weblogic administration tutorials

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weblogic administration tutorials: 

A WebLogic Server domain may consist of one or more WebLogic Servers. WebLogic Server can be started as either an Administration Server or as a Managed Server. One of the WebLogic Servers in a domain must be the Administration Server for the domain. Additional WebLogic Servers in the domain are managed servers. Whether a WebLogic Server is an Administration Server or Managed Server depends on command-line options used when starting the server. The default role for a WebLogic Server is the Administration Server. Therefore, if there is only one WebLogic Server in a domain, that server is the Administration Server. In a multi-server domain, a WebLogic Server becomes a Managed Server. 

If it is instructed to obtain its configuration from a running Administration Server when started. The Administration Server controls access to the configuration for a WebLogic Server domain. It provides other management services such as monitoring and log message browsing. The Administration Server serves up the Administration Console. It provides user access to the management services offered by the Administration Server. When a WebLogic Managed Server is started, it obtains its configuration from the Administration Server. For this reason, booting a multi-server WebLogic Server domain is a two-step procedure. 

First you start the Administration Server, and then you start the Managed Servers. When a WebLogic Server is starting, the normal logging subsystem is not yet available for logging. Accordingly, any errors encountered during startup are logged to stdout. Start a Managed Server remotely from the Administration Console, using the Node Manager. These messages are also displayed in the right pane of the Administration Console. Because the Administration Server contains the configuration repository (config.xml), security files, and application files for your domain. You should keep an archived copy of these files in case failure of Administration Server causes them to become unavailable. 

Common methods of archiving include periodic back-ups, fault tolerant disks, and manually copying files whenever they are changed. Remember that any configuration changes you make to Weblogic Server, either by using the Administration Console, the weblogic. Admin command or the JMX API is persisted in the config.xml file. Provide for quick failover in case of an Administration Server crash or other failure. You may wish to create another instance of the Administration Server. On a different machine that will be ready to use if it the original Administartion Server fails. As long as you have backups of your configuration, security, and application files, you can safely restart the Administration Server on another machine without interrupting the functioning of the Managed Servers. 

Start of WebLogic Administration Server: 

There are several ways in which the WebLogic Administration Server can be started: 

· From the command line 

The command to start the WebLogic Server can be either typed in a command shell manually or it can be placed in a script to avoid retyping the command each time the server is started. For information on the sample scripts provided see starting the WebLogic Managed Servers Using Scripts. 

· From the Start Menu (Windows only) 

A WebLogic Server installed as a Windows service will start automatically when the computer is rebooted. 

Whichever method you choose, the Administration Server must be running when you modify your domain configuration. The Administration Server is the WebLogic Server on which the Administration Service runs. The Administration Service provides the functionality for WebLogic Server, and manages the configuration for an entire domain. 

By default; an instance of WebLogic Server is treated as an Administration Server. When the Administration Server starts, it loads the configuration files, which are stored, by default, in a directory called config under the WEBLOGIC_HOME directory. The config directory has a subdirectory for each domain that is available to the Administration Server. The actual configuration file resides inside the domain-specific directory and is called config.xml. By default, when an Administration Server starts, it looks for the configuration file (config.xml) under the default domain directory which is specified during installation of WebLogic Server software. 

Each time the Administration Server is successfully started, a backup configuration file named config.xml.booted is created in the domain specific directory.In the unlikely event that the config.xml file should become corrupted during the lifetime of the server, it is possible to revert to this previously known, good configuration. A domain could consist of only one WebLogic Server. But in that case, that WebLogic Server would be an Administration Server because each domain must have at least (and at most) one Administration Server. 

Conclusion: 

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