How to share a volume between multiple Docker containers?

To share a volume between multiple Docker containers there are two steps to follow:

1. Create a volume.

You can create a volume using the `docker volume create` command.

```
docker volume create myvol
```

1. Use the volume in your containers.

You can use the -v or —volume option in your `docker run` commands to mount a volume to your containers.

As an example to share a volume between two Ubuntu containers, your commands would look like this:

```

create and start the first container
docker run -d —name mycontainer1 -v myvol:/data ubuntu

start the second container with the same volume
docker run -d —name mycontainer2 -v myvol:/data ubuntu
```

This will create two different Ubuntu containers (`mycontainer1` and `mycontainer2`) that share the same volume (`myvol`), mounted at the `/data` directory.

It is important to note that changes made in the directory `/data` inside one container are also visible in the directory `/data` inside the other container, since they share the same volume.