WebLogic Basic Concepts

WebLogic application server has the following basic concepts:

Domain:A domain is a logical concept used to organize and manage a series of application server instances, that is, the server to be explained below. the domain is the largest concept in the WebLogic application server. When the WebLogic application server is started, it starts with a certain domain. It has a central configuration file called config. XML.

A domain is the basic administration unit for WebLogic Server instances (servers) that is represented in its own configuration file (Config. xml). A domain consists of one or more servers (and their associated resources) that you manage with a single administration server.

 

Cluster:It is also a logical concept used to group server instances for the same purpose. A domain can have multiple families.

A cluster is a deployment in which multiple WebLogic Server instances (servers) run simultaneously and work together to provide increased scalability and reliability. A cluster appears to clients to be a single Weblogic server instance. the servers that constitute a cluster can run on the same machine, or be located on different machines.

 

MACHINE:A machine is a physical concept that represents a real machine running the WebLogic application server, including its IP address and other information. A domain can contain multiple machines. (Can a single machine belong to different domains ?)

A machine is the logical representation of the computer that hosts one or more WebLogic Server instances (servers ). webLogic Server uses configured machine names to determine the optimum server in a cluster to which certain tasks, such as HTTP session replication, are delegated. the Administration Server uses the machine definition in conjunction with the Node Manager application to start remote servers.

 

Server:Server, that is, an application server instance, which is used to deploy and run various J2EE applications. You can also configure various service programs. It is the basic service unit of WebLogic application server. A WebLogic domain generally has one management server and multiple managed servers. That is, the two concepts we will talk about below.

A server is an instance of Weblogic server that runs in its own Java Virtual Machine (JVM) and has its own configuration. each WebLogic Server domain must have one server that acts as the Administration Server. in a typical production environment, the Administration Server is where the Administration Console is run and used to perform administrative tasks. by default, the Administration Server is calledMyserver. A typical production environment may also have one or more managed servers, which are instances of Weblogic server used to host enterprise applications.

 

Administrative Server:The Management Server is used to manage the central point of the configuration domain. Generally, the management server does not deploy applications, it is used to centrally manage, configure, monitor managed servers, and deploy applications on managed servers. A domain has a management server.

 

Managed Server:Managed servers are used to deploy and run various applications. One or more managed servers in a domain.

 

Node Manager:The Node Manager is a separate background program that runs on the managed server machine. It is used to remotely start and stop the server.