RECAP : WLS Basic Concepts

Let's revisit WLS Basic concepts:

• The basic administrative unit for a WLS is called a DOMAIN. Its just a logical unit.

• A domain is a logically related group of WebLogic Server resources that you manage as a unit.

• Each Domain includes only one instance of weblogic server called ADMINSTRATION SERVER. Admin server is the SPOC for all instances running on that domain and for system administration.

• Domain may also include additional WLS instances called MANAGED SERVERS. Within a domain some or all of the Managed Servers may be part of the cluster.

• A Managed Server can also function as a virtual host.

• A CLUSTER is a group of WebLogic Server instances that work together to provide scalability and high-availability for applications.

• A Managed Server in a cluster can act as a backup for services such as JMS and JTA that are hosted on another server instance in the cluster.

• All applications are also deployed and managed as part of a domain.

• There are two startup modes available for domains, i.e. DEVELOPMENT or PRODUCTION.

• As the name suggests,development mode is used while developing applications. Development mode uses a relaxed security configuration and has auto-deploy option for applications deployment.

• Production mode used when application is running in its final form.

• Startup mode details are stored in config.xml file