Creating a Resource Group

A resource group contains a set of resources, all of which are brought online or offline together on a given node or set of nodes. You must create an empty resource group before you place resources into it. A resource group can be configured to run in global-cluster non-voting nodes.

Note - The global-cluster non voting nodes that are specified in the resource group's node list do not need to exist when the resource group is created. If the node specified in the node list is not detected by the RGM, a warning message is displayed but does not result in an error.

The two resource group types are failover and scalable. A failover resource group can be online on one node only at any time, while a scalable resource group can be online on multiple nodes simultaneously.

The following procedures explain how to use the clresourcegroup(1CL) command to create a resource group.

For conceptual information about resource groups, see Chapter 1, Planning for Oracle Solaris Cluster Data Services and Oracle Solaris Cluster Concepts Guide.

How to Create a Failover Resource Group

A failover resource group contains the following types of resources:

Network address resources, which are instances of the built-in resource types LogicalHostname and SharedAddress
Failover resources, which are the data service application resources for a failover data service

The network address resources and their dependent data service resources move between cluster nodes when data services fail over or are switched over.

Note - Perform this procedure from any cluster node.

On a cluster member, become superuser or assume a role that provides solaris.cluster.modify RBAC authorization.
Create the failover resource group.
```
# clresourcegroup create [-n node-zone-list] resource-group
```
-n node-zone-list

Specifies a comma-separated, ordered list of nodes that can master this resource group. The format of each entry in the list is node:zone. In this format, node specifies the node name and zone specifies the name of a global-cluster non-voting node. To specify the global-cluster voting node, or to specify a node without global-cluster non-voting nodes, specify only node.
This list is optional. If you omit this list, the resource group is created on all nodes in the cluster.

Note - To achieve highest availability, specify global-cluster non-voting nodes on different global-cluster voting nodes in a failover resource group's node list instead of different nodes on the same global-cluster voting node.

resource-group

Specifies your choice of the name of the failover resource group to add. This name must begin with an ASCII character.
Verify that the resource group has been created.
```
# clresourcegroup show resource-group
```

Example 2-4 Creating a Failover Resource Group

This example shows the creation of the failover resource group resource-group-1. The global cluster voting nodes phys-schost-1 and phys-schost-2 can master this resource group.

# clresourcegroup create -n phys-schost1,phys-schost-2 resource-group-1
# clresourcegroup show -v resource-group-1

=== Resource Groups and Resources ===          

Resource Group:                                 resource-group1
RG_description:                                 <NULL>
RG_mode:                                        Failover
RG_state:                                       Unmanaged
RG_project_name:                                default
RG_affinities:                                  <NULL>
RG_SLM_type:                                    manual
Auto_start_on_new_cluster:                      True
Failback:                                       False
Nodelist:                                       phys-schost-1 phys-schost-2
Maximum_primaries:                              1
Desired_primaries:                              1
RG_dependencies:                                <NULL>
Implicit_network_dependencies:                  True
Global_resources_used:                          <All>
Pingpong_interval:                              3600
Pathprefix:                                     <NULL>
RG_System:                                      False
Suspend_automatic_recovery:                     False

Next Steps

After you create a failover resource group, you can add application resources to this resource group. See Tools for Adding Resources to Resource Groups for the procedure.

How to Create a Scalable Resource Group

A scalable resource group is used with scalable services. The shared address feature is the Oracle Solaris Cluster networking facility that enables the multiple instances of a scalable service to appear as a single service. You must first create a failover resource group that contains the shared addresses on which the scalable resources depend. Next, create a scalable resource group, and add scalable resources to that group. The node list of a scalable resource group or of the shared address resource group must not contain more than one global-cluster non-voting node on the same node. Each instance of the scalable service must run on a different cluster node.

You can configure a scalable resource group to run in a global-cluster non-voting node as well. Do not configure a scalable resource to run in multiple global-cluster non-voting nodes on the same node.

Note - Perform this procedure from any cluster node.

On a cluster member, become superuser or assume a role that provides solaris.cluster.modify RBAC authorization.
Create the failover resource group that holds the shared addresses that the scalable resource is to use.
Create the scalable resource group.
```
# clresourcegroup create\-p Maximum_primaries=m\-p Desired_primaries=n\
-p RG_dependencies=depend-resource-group\
[-n node-zone-list] resource-group
```
-p Maximum_primaries=m

Specifies the maximum number of active primaries for this resource group.

-p Desired_primaries=n

Specifies the number of active primaries on which the resource group should attempt to start.

-p RG_dependencies=depend-resource-group

Identifies the resource group that contains the shared address resource on which the resource group that is being created depends.

-n node-zone-list

Specifies a comma-separated, ordered list of nodes in which this resource group is to be available. The format of each entry in the list is node:zone. In this format, node specifies the node name and zone specifies the name of a global-cluster non-voting node. To specify the global-cluster voting node, or to specify a node without global-cluster non-voting nodes, specify only node.
This list is optional. If you omit this list, the resource group is created on all nodes in the cluster.
The node list of the scalable resource can contain the same list or a subset of nodename:zonename pairs as the node list of the shared address resource

resource-group

Specifies your choice of the name of the scalable resource group to add. This name must begin with an ASCII character.
Verify that the scalable resource group has been created.
```
# clresourcegroup show resource-group
```

Example 2-5 Creating a Scalable Resource Group

This example shows the creation of the scalable resource group resource-group-1. This resource group is to be hosted in the global cluster of nodes phys-schost-1 and phys-schost-2. The scalable resource group depends on the failover resource group resource-group-2, which contains the shared address resources.

# clresourcegroup create\
-p Maximum_primaries=2\
-p Desired_primaries=2\
-p RG_dependencies=resource-group-2\
-n phys-schost-1, phys-schost-2\
resource-group-1

# clresourcegroup show resource-group-1

=== Resource Groups and Resources ===          

Resource Group:                                  resource-group-1
RG_description:                                  <NULL>
RG_mode:                                         Scalable
RG_state:                                        Unmanaged
RG_project_name:                                 default
RG_affinities:                                   <NULL>
Auto_start_on_new_cluster:                       True
Failback:                                        False
Nodelist:                                        phys-schost-1 phys-schost-2
Maximum_primaries:                               2
Desired_primaries:                               2
RG_dependencies:                                 resource-group2
Implicit_network_dependencies:                   True
Global_resources_used:                           <All>
Pingpong_interval:                               3600
Pathprefix:                                      <NULL>
RG_System:                                       False
Suspend_automatic_recovery:                      False

Next Steps

After you have created a scalable resource group, you can add scalable application resources to the resource group. See How to Add a Scalable Application Resource to a Resource Group for details.

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	Oracle Solaris Cluster Data Services Planning and Administration Guide