Enable a node to be added to a cluster

Before you can add a node to a cluster, you need to set a value for the Allow add to cluster (ALWADDCLU) network attribute.

Use the Change Network Attributes (CHGNETA) command on any server that you want to set up as a cluster node. The Change Network Attributes (CHGNETA) command changes the network attributes of a system. The ALWADDCLU network attribute specifies whether a node will allow another system to add it as a node in a cluster.

You can pick one of these values:

*SAME

The value does not change. The system is shipped with a value of *NONE.

*NONE

No other system can add this system as a node in a cluster.

*ANY

Any other system can add this system as a node in a cluster.

*RQSAUT

Any other system can add this system as a node in a cluster only after the cluster add request has been authenticated.

The ALWADDCLU network attribute is checked to see if the node that is being added is allowed to be part of the cluster and whether to validate the cluster request through the use of X.509 digital certificates. A digital certificate is a form of personal identification that can be verified electronically. If validation is required, the requesting node and the node that is being added must have the following installed on the systems:

• i5/OS™ Option 34 (Digital Certificate Manager)
• Cryptographic Access Provider

When *RQSAUT is selected, the certificate authority trust list for the i5/OS cluster security server application must be properly set up. The server application identifier is QIBM_QCST_CLUSTER_SECURITY. At a minimum, add certificate authorities for those nodes that you allow to join the cluster.