Contents
Roadmap info from roadmap website
Volume Mounts
Volume mounts are a way to map a folder or file on the host system to a folder or file inside a container. This allows the data to persist outside the container even when the container is removed. Additionally, multiple containers can share the same volume, making data sharing between containers easy.
Creating a Volume
To create a volume in Docker, you need to run the following command:
docker volume create my-volume
This command will create a volume named my-volume. You can inspect the details of the created volume using the command:
docker volume inspect my-volume
Mounting a Volume in a Container
To mount a volume to a container, you need to use the -v or --mount flag while running the container. Here’s an example:
Using -v flag:
docker run -d -v my-volume:/data your-image
Using --mount flag:
docker run -d --mount source=my-volume,destination=/data your-image
In both examples above, my-volume is the name of the volume we created earlier, and /data is the path inside the container where the volume will be mounted.
For an in-depth exploration of the
-vand--mountflags, consult Docker’s official guide on Choose the -v or —mount flag.
Sharing Volumes Between Containers
To share a volume between multiple containers, simply mount the same volume on multiple containers. Here’s how to share my-volume between two containers running different images:
docker run -d -v my-volume:/data1 image1
docker run -d -v my-volume:/data2 image2
In this example, image1 and image2 would have access to the same data stored in my-volume.
Removing a Volume
To remove a volume, you can use the docker volume rm command followed by the volume name:
docker volume rm my-volume
That’s it! Now you have a basic understanding of volume mounts in Docker. You can use them to persist and share data between your containers efficiently and securely.