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Chapter 10. Backing Up and Restoring Cartridges

OpenShift Enterprise provides snapshot and restore features for user applications. These features enable OpenShift Enterprise application developers to:
  • Snapshot the current state of an application to create a backup.
  • Restore an application from an archived state.
  • Copy or rename an application by taking a snapshot, creating a new application, then restoring the snapshot data to the new application.

10.1. Snapshot
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When an application developer runs the rhc snapshot save command, OpenShift Enterprise creates an archive of the application and performs the following steps:
  1. Stops the application by running the gear stop command.
  2. Runs the control pre-snapshot command for each cartridge on the gear. You can control cartridge serialization in the snapshot by implementing the control pre-snapshot command in conjunction with exclusions. For example, you can snapshot to a database dump instead of a database file.
  3. Builds a list of exclusions from the snapshot_exclusions entry in the $cartridge_name/metadata/managed_files.yml file for each cartridge on the gear.
  4. Creates an archive of the application in tar.gz format and writes it to stdout for use by the client tools. In addition to the files listed in the snapshot_exclusions entry in the managed_files.yml file, OpenShift Enterprise excludes the following files:
    • Selected gear user files: .tmp, .ssh, .sandbox.
    • Application state file: app-root/runtime/.state.
    • Bash history file: $OPENSHIFT_DATA_DIR/.bash_history.
  5. Runs the control post-snapshot command for each cartridge on the gear. Use this script to cleanup after the snapshot runs.
  6. Will either stop or start the gear based on the state of the application before the snapshot.
Snapshot Exclusions

Use the optional snapshot_exclusions entry in the $cartridge_name/metadata/managed_files.yml file to list files to exclude from the snapshot and restore process. File patterns originate from the OPENSHIFT_HOMEDIR directory, not the cartridge directory. Do not exclude files that your cartridge requires to operate.

Example 10.1. snapshot_exclusions Entry

snapshot_exclusions:
- mydir/*
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OpenShift Enterprise uses the tar command when performing snapshots. See the tar man page --exclude-from option for more information.
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