Recognize the various institutions in WebLogic

I. Recognize the various institutions in the WebLogic

WebLogic is an enterprise-class application server, including various applications in the Java EE, is a JSP,SERVLET,EJB container. Powerful, in order to more convenient management of the various functions of weblogic, logically, the WebLogic is divided into "Domain" and exist. A weblogic can have more than one domain. In each domain, also according to the different needs, have their own division. Look first.

As can be seen in the figure, a domain has: machine,server, Cluster. What exactly are they doing?

Ii. the role of the various institutions

1, Domains (domain)
Domain is the basic unit of WebLogic Management and is a set of interrelated resources, so domain must contain one or more servers, but there is a unique as (Administrator server) management.
Domain is used to divide different applications or differentiate different phases of the same application (development, testing, production).
Domain plays a role in applying logical partitioning, and with domain you can deploy the same two applications to two different domain.

Multiple servers can be managed from a single point

2, Machines

The physical hardware on which the server resides can make UNIX or non-UNIX systems. You can have one or more server instances on a separate machine.

3. Server

An instance of Java class Weblogic.server executed in a Java Virtual machine (JVM) is associated with at most one machine in WebLogic server, that is, there can be more than one server in a machine. There is some dedicated RAM, and it is multithreaded.

3.1. Administration Server (AS, manager)

As is the most right in the server, is the control center of domains;
Is the custodian of the XML configuration library;

The central source of the log information.

3.2 Managed Server (managed server, MS)

Remotely loading its configuration from administration server, managed by as

4, Cluster Cluster

Work together through a set of server instances, replicating the ability to apply presentation and application logic tiers across multiple machines, achieving load distribution across critical business systems, and eliminating individual points of failure for load balancing and fault tolerance. (PS: But you must run the same WebLogic Server version)
The cluster works as if it were a separate WebLogic server instance. The cluster can be run on the same machine or on a different machine, but a cluster is part of WebLogic Server domain and cannot span domains.

If necessary, you can increase the processing power of cluster by adding a new instance of WebLogic Server.