volume-backup

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. See Miscellaneous for instructions.

Backup

To standard output

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.

WARNING: This method should not be used with a Docker for Windows installation; no usable backup will be generated.

To a file

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.

Restore

WARNING: This operation will delete all contents of the volume

Restore from standard input

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.

WARNING: This method should not be used with a Docker for Windows installation; no usable backup will be generated.

From a file

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.

Miscellaneous

1. Upgrade / update volume-backup

   docker pull loomchild/volume-backup
   

2. Find all containers using a volume (to stop them before backing-up)

   docker ps -a --filter volume=[volume-name]
   

3. Exclude some files from the backup and send the archive to stdout

   docker run -v [volume-name]:/volume --rm loomchild/volume-backup backup -e [excluded-glob] - > [archive-name]