Technical data

2 Starting and Stopping WebLogic Servers
2-14 Administration Guide
If the Administration Server goes down while Managed Servers continue to run, you
do not need to restart the Managed Servers that are already running in order to recover
management of the domain. The procedure for recovering management of an active
domain depends upon whether you can restart the Administration Server on the same
machine it was running on when the domain was started.
Restarting the Administration Server on the Same Machine
If you restart the WebLogic Administration Server while Managed Servers continue to
run, the Administration Server can detect the presence of the running Managed Servers
if you instruct the Administration Server to perform a discovery. To instruct the
Administration Server to do a discovery of Managed Servers, enter the following
argument on the command line when starting the Administration Server:
-Dweblogic.management.discover=true
The default value of this attribute is true. (If you omit this property, the Administration
Servers still executes the discovery. Make sure, however, that this property is either not
defined or not set to
false in the command line you use to start WebLogic Server.)
The configuration directory for the domain contains a file
running-managed-servers.xml which is a list of the Managed Servers that the
Administration Server knows about. When the Administration Server is instructed to
perform discovery upon startup, it uses this list to check for the presence of running
Managed Servers.
Restart of the Administration Server does not update the runtime configuration of the
Managed Servers to take account of any changes made to attributes that can only be
configured statically. WebLogic Servers must be restarted to take account of changes
to static configuration attributes. Discovery of the Managed Servers does enable the
Administration Server to monitor the Managed Servers or make runtime changes in
attributes that can be configured dynamically.
Restarting the Administration Server on Another Machine
If a machine crash prevents you from restarting the Administration Server on the same
machine, you can recover management of the running Managed Servers as follows:
1. Install the WebLogic Server software on the new administration machine (if this
has not already been done).