About DNS update

Article:HOWTO60430  |  Created: 2011-10-20  |  Updated: 2012-02-03  |  Article URL http://www.symantec.com/docs/HOWTO60430
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About DNS update

The FileStore DNS update feature enables users to update DNS records so that clients can be served from a different cluster. This feature is useful in failover situations where an active FileStore cluster must be brought down and the services moved to the backup cluster.

Consider the scenario shown in Figure: Active and backup clusters. In this example, there are two FileStore clusters (Cluster 1 and Cluster 2). Cluster 1 is the active cluster. Cluster 2 is the "backup" cluster, the cluster that can run services when Cluster 1 is brought down. Data is kept in synchronization between the two clusters using the FileStore replication feature. However, at any given time, the DNS server stores resource records for only one cluster.

In previous releases, DNS updates had to be done manually when cluster operations were switched form one cluster to another. Now, you can use FileStore DNS update commands to update the DNS server. The DNS update feature is supported for UNIX and Linux-based DNS servers only. Windows-based DNS servers are not supported.

Figure: Active and backup clusters

Active and backup clusters

By default, the DNS update service is offline. To use the DNS update service, first use the DR> dnsupdate set command to configure the DNS update service parameters, then use the DR> dnsupdate start command to start the service.

Table: DNS update commands

Command

Description

dnsupdate show

Shows the configuration settings for DNS update. Configuration settings include the DNS server name, DNS domain name, key file location, and so on. This command also shows the status of the DNS update service on the local and the remote clusters.

See Displaying DNS update settings.

dnsupdate start

Starts the DNS update service on the local cluster and uploads cluster-specific information to the DNS server. Any new clients are served from the cluster where the command was issued.

See Starting and stopping the DNS update service.

dnsupdate stop

Stops the DNS update service on the local cluster. DNS information for the local cluster is removed from the DNS server. When the DNS update service is stopped on the local cluster, new clients are served from the "backup" cluster, provided the DNS update service has been started on the backup cluster.

See Starting and stopping the DNS update service.

dnsupdate set

Configures the DNS update service parameters.

See About the DNS update set command.


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