How docker pulls images and generates containers

Docker is an open source application container engine that allows developers to package their applications and dependencies into a portable container, and then Publish to any popular Linux machine and can also be virtualized. This article describes how docker pulls images and generates containers. Interested friends can learn more.

1. Get the image from Docker Registry
   Parameters: docker pull [option] [Docker Registry address] :
   If you do not write the Registry address, then By default, it is pulled from the official warehouse
   For example, using the domestic image: docker pull registry.docker-cn.com/library/centos:6
   
2. Viewed Some image files

docker images

3. docker generates containers Related tutorials:docker video tutorial
   You can generate a container by executing an Nginx image
   Parameters: docker run --name [container name] [options] -p : [warehouse name]
   -d means running in the background -p means setting port

如上图中的，docker run --name webserver -d -p 80:80 nginx

4. Check whether the container is started. If you want to check all, you can add -a

docker ps

after the command.
5. Verify the nginx service, open the browser, enter localhost, you can see the default homepage of nginx, as shown in the figure.
   
   Of course, we can also enter the container and modify some content.
6. Enter the container
   Parameters: docker exec -it [containerName] bash
   For example, execute docker exec -it webserver bash
   
7. You can change the default display homepage of nginx by modifying echo '<h1>hello docker</h1>' > /usr/share/nginx/html/index.html.

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