How to Update Network Time Protocol (NTP)

Perform this task on each node.

1. Become superuser on the cluster node.

2. Edit the /etc/inet/ntp.conf file.

   The scinstall(1M) command copies a template file, ntp.cluster, to /etc/inet/ntp.conf as part of standard cluster installation. But if an ntp.conf file already exists before Sun Cluster software is installed, that existing file remains unchanged. If cluster packages are installed by using other means, such as direct use of pkgadd(1M), you need to configure NTP.

   1. Remove all entries for private hostnames that are not used by the cluster.

      If the ntp.conf file contains non-existent private hostnames, when a node is rebooted, error messages are generated on the node's attempts to contact those private hostnames.

   2. If you changed any private hostnames after Sun Cluster software installation, update each file entry with the new private hostname.

   3. If necessary, make other modifications to meet your NTP requirements.

      The primary requirement when configuring NTP, or any time synchronization facility, within the cluster is that all cluster nodes be synchronized to the same time. Consider accuracy of time on individual nodes secondary to the synchronization of time among nodes. You are free to configure NTP as best meets your individual needs, as long as this basic requirement for synchronization is met.

      Refer to Sun Cluster 3.0 Concepts for further information about cluster time and to the ntp.cluster template for guidelines on configuring NTP for a Sun Cluster configuration.

3. Restart the NTP daemon.

   # /etc/init.d/xntpd stop # /etc/init.d/xntpd start

Where to Go From Here

If you want to use the Sun Management Center product to configure resource groups or monitor the cluster, go to "Installation Requirements for Sun Management Center Software for Sun Cluster Monitoring".

Otherwise, to install third-party applications, refer to the documentation supplied with the application software and to Sun Cluster 3.0 Data Services Installation and Configuration Guide. To register resource types, set up resource groups, and configure data services, refer to Sun Cluster 3.0 Data Services Installation and Configuration Guide.