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Sun Cluster 3.0 12/01 Data Services Installation and Configuration Guide

Registering and Configuring Sun Cluster HA for DNS

This procedure describes how to use the scrgadm(1M) command to register and configure Sun Cluster HA for DNS.

Note -

Other options also enable you to register and configure the data service. See "Tools for Data Service Resource Administration" for details about these options.

How to Register and Configure Sun Cluster HA for DNS

To perform this procedure, you need the following information about your configuration.

Note -

Perform this procedure on any cluster member.

  1. Become superuser on a cluster member.

  2. Register the resource type for the data service.


    # scrgadm -a -t SUNW.dns
    -a

    Adds the data service resource type.

    -t SUNW.dns

    Specifies the predefined resource type name for your data service.

  3. Create a resource group for network and DNS resources to use.

    You can use the -h option to optionally select the set of nodes on which the data service can run.


    # scrgadm -a -g resource-group [-h nodelist]
    -g resource-group

    Specifies the name of the resource group. This name can be your choice but must be unique for the resource groups within the cluster.

    [-h nodelist]

    Specifies an optional comma-separated list of physical node names or IDs that identify potential masters. The order here determines the order in which the nodes are considered as primary during failover.

    Note -

    Use the -h option to specify the order of the node list. If all of the cluster nodes are potential masters, you do not need to use the -h option.

  4. Verify that all of the network resources that you will use have been added to your name service database.

    You should have performed this verification during the Sun Cluster installation. See the planning chapter in the Sun Cluster 3.0 12/01 Software Installation Guide for details.

    Note -

    To avoid any failures because of name service lookup, verify that all of the network resources are present in the server's and client's /etc/hosts file. Configure name service mapping in the /etc/nsswitch.conf file on the servers to first check the local files before trying to access NIS or NIS+.

  5. Add network resources to the resource group.

    For example, run the following command to add a logical hostname to a resource group.


    # scrgadm -a -L -g resource-group -l logical-hostname [logical-hostname] \
[-n netiflist]
    -l logical-hostname

    Specifies a comma-separated list of network resources (logical hostname or shared address).

    -n netiflist

    Specifies an optional, comma-separated list that identifies the NAFO groups on each node. All of the nodes in nodelist of the resource group must be represented in the netiflist. If you do not specify this option, the scrgadm command attempts to discover a net adapter on the subnet that the hostname list identifies for each node that is in nodelist. For example, -n nafo0@nodename, nafo0@nodename2.

  6. Add a DNS application resource to the resource group.


    # scrgadm -a -j [resource] -g resource-group \
-t SUNW.dns -y Network_resources_used=network-resource, ...\
-y Port_list=port-number/protocol -x DNS_mode=config-file \ 
-x Confdir_list=config-directory
    -j resource

    Specifies the DNS application resource name.

    -t SUNW.dns

    Specifies the name of the resource type to which this resource belongs. This entry is required.

    -y Network_resources_used=network-resource, ...

    Specifies a comma-separated list of network resources (logical hostnames or shared addresses) that DNS will use. If you do not specify this property, the value defaults to all of the network resources that are contained in the resource group.

    -y Port_list=port-number/protocol

    Specifies a port number and the protocol to be used. If you do not specify this property, the value defaults to 53/udp.

    -x DNS_mode=config-file

    Specifies the configuration file to use, either conf(named.conf) or boot(named.boot). If you do not specify this property, the value defaults to conf.

    -x Confdir_list=config-directory

    Specifies the location of the DNS configuration directory paths, which must be on the cluster file system. Sun Cluster HA for DNS requires this extension property.

  7. Run the scswitch(1M) command to complete the following tasks.

    • Enable the resource and fault monitoring.

    • Move the resource group into a managed state.

    • Bring the resource group online.


    # scswitch -Z -g resource-group
    -Z

    Enables the resource and monitor, moves the resource group to the managed state, and brings the resource group online.

    -g resource-group

    Specifies the name of the resource group.

Example - Registering Failover Sun Cluster HA for DNS

The following example shows how to register Sun Cluster HA for DNS on a two-node cluster. Note that at the end, the scswitch command starts Sun Cluster HA for DNS.


Cluster Information
Node names: phys-schost-1, phys-schost-2
Logical hostname: schost-1
Resource group: resource-group-1 (for all of the resources), 
Resources: schost-1 (logical hostname), dns-1 (DNS application
    resource)

(Register the DNS resource type.)
# scrgadm -a -t SUNW.dns
 
(Add the resource group to contain all of the resources.)
# scrgadm -a -g resource-group-1
 
(Add the logical hostname resource to the resource group.)
# scrgadm -a -L -g resource-group-1 -l schost-1 
 
(Add DNS application resources to the resource group.)
# scrgadm -a -j dns-1 -g resource-group-1 -t SUNW.dns \
-y Network_resources_used=schost-1 -y Port_list=53/udp \
-x DNS_mode=conf -x Confdir_list=/global/dns
 
(Bring the failover resource group online.)
# scswitch -Z -g resource-group-1

How to Configure SUNW.HAStorage Resource Type

The SUNW.HAStorage resource type synchronizes actions between HA storage and the data service. Sun Cluster HA for DNS is not disk intensive and is not scalable, and therefore setting up the SUNW.HAStorage resource type is optional.

See the SUNW.HAStorage(5) man page and "Relationship Between Resource Groups and Disk Device Groups" for background information. See "How to Set Up SUNW.HAStorage Resource Type for New Resources" for the procedure.