How to Add a Logical Hostname Resource to a Resource Group

To complete this procedure, you must supply the following information.

• the name of the failover resource group into which you are adding the resource

• the hostnames that you plan to add to the resource group

See the scrgadm(1M) man page for additional information.

Perform this procedure from any cluster node.

1. Become superuser on a cluster member.

2. Add the logical hostname resource to the resource group.

   # scrgadm -a -L [-j resource] -g resource-group -l hostnamelist, ... [-n netiflist]

   -a

   Adds a logical hostname resource.

   -L

   Specifies the logical hostname resource form of the command.

   -j resource

   Specifies an optional resource name of your choice. If you do not specify this option, the name defaults to the first hostname that is specified with the -l option.

   -g resource-group

   Specifies the name of the resource group in which this resource resides.

   -l hostnamelist, ...

   Specifies a comma-separated list of UNIX hostnames (logical hostnames) by which clients communicate with services in the resource group.

   -n netiflist

   Specifies an optional, comma-separated list that identifies the NAFO groups on each node. All of the nodes in the resource group's node list must be represented in netiflist. See the scrgadm(1M) man page for a description of the syntax for specifying netiflist. If you do not specify this option, the scrgadm command attempts to discover a net adapter on the subnet that the hostnamelist identifies for each node in the node list.

3. Verify that the logical hostname resource has been added.

   # scrgadm -pv -j resource

   Adding the resource causes the Sun Cluster software to validate the resource. If the validation succeeds, you can enable the resource, and you can move the resource group into the state where the RGM manages it. If the validation fails, the scrgadm command produces an error message and exits. If the validation fails, check the syslog on each node for an error message. The message appears on the node that performed the validation, not necessarily the node on which you ran the scrgadm command.

Example - Adding a Logical Hostname Resource to a Resource Group

This example shows the addition of logical hostname resource (resource-1) to a resource group (resource-group-1).

# scrgadm -a -L -j resource-1 -g resource-group-1 -l schost-1
# scrgadm -pv -j resource-1
Res Group name: resource-group-1
(resource-group-1) Res name:                              resource-1
  (resource-group-1:resource-1) Res R_description:
  (resource-group-1:resource-1) Res resource type:        SUNW.LogicalHostname
  (resource-group-1:resource-1) Res resource group name:  resource-group-1
  (resource-group-1:resource-1) Res enabled:              False
  (resource-group-1:resource-1) Res monitor enabled:      True

Where to Go From Here

After you add logical hostname resources, use the procedure "How to Bring a Resource Group Online" to bring them online.