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For complete documentation of the J2EE 1. For a complete list of supported platforms, see the Web references list in the Appendix. In this chapter, we look at how IBM packages the product in Version 6 and examine the architectures associated with each variation.
Chapter 2 gives you an overview of the installation and configuration process and provides an introduction to the rest of the book. WebSphere Application Server V6 — Express — The Express package provides a fully functional, affordable, and easy-to-use Java application server and development environment.
WebSphere Application Server V6 — In addition to the functionality supported by the Express runtime, the base application server product — what we call the Base package in this book — delivers high performance and a highly scalable transaction engine for dynamic e-business applications.
The Base package provides the same functionality as the Express package, but an expanded license agreement supports the ability to federate i. Figure illustrates the relationship among the Base, Express, and Network Deployment packages.
WebSphere Application Server V6 — Extended Deployment — Installed on top of the Network Deployment package, the Extended Deployment XD package the Network Deployment package, the Extended Deployment XD package helps customers with multiple mission-critical and complex applications improve availability and performance by balancing and sharing the workload of multiple application server nodes and clusters to provide on-demand computing.
Figure depicts the software products that come with the Express and Base versions of WebSphere Application Server. These two packages include essentially the same set of software the development tool provided is the only difference. Standalone application server node with support for multiple instances.
Application client. Web server plug-ins. These packages are built of the same code base and therefore are identical in terms of features and functions.
The difference between the two packages is simply a licensing issue. To be able to federate an application server node to a WebSphere cell, you must have a paper agreement; only the Base package permits use of this feature.
Deployment Manager. IBM Cloudscape database. The key additional features provided in the Network Deployment package are support for workload management, high availability, and clustering and the ability to run the Web server as a managed node. This feature is not available with other supported Web servers. The heart of a WebSphere Application Server installation is the application server itself. The application server provides a runtime environment in which to deploy, manage, and run J2EE applications.
Both the Base and Express packages support a standalone application server structure. Figure illustrates the components of this basic architecture, which forms the foundation of every WebSphere Application Server installation.
As you can see in the diagram, the application server process contains the following services and containers:. Admin server — The administrative server maintains and manages the administration configuration repository which consists of Extensible Markup Language, or XML, flat files in the file system.
The admin server accepts requests from the WebSphere administrative console a browser-based graphical interface for configuring and managing WebSphere resources and wsadmin commands and changes the configuration information accordingly.
These artifacts are typically packaged as a Web module and run inside the Web container. A Web module is packaged as a file with a. Files with. The embedded server can serve all static content, just like an external HTTP server. Web services engine — The Web services engine is the part of the application server runtime that supports Web services.
Web services are self-contained, modular applications that you can describe, publish, locate, and invoke over a network. An EJB module is packaged as a file with a. Files with a. The client container depicted in the figure provides services for running standalone Java clients that use the application server. You invoke the client application container by executing the launchClient command. J2C service — The Java 2 Connector J2C service provides connections between J2EE applications running inside the application server and applications running in legacy enterprise information systems.
Connections and their runtime environment are pooled and managed as defined in the J2EE 1. Client applications can then obtain the references to these resource objects in their programs. To enable the messaging engine in the application server process default messaging provider with WebSphere V6 , you create an SIBus and attach the application server to it as a member.
This messaging engine is all-Java based and runs in-process with the application server. In this book, we cover use of the default messaging engine only. Security server — The security server provides authentication and authorization services. Notice that Figure depicts the application server as enclosed within a profile. A profile contains a set of files that enable the runtime environment for a WebSphere server process.
You create a profile for the application server during the installation process. The Network Deployment package supports two additional profile types, deployment manager and custom, both of which we describe later. As the diagram in Figure illustrates, when you install the WebSphere V6 package, the installation program copies to a directory on the server machine the product binaries, which include a default application server template and other files required to create a profile.
When you create an application server profile, an application server named server1 is created by default, and necessary applications are deployed on it to help manage the configuration adminconsole, filetransfer and verify the installation default application, installation verification test. You can use the same set of product binaries and template to create multiple profiles.
If you desire, you can create multiple application servers e. But for easy maintenance, you may want to create a new profile an application server process gets created with a profile if you ever expect to have multiple application servers. The server contains the following services:. When a Web application user sends a request, the external HTTP server processes the request first here we are assuming that the plug-in module is not installed and configured to run with the HTTP server.
If the request is for static content only, the HTTP server can serve it. In this case, the HTTP server needs to know where and how to divert the request. The plug-in module uses an XML-based file containing a request-routing table to divert requests to the appropriate application server. If the request is for dynamic content, the plug-in diverts the request to the WebSphere application server.
If the request is for static content, the plug-in forwards it to the HTTP server. In this section, we review a few possibilities to give you a general idea of how you might build a WebSphere V6 system. You can create any of the architectural variations described here and others by following the steps given in Chapters 3 through 6.
Figure illustrates this architecture. You can use this type of configuration for noncritical, small production or test environments. Figure Single WebSphere V6 install: Multiple profiles with local or remote plug-in architecture. In this setup, the plug-in module can be local or remote. You can use this configuration to host different applications as follows:. Of course, you can also have multiple installations of WebSphere V6 multiple binary files on a single machine, each with multiple profiles.
Figure illustrates this limitation. If you need this kind of capability i. The figure shows a WebSphere cell that consists of two nodes: node A and node B. Each node is a collection of WebSphere managed server processes application server, Web server, generic server, and so on. Nodes in a cell can be managed or unmanaged. Many people wrongly think that a one-to-one relationship exists between a WebSphere node and a physical machine which is sometimes also called a node. But in a WebSphere cell, a single physical machine can contain multiple WebSphere nodes.
Within each cell, the Deployment Manager process, as its name implies, is responsible for managing the administrative configuration for the entire cell. In the Network Deployment environment, the WebSphere administrative console connects to the Deployment Manager to work with the cell configuration. You thus have a centralized, single point of administration for all the nodes in a cell. Each node will contain one or more application servers.
Every WebSphere node that has been federated to the Deployment Manager contains one node agent. The node agent is responsible for propagating administration configuration changes from the Deployment Manager to its node.
A managed node contains a node agent on that node. A cluster shown in node B of the figure is a collection of application server processes hosting an identical collection of J2EE applications, thus providing workload management and high availability.
The architecture depicted in the figure has a limitation, though. If the entire node B goes down, the applications running in the cluster are unavailable entirely. To maintain high availability during system failover, it would be wise to move a cluster to node A or create an extra cluster member there. A new feature in WebSphere V6 is the ability to group nodes within a cell for better manageability. In such an environment, support for node groups lets you organize nodes by operating system or platform.
As you learned earlier, a WebSphere profile contains a set of files that enable a runtime environment for a WebSphere server process. The WebSphere V6 Base and Express packages support one kind of profile, an application server profile.
In addition to the application server profile, the WebSphere V6 Network Deployment package supports two more profile types: deployment manager and custom. As Figure illustrates, when you install the Network Deployment package, the installation program copies product binaries containing three kinds of templates — deployment manager, application server default , and custom managed — along with the files required to create the associated profiles.
You can create multiple profiles from the same set of product binaries for each profile template. When you create an application server profile, an application server process server1 is created by default, along with the set of files required to run and manage that application server server1.
When you create a deployment manager profile, a Deployment Manager process dmgr is created by default, along with the necessary applications to manage the configuration adminconsole, filetransfer and verify the installation ivt. The Deployment Manager helps the administrator manage multiple application servers and clusters that exist on one or more nodes.
Unlike the application server profile, a custom profile contains no application server or applications that manage and verify the configuration immediately after its creation. A custom profile is equivalent to the application server profile minus the application server process server1.
WebSphere Application Server Step by Step
For complete documentation of the J2EE 1. For a complete list of supported platforms, see the Web references list in the Appendix. In this chapter, we look at how IBM packages the product in Version 6 and examine the architectures associated with each variation. Before concluding the chapter, we'll review some of the significant new features in V6, including administrative console improvements, high-availability features, and deployment and management enhancements. Chapter 2 gives you an overview of the installation and configuration process and provides an introduction to the rest of the book. The Base package provides the same functionality as the Express package, but an expanded license agreement supports the ability to federate i. You'll learn more about WebSphere nodes and cells later in this chapter.
WebSphere Application Server: Step by Step
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