Docker data volume container creation and usage analysis

A data volume container is a container specifically used to mount data volumes. This container is mainly referenced and used by other containers. The so-called data volume container is actually an ordinary container, as shown below:

Create a data volume container

Create a data volume container using the following method:

docker run -itd -v /usr/share/nginx/html/ --name mydata ubuntu

The command execution effect is as follows:

Reference Container

Use the following command to reference the data volume container:

docker run -itd --volumes-from mydata -p 80:80 --name nginx1 nginx
docker run -itd --volumes-from mydata -p 81:80 --name nginx2 nginx

At this point, nginx1 and nginx2 both mount the same data volume to the /usr/share/nginx/html/ directory. If any of the three containers is modified,

The files in this directory can be seen in the other two.

At this point, use the docker inspect command to view the details of the container and find that the descriptions of the data volumes of the three containers are consistent, as shown below:

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