Docker Volume

The runtime environment of the container provider should be decoupled from the data generated by the program and the configurations the program depends on. A volume is a virtual directory that acts as a bridge between the container's internal directory and the host's directory.

Data Mount Directory

/var/lib/docker/volumes/
docker run -d --name nginx -p 80:80 -v html:/usr/share/nginx/html nginx
-v html:/usr/share/nginx/html mounts the host's html directory to the container's /usr/share/nginx/html directory.

Mount Local Directory

docker run -d --name nginx -p 80:80 -v /Users/crc/Documents/IT-Study/Project/my-docs/src/posts/docker/html:/usr/share/nginx/html nginx

Mount local directory

-v local_directory:container_directory

Mount local file

-v local_file:container_file Note: The local directory or file must start with / or ./; if it starts directly with a name, it will be recognized as a volume name rather than a local directory name.

Command

Description	Command
Create a volume	docker volume create
List all volumes	docker volume ls
Remove a specific volume	docker volume rm
Inspect a specific volume	docker volume inspect
Remove all unused volumes	docker volume prune

Notice!

The mounting of containers and data volumes must be configured when creating the container. For already created containers, data volumes cannot be set. Additionally, during the container creation process, data volumes are automatically created and do not need to be manually created.