Meanings Of Docker Volume Create

1. Docker volume create volume_name will create a _data folder for data persisting.

$ docker volume create db_data 
db_data
$ docker volume inspect db_data
[
    {
        "CreatedAt": "2020-09-09T04:13:10Z",
        "Driver": "local",
        "Labels": {},
        "Mountpoint": "/var/lib/docker/volumes/db_data/_data",
        "Name": "db_data",
        "Options": {},
        "Scope": "local"
    }
]

2. Using Docker volume created for persisting data. Before using -v volume_name_host:/volume_name_container,  --rm the running container.

$ docker rm -f <container_id>

$ docker run -v db_data:/etc/db_data -dp 3000:3000 lqwangxg/docker-node