docker data volume vs mounted host directory

Question

We can have a data volume in docker:

$ docker run -v /path/to/data/in/container --name test_container debian $ docker inspect test_container ... Mounts": [     {         "Name": "fac362...80535",         "Source": "/var/lib/docker/volumes/fac362...80535/_data",         "Destination": "/path/to/data/in/container",         "Driver": "local",         "Mode": "",         "RW": true     } ] ... 

But if the data volume lives in /var/lib/docker/volumes/fac362...80535/_data, 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?

Answer 1

Although using volumes and bind mounts feels the same (with the only change being the location of the directory), there are differences in behavior.

Volumes vs Bind Mounts

• With Bind Mount, a file or directory on the host machine is mounted into a container. The file or directory is referenced by its full or relative path on the host machine.
• With Volume, a new directory is created within Docker's storage directory on the host machine, and Docker manages that directory's content.

Volumes advantages over bind mounts:

• Volumes are easier to back up or migrate than bind mounts.
• You can manage volumes using Docker CLI commands or the Docker API.
• Volumes work on both Linux and Windows containers.
• Volumes can be more safely shared among multiple containers.
• Volume drivers allow you to store volumes on remote hosts or cloud providers, to encrypt the contents of volumes, or to add other functionality.
• A new volume’s contents can be pre-populated by a container.

EDIT (9.9.2019):
According to @Sebi2020 comment, Bind mounts are much easier to backup. Docker doesn't provide any command to backup volumes. You have to use temporary containers with a bind mount to create backups.

Volumes

Created and managed by Docker. You can create a volume explicitly using the docker volume create command, or Docker can create a volume during container or service creation.

When you create a volume, it is stored within a directory on the Docker host. When you mount the volume into a container, this directory is what is mounted into the container. This is similar to the way that bind mounts work, except that volumes are managed by Docker and are isolated from the core functionality of the host machine.

A given volume can be mounted into multiple containers simultaneously. When no running container is using a volume, the volume is still available to Docker and is not removed automatically. You can remove unused volumes using docker volume prune.

When you mount a volume, it may be named or anonymous. Anonymous volumes are not given an explicit name when they are first mounted into a container, so Docker gives them a random name that is guaranteed to be unique within a given Docker host. Besides the name, named and anonymous volumes behave in the same ways.

Volumes also support the use of volume drivers, which allow you to store your data on remote hosts or cloud providers, among other possibilities.

Bind mounts

Available since the early days of Docker. Bind mounts have limited functionality compared to volumes. When you use a bind mount, a file or directory on the host machine is mounted into a container. The file or directory is referenced by its full path on the host machine. The file or directory does not need to exist on the Docker host already. It is created on demand if it does not yet exist. Bind mounts are very performant, but they rely on the host machine’s filesystem having a specific directory structure available. If you are developing new Docker applications, consider using named volumes instead. You can’t use Docker CLI commands to directly manage bind mounts.

There is also tmpfs mounts.
tmpfs mounts

A tmpfs mount is not persisted on disk, either on the Docker host or within a container. It can be used by a container during the lifetime of the container, to store non-persistent state or sensitive information. For instance, internally, swarm services use tmpfs mounts to mount secrets into a service’s containers.

Reference:
https://docs.docker.com/storage/

Answer 2

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?

It is because, as mentioned in "Mount a host directory as a data volume"

The host directory is, by its nature, host-dependent. For this reason, you can’t mount a host directory from Dockerfile because built images should be portable. A host directory wouldn’t be available on all potential hosts.

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.

You can combine both approaches:

 docker run --volumes-from dbdata -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata 

Here we’ve launched a new container and mounted the volume from the dbdata container.
We’ve then mounted a local host directory as /backup.
Finally, we’ve passed a command that uses tar to backup the contents of the dbdata volume to a backup.tar file inside our /backup directory. When the command completes and the container stops we’ll be left with a backup of our dbdata volume.