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dockerHow to backup docker volume


We backup data volume from running container by creating second temporary container and making tar archive from what's inside the volume.

docker run -it --mount source=data,destination=/data ubuntu
docker run --rm --volumes-from 804e9d6977ba -v /tmp/data:/backup ubuntu tar czvf /backup/backup.tar.gz /datactrl + c
docker run

run specified image

-it

instantly connects to container command line

--mount

mounts specified volume

source=data

name of the volume to mount (data)

destination=/data

path that the volume will be available from the container

--rm

remove container automatically after it stopped (used for backup container only)

--volumes-from

specify which container to mount volumes from (assume we have running containers to backup from)

804e9d6977ba

id of our first container (to backup volume from)

-v

mount directory for container

/tmp/data:/backup

make local /tmp/data be accessible to container at /backup

tar czvf

creates gzip acrhive

/backup/backup.tar.gz

name of the backup file

/data

which directory to create gzip from (/data is the path of data volume)


Usage example

docker run -it --mount source=data,destination=/data ubuntu
docker run --rm --volumes-from 804e9d6977ba -v /tmp/data:/backup ubuntu tar czvf /backup/backup.tar.gz /data
ls /tmp/data
output
tar: Removing leading `/' from member names
/data/
/data/hello.txt
backup.tar.gz