9.7. Upgrading Ant Bundles
The bundle upgrade process decides whether to upgrade (meaning, overwrite) files within the application's deployment directory by comparing the MD5 hash codes on the files. There are several different upgrade scenarios:
- If the hash code on the new file is different than the original file and there are no local modifications, then JBoss ON installs the new file over the existing file.
- If the hash code on the new file is different than the original file and there are local modifications, then JBoss ON backs up the original file and installs the new file.
- If the hash code on the new file and the original file is the same and there are local modifications on the original file, then the provisioning process preserves the original file, in place.
- If there was no file in the previous bundle but there is one in the new bundle, then the new file is used and any file that was added manually is backed up.
Backed up files are saved to a
backup/ directory within the deployment's destination directory. If the original file was located outside the application's directory (like, it was stored according to an absolute location rather than a relative location), then it is saved in an ext-backup/ directory within the deployment's destination directory.
Note
If a file is ignored in the recipe, then the file is left unchanged. Never ignore files packaged in the bundle. Only files generated by the applications, such as log and data files, should be ignored by the provisioning process since they should be preserved for the upgraded instance.
If a completely fresh installation is required, then it is possible to run a clean deployment. This is described in Section 9.5, “Deploying a Bundle to a Clean Destination”.
