What is the mapping of docker

In docker, mapping refers to the process in the container that is used to interact with the outside. Commonly used is the mapping between the port in the container and the host. Through port mapping, the host can be accessed from the outside. Specify the port to access the container application.

The operating environment of this tutorial: linux7.3 system, docker-1.13.1 version, Dell G3 computer.

What is docker mapping

1. What is Docker mapping?

The application is running in the container, and external access and interaction are required, which involves the mapping between the port in the container and the host;

Through With port mapping, we can access the specified port of the host from the outside to access the container application;

2, how to implement Docker mapping?

Here we take Tomcat as an example to see how to access Tomca in the host host externally through Docker port mapping.

2.1, download tomcat container image

Download image: docker pull tomcat:tag, if you don’t add a version number, the latest version will be downloaded by default

View all images: docker images, I have downloaded three versions of tomcat here

2.2, create and start tomcat Container

Create and start the tomcat container: docker run --name tomcat1 -d tomcat :latest, where -d means running the container in the background, tomcat1 is the container name, and tomcat :latest indicates the version number

View running containers: docker ps

2.3, open port mapping command

Mapping command: docker run --name container name -d -p (server port): (Docker port) image-name

--name: Custom container name, when not specified, Docker will automatically generate a name

-d: indicating the background running container

Server port: the tomcat port here is 8080

Docker port: We can set a port number arbitrarily, But the premise is that this port number cannot be occupied

image-name: Specify the running image name and Tag. You can also use the image ID here

At this time our port is set up. We enter the server IP address in the browser (view command: ip addr show) plus the Docker port to access it.

Recommended learning: "docker video tutorial"

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