list shows the administrative roles and privileges for managing nodes:
Monitor
Can view the information.
Operator
Can set and unset maintenance nodes.
Can synchronize nodes.
Can stop nodes.
Configurator
Can view the configuration.
Can add and remove nodes.
Administrator
Has all privileges.

About this task

For basic dynamic operations, define a node group specifically for nodes that are running dynamic clusters. Do not run the ODR on a node that is a part of this node group.

Procedure

  1. From the administrative console, click System administration > Node groups. You can select an existing node group for editing, or click New to create a new node group.

    By default the DefaultNodeGroup node group is created during installation of WebSphere Extended Deployment. You cannot modify this node group; it is used by configuration options that are run at installation to create your system. You can place your ODR nodes in the DefaultNodeGroup.

    If you create a new node group, ensure that you use a good naming schema and completing the description field with easily recognizable descriptions. For example, in a large scale environment, create a naming schema that supports immediate recognition, and use a prefix to ensure that nodes stand out.

    Click OK.

  2. Add or remove nodes from the node group.

    Search for the node by clicking on the available node groups. Select the local topology tab to view the node associations per node group. To get a visual perspective of all of the nodes in a given node group, use the runtime map. For more information about the runtime map, see The runtime map environment .

    Click Apply or OK to keep your changes.

  3. Optional: If you intend to implement dynamic clusters, you can do the following to override default member behavior before creating the dynamic cluster. By default, the dynamic cluster member GenerateUniquePorts value is set to True for the first dynamic cluster member, while subsequent members are set to False for the z/OS® operating system nodes and to True for the distributed nodes. Override this behavior by doing the following:
    1. Click System administration > Node groups > node_name > Custom Properties.
    2. Set GenerateUniquePorts to True or False, as needed.
    3. Additionally, you can override this behavior at the node level by setting the node group's Custom Properties GenerateUniquePorts.nodename to True or False, as needed.
  4. [For z/OS operating system] Optional: To implement vertical stacking, click System administration > Node groups > nodename > Custom Properties and set the GenerateUniquePorts value to True to permit all the dynamic cluster member instances to start successfully on the same node. Without this setting, only one instance can start and the rest cannot start on the same node because of a port conflict.

Results

You have now created or edited a node group.

What to do next

After you create the node group, you can perform the following tasks:



Related tasks
Preparing the hosting environment for dynamic operations
Related reference
NodeGroupProcs.jacl
Administrative roles and privileges
Task topic    

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Last updated: Oct 16, 2009 11:06:12 AM EDT
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