docker-persistence-volume-mounts

tags:

  • roadmap
  • docker
  • docker-persistence
  • ready
  • online
  • data-persistence
  • volume

docker-persistence-volume-mounts

Contents

__Roadmap info from [ roadmap website ] (https://roadmap.sh/docker/data-persistence/volume-mounts) __

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 -v and --mount flags, 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.