Upgrading in Multiple Clusters

To Upgrade a Compatible Application in Two or More Clusters

Repeat the following procedure for each cluster.

1. Deploy the upgraded application to one cluster in a disabled state and with a new version identifier.

   For example:

   asadmin> asadmin deploy --enabled=false --target myCluster myApp:1.1

2. Quiesce the cluster with the upgraded application from the load balancer.
   1. Disable the cluster using asadmin disable-http-lb-server.
   2. Export the load balancer configuration file using asadmin export-http-lb-config.
   3. Copy the exported configuration file to the web server instance’s configuration directory.

      For example, for Sun Java System Web Server, the location is web-server-install-dir/https-host-name/config/loadbalancer.xml.

   4. Wait until the timeout has expired.

      Monitor the load balancer’s log file.

3. Enable the upgraded application version on the quiesced cluster.

   For example:

   asadmin> asadmin enable --target myCluster myApp:1.1

   Enabling the upgraded application version automatically disables the previous version.

4. Test the upgraded application on the cluster to make sure it runs correctly.
5. Enable the cluster in the load balancer:
   1. Enable the cluster using asadmin enable-http-lb-server.
   2. Export the load balancer configuration file using asadmin export-http-lb-config.
   3. Copy the configuration file to the web server’s configuration directory.