Upgrading In a Single Cluster

You can perform a rolling upgrade of an application deployed to a single cluster, providing the cluster’s configuration is not shared with any other cluster.

To Upgrade an Application in a Single Cluster

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

   For example:

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

2. Perform the following steps for each server instance in the cluster.
   1. Quiesce one server instance in the cluster from the load balancer.

      Follow these steps:

      1. Disable the server instance 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.

   2. Enable the upgraded application version on the quiesced server instance.

      For example:

      asadmin> asadmin enable --target instance01 myApp:1.1

      Enabling the upgraded application version automatically disables the previous version.

   3. Test the upgraded application on the server instance to make sure it runs correctly.
   4. Re-enable the server instance in load balancer.

      Follow these steps:

      1. Enable the server instance 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.