Perform controlled failover of SIP applications

 

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Overview

You can take an active application out of the loop via a controlled failover.

SipContainerMBean is used to initiate a server quiesce through wsadmin. This MBean is used to set the container’s weight to 0, which prevents new messages from being routed it.

WAS PMI is used to monitor the server’s active sessions. The remaining active sessions can be watched by enabling a counter on the server being quiesced. The server can be shut down once the number of active sessions reaches an acceptable level. A script can be written to monitor active sessions and shut down the server when an acceptable threshold is achieved.

 

Quiescing a single server

1. On an ND machine, start the wsadmin utility:

   1. Go to <nd_installation_path>/bin

   2. Run...

      ./setupCmdLine.sh
      ./wsadmin.sh

   3. Verify that received: wsadmin>

2. Run...

   set scBean [$AdminControl queryNames type=SipContainerMBean,process=<server name>,*]
   $AdminControl invoke $scBean quiesce true

3. Use the following commands to stop appservers from the admin console, command line or scripts:

   • Stop

     Quiesces the appserver. The sessions will failover to another server. It is important to manually quiesce the server on shutdown.

   • Immediate Stop

     Stops the server, but bypasses the normal server quiesce process that supports in-flight requests to complete before shutting down the entire server process. This shutdown mode is faster than the normal server stop processing, but some application clients can receive exceptions.

   • Terminate

     Deletes the application server process. Use this if immediate stop fails to stop the server.

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