(Docker notes): named mount and anonymous mount

table of Contents

Named and anonymous mount

Anonymous mount

docker volume command

Named mount

---

Named and anonymous mount

Anonymous mount

• Only specify the inside of the container, not specify the outside of the container

docker run -d -P --name nginx01 -v /etc/nginx nginx

-v path in the container	Do not write the path on the host, it will automatically create a path
-P	Capital P, specify the port randomly

docker volume command

• It can be found that the name of the volume is a string of characters, which is an anonymous mount
• In -v, only the path inside the container is written, and the path outside the container is not written

Named mount

• Name the volume by -v volume name: path in the container

docker run -d -P --name nginx02 -v juming-nginx:/etc/nginx nginx

• View the specific location of the volume name

docker volume inspect juming-nginx

• All the volumes in the docker container are in : /var/lib/docker/volumes/xxxx/_data without specifying a directory

• We can easily find one of our volumes through named mounting . In most cases, we are also using named mounting

• So the question is, how do we determine whether it is a named mount, an anonymous mount, or a specified path mount?

-v path in the container	Anonymous mount
-v volume name: path in the container	Named mount
-v /host path: path in the container	Specify the path to mount, pay attention to /

• note
  • Sometimes we will encounter such a command, the path is followed by a ro or rw

docker run -d -P --name nginx02 -v juming-nginx:/etc/nginx:ro nginx
docker run -d -P --name nginx02 -v juming-nginx:/etc/nginx:rw nginx

• Once the permissions of the container are set, the container will limit the content we mount
• ro As long as you see ro, it means that this path can only be operated by the host, and the inside of the container cannot be operated. The default is rw