Docker container technology-container storage

table of Contents

Container storage

Data volume management

Core options:

• -v host directory: specify the directory mounted to the container.

To map multiple host directories, just write a few more -v.

Create volume when mounting

• Mount the volume:

docker run -d -p 80:80 -v /data:/usr/share/nginx/html nginx:latest

• Set up a shared volume and start a new container with the same volume:

docker run -d -p 8080:80 -v /data:/usr/share/nginx/html nginx:latest 

Mount after creating the volume

• View the list of volumes:

docker volume ls

• View data disks not used by the container

docker volume ls -f dangling=true

• Create a volume:

$ docker volume create 
f3b95f7bd17da220e63d4e70850b8d7fb3e20f8ad02043423a39fdd072b83521

$ docker volume ls 
DRIVER              VOLUME NAME
local               f3b95f7bd17da220e63d4e70850b8d7fb3e20f8ad02043423a39fdd072b83521

• View volume path:

$ docker volume inspect <volume_name> 
[
    {
        "CreatedAt": "2018-02-01T00:39:25+08:00",
        "Driver": "local",
        "Labels": {},
        "Mountpoint": "/var/lib/docker/volumes/clsn/_data",
        "Name": "clsn",
        "Options": {},
        "Scope": "local"
    }
]

• Use the volume to create a container:

docker run -d -p 9000:80 -v <volume_name>:/usr/share/nginx/html nginx:latest 

• Delete volume

docker rm -v <volume_name>

Data container management

A special container can be created to act as a data container, that is, when the container is created, the data disk of this container is specified, and then other containers can use this data container as their data disk.

• Create a data container:

docker create -v /mnt -it --name newnginx docker.io/nginx /bin/bash

• Use this data container to run a container

docker run --volumes-from newnginx --name nginx1 -it docker.io/nginx /bin/bash