You can combine both approaches: docker run -volumes-from dbdata -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata If you have some persistent data that you want to share between containers, or want to use from non-persistent containers, it’s best to create a named Data Volume Container, and then to mount the data from it. ![]() A host directory wouldn’t be available on all potential hosts. For this reason, you can’t mount a host directory from Dockerfile because built images should be portable. The host directory is, by its nature, host-dependent. It is because, as mentioned in " Mount a host directory as a data volume" Is it any different from having the data in a folder mounted using -v /path/to/data/in/container:/home/user/a_good_place_to_have_data? To mount secrets into a service’s containers. For instance, internally, swarm services use tmpfs mounts Of the container, to store non-persistent state or sensitive It can be used by a container during the lifetime Use Docker CLI commands to directly manage bind mounts.Ī tmpfs mount is not persisted on disk, either on the Docker host or If you are developing newĭocker applications, consider using named volumes instead. Performant, but they rely on the host machine’s filesystem having a It is created on demand if it does not yet exist. Theįile or directory does not need to exist on the Docker host already. Or directory is referenced by its full path on the host machine. Or directory on the host machine is mounted into a container. Bind mounts have limitedįunctionality compared to volumes. Store your data on remote hosts or cloud providers, among otherĪvailable since the early days of Docker. Volumes also support the use of volume drivers, which allow you to Named and anonymous volumes behave in the same ways. Guaranteed to be unique within a given Docker host. Into a container, so Docker gives them a random name that is Volumes are not given an explicit name when they are first mounted When you mount a volume, it may be named or anonymous. Unused volumes using docker volume prune. When no running container is using a volume, the volume is stillĪvailable to Docker and is not removed automatically. The way that bind mounts work, except that volumes are managed byĭocker and are isolated from the core functionality of the hostĪ given volume can be mounted into multiple containers simultaneously. When you mount the volume into a container, thisĭirectory is what is mounted into the container. When you create a volume, it is stored within a directory on theĭocker host. Using the docker volume create command, or Docker can create a volume You have to use temporary containers with a bind mount to create backups.Ĭreated and managed by Docker. Docker doesn't provide any command to backup volumes. A new volume’s contents can be pre-populated by a container.Īccording to comment, Bind mounts are much easier to backup.Volume drivers allow you to store volumes on remote hosts or cloud providers, to encrypt the contents of volumes, or to add other functionality.Volumes can be more safely shared among multiple containers.Volumes work on both Linux and Windows containers. ![]() You can manage volumes using Docker CLI commands or the Docker API.Volumes are easier to back up or migrate than bind mounts.With Volume, a new directory is created within Docker's storage directory on the host machine, and Docker manages that directory's content.The file or directory is referenced by its full or relative path on the host machine. ![]() With Bind Mount, a file or directory on the host machine is mounted into a container.Although using volumes and bind mounts feels the same (with the only change being the location of the directory), there are differences in behavior.
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