An utility to backup and restore docker volumes.
Note: Make sure no container is using the volume before backup or restore, otherwise your data might be damaged.
Syntax:
docker run -v [volume-name]:/volume -v [output-dir]:/backup --rm loomchild/volume-backup backup [archive-name]
For example:
docker run -v some_volume:/volume -v /tmp:/backup --rm loomchild/volume-backup backup some_archive
will archive volume named some_volume to /tmp/some_archive.tar.bz2 archive file.
This avoids mounting a second backup volume and allows to redirect it to a file, network, etc.
Syntax:
docker run -v [volume-name]:/volume --rm loomchild/volume-backup backup - > [archive-name]
For example:
docker run -v some_volume:/volume --rm loomchild/volume-backup backup - > some_archive.tar.bz2
will archive volume named some_volume to some_archive.tar.bz2 archive file.
Note: This operation will delete all contents of the volume
Syntax:
docker run -v [volume-name]:/volume -v [output-dir]:/backup --rm loomchild/volume-backup restore [archive-name]
For example:
docker run -v some_volume:/volume -v /tmp:/backup --rm loomchild/volume-backup restore some_archive
will clean and restore volume named some_volume from /tmp/some_archive.tar.bz2 archive file.
This avoids mounting a second backup volume.
Note: Don't forget the -i switch for interactive operation.
Syntax:
cat [archive-name] | docker run -i -v [volume-name]:/volume --rm loomchild/volume-backup restore -
For example:
cat some_archive.tar.bz2 | docker run -i -v some_volume:/volume --rm loomchild/volume-backup restore -
will clean and restore volume named some_volume from some_archive.tar.bz2 archive file.