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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:
- Stops the application by running the
gear stopcommand. - Runs the
control pre-snapshotcommand for each cartridge on the gear. You can control cartridge serialization in the snapshot by implementing thecontrol pre-snapshotcommand in conjunction with exclusions. For example, you can snapshot to a database dump instead of a database file. - Builds a list of exclusions from the
snapshot_exclusionsentry in the$cartridge_name/metadata/managed_files.ymlfile for each cartridge on the gear. - Creates an archive of the application in
tar.gzformat and writes it tostdoutfor use by the client tools. In addition to the files listed in thesnapshot_exclusionsentry in themanaged_files.ymlfile, 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.
- Runs the
control post-snapshotcommand for each cartridge on the gear. Use this script to cleanup after the snapshot runs. - 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/*
snapshot_exclusions:
- mydir/*
OpenShift Enterprise uses the
tar command when performing snapshots. See the tar man page --exclude-from option for more information.
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