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4. Extended Example: Common Provisioning Use Cases (and How They Handle Files)

Section 2, “An Introduction to Provisioning Content Bundles” describes the different elements in the bundles and provisioning system — but what is provisioning really for? There are a handful of common use cases that illustrate how provisioning works in a real environment.
  • Deploying a full application server
  • Deploying a web application to an application server
  • Deploying configuration files

Important

One thing to remember for all of this is that bundles take content from point A (JBoss ON) and send it to point B (the destination). This is not a simple copy operation (Section 2.3, “File Handling During Provisioning”). The provisioning system, by default, makes the destination, point B, match exactly how the directory in the bundle is laid out. This means adding or editing files, creating or deleting subdirectories, and deleting any existing content from the destination.
That concept of managing the layout and content of the destination influences the ways and effects of deploying content.

4.1. Deploying A Full Application Server
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Bundle Details

This is the core use for the provisioning system, deploying an entire application server. This bundle contains the complete configuration stack for a server like JBoss EAP (or Tomcat or Apache). The bundle contains all of the files used by the application — the JAR and configuration files and scripts for the EAP server, and all EAR or WAR web applications that are to be deployed on that EPA instance. All of the application server and web app files and directories are zipped into an archive, with the deploy.xml which defines the Ant recipe.

File Handling Details

Because this is a complete application server, it will be deployed into its own, new (or empty) directory, such as /opt/my-application. That directory will be dedicated to the application server, so it will be entirely managed by the bundle.

There is an attribute in the recipe called manageRootDir which tells the bundle system how to deploy content. For deploying a full application server, the bundle system should have complete control over the directory, so manageRootDir is set to true. This means:
  • Only files and subdirectories in the bundle distribution file will be in the root directory.
  • Any existing files or subdirectories will be deleted.
  • If files or subdirectories are added to the root directory, then they will be deleted when the bundle is updated or redeployed, unless those files are explicitly ignored (a setting in the recipe).
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