How docker sets port mapping for running containers

Method 1:

1. Obtain the container IP

Replace container_name with the container name in the actual environment

docker inspect `container_name` | grep IPAddress

2 , iptable forward port

Map the 8000 port of the container to the 8001 port of the docker host

iptables -t nat -A  DOCKER -p tcp --dport 8001 -j DNAT --to-destination 172.17.0.19:8000

Method 2:

1. Submit a running container as a mirror

docker commit containerid foo/live

2. Run the image and add the port

docker run -d -p 8000:80 foo/live /bin/bash

Recommended tutorial: docker tutorial

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