Network Deployment (Distributed operating systems), v8.0 > Reference > Sets
Create a cluster: Create first cluster member
Use this page to specify settings for the first cluster member.
There are two ways to create the first member of a cluster:
- We can create the first member when you create a cluster.
To create a cluster, in the admin console...
Servers > Clusters > WebSphere application server clusters > New.
- We can create an empty cluster and then add a first member after you finish creating the cluster.
To create a cluster member for an existing cluster, in the admin console...
Servers > Clusters > WebSphere application server clusters > cluster_name > Clusters members > New.
When you create the first cluster member, a copy of that member is stored as part of the cluster data and becomes the template for all additional cluster members that you create.
When adding servers to a cluster, remember that the only way to remove an application server from a cluster is to delete the application server from the list of cluster members.
Member name
Name of the application server that is created for the cluster.
The member name must be unique on the selected node.
Select node
Node on which the application server resides.
Weight
Amount of work that is directed to the application server.
If the weight value for the server is greater than the weight values that are assigned to other servers in the cluster, the server receives a larger share of the cluster workload. The value can range from 0 to 20. Enter zero to indicate that you do not want requests to route to this application server unless this server is the only server that is available to receive requests.
Core group
Core group in which the application server resides. This field displays only if we have multiple core groups configured. We can change this value only for the first cluster member.
Generate unique HTTP ports
Specifies that a unique HTTP port is generated for the application server. By generating unique HTTP ports for the application server, you avoid potential port collisions and configurations that are not valid.
Select how the server resources are promoted in the cluster
Specifies how resources such as data sources and schedulers are initially created in the cluster. Create settings at the cluster scope if the settings can be used across the entire cluster. Otherwise, create settings at the cluster member (server) level. Creating settings at the cluster scope reduces the amount of configuration that you maintain.
Attention: When you create a cluster, this setting is disabled if you select None. Create an empty cluster for the Select basis for first cluster member setting. Otherwise, this setting is enabled.
The list has the following options.
Cluster
Moves the resources of the first cluster member to the cluster level. The resources of the first cluster member replace the resources of the cluster. Move resources of the first cluster member when you want to promote the resources of a server to the cluster. Promoting resources is the recommended option.
The Cluster option is the default behavior in the admin console.
Server
Maintains the server resources at the new cluster member level and does not change the cluster level resources. The Server option is most useful in the following situations:
- When you want different configuration settings for resources defined on each cluster member.
- When we have deleted all of your cluster members and want to create new cluster members. However, you do not want to replace the cluster scoped resources when you create the cluster members.
Both
Copies the resources of the cluster member (server) to the cluster level. The resources of the first cluster member replace the resources of the cluster. The same resources exist at both the cluster and cluster member scopes. These options are available only for the first cluster member. All other members of a cluster are based on the cluster member template which is created from the first cluster member.
Select basis for first cluster member
Basis to use for the first cluster member.
- If you select Create the member using an application server template, the settings for the new application server are identical to the settings of the application server template you select from the list of available templates.
- If you select Create the member using an existing application server as a template, the settings for the new application server are identical to the settings of the application server you select from the list of existing application servers.
- If you select Create the member by converting an existing application server, the application server you select from the list of available application servers becomes a member of this cluster.
- If you select None. Create an empty cluster, a new cluster is created but it does not contain any cluster members.
The basis options are available only for the first cluster member. All other members of a cluster are based on the cluster member template which is created from the first cluster member.
Clusters and workload management
Create clusters
Related
Create a cluster: Basic cluster settings
Create a cluster: Create additional cluster members
Create a cluster: Summary settings
Commands using wsadmin.sh