WebSphere Application Server Terminology

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The following terms describe elements in WebSphere Application Server configurations:

cell
The administrative domain that a Deployment Manager manages. A cell is a logical grouping of nodes that enables common administative activities in a WebSphere Application Server distributed environment. A cell can have one or many clusters.
node
A node is a logical group of one or more application servers on a physical computer. The node name is unique within the cell. A node name usually is identical to the host name for the computer. That is, a node usually corresponds to a physical computer system with a distinct IP address.
application server
The application server is the primary component of WebSphere. The server runs a Java virtual machine, providing the runtime environment for the application's code. The application server provides containers that specialize in enabling the execution of specific Java application components.
Network Deployment Manager
The administrative process used to provide a centralized management view and control for all elements in a WebSphere Application Server distributed cell, including the management of clusters. The Network Deployment Manager is responsible for the contents of the repositories on each of the nodes. The Network Deployment Manager manages this through communication with node agent processes on each node of the cell.
node agent
A node agent manages all managed processes on a WebSphere Application Server on a node by communicating with the Network Deployment Manager to coordinate and synchronize the configuration. A node agent performs management operations on behalf of the Network Deployment Manager. The node agent represents the node in the management cell. Node agents are installed with WebSphere Application Server base, but are not required until the node is added to a cell in a Network Deployment environment.
cluster
A logical grouping of one or more functionally identical application server processes. A cluster provides ease of deployment, configuration, workload balancing, and fallback redundancy. A cluster is a collection of servers working together as a single system to ensure that mission-critical applications and resources remain available to clients.

Clusters provide scalability. For more information, refer to additional documentation that customer support may provide that describes vertical and horizontal clustering in the WebSphere Application Server distributed environment.

cluster member
An instance of a WebSphere Application Server in a cluster.
WebSphere Web Server plug-in
The WebSphere Web Server plug-in is a component installed onto an HTTP server to take incoming requests and transport them to the appropriate Web container in a cluster. The behavior of the plug-in is governed by the plugin-cfg.xml file. The plug-in allows the Web server to communicate requests for dynamic content, such as servlets, to the application server.
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