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10.2. Restore
When an application developer runs the
rhc snapshot restore command, OpenShift Enterprise restores the application from an archive in the following steps:
- Prepares the application for restoration.
- If the archive contains a Git repository, OpenShift Enterprise runs the
gear pre-receivecommand. - If the archive does not contain a Git repository, OpenShift Enterprise runs the
gear stopcommand.
- Runs the
control pre-restorecommand for each cartridge on the gear. This enables you to control the restoration of your cartridge, for example by deleting an old database dump. - Builds a list of file name changes to apply during the restoration from the
restore_transformsentry in the$cartridge_name/metadata/managed_files.ymlfile for each cartridge on the gear. - Extracts the archive into the gear user's home directory, overwriting existing files and applying the file name changes listed in the
restore_transformsentry in themanaged_files.ymlfile. - Runs the
control post-restorecommand for each cartridge on the gear. Use this script to load a database flat file into the running database. - Resumes the application.
- If the archive contains a Git repository, OpenShift Enterprise runs the
gear postreceivecommand. - If the archive does not contain a Git repository, OpenShift Enterprise runs the
gear startcommand.
- Will either stop or start the gear based on the state of the application before restoring.
Restoring with Transformed File Names
Use the optional restore_transforms entry in the $cartridge_name/metadata/managed_files.yml file to provide scripts that transform file names when OpenShift Enterprise restores an application. This entry enables you to restore older snapshots to a newer cartridge with file name changes.
Example 10.2. restore_transforms Entry
restore_transforms:
- s|${OPENSHIFT_GEAR_NAME}/data|app-root/data|
restore_transforms:
- s|${OPENSHIFT_GEAR_NAME}/data|app-root/data|
OpenShift Enterprise uses the
tar command when restoring a gear. See the tar man page --transform option for more information.
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