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It is believed that many inexperienced people don't know what to do about how to map the port of docker container. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Docker port mapping is to map the service ports applied in the container to the host machine. When some network applications are running in the container, the port mapping can be specified by-P or-p parameters to allow external access to these applications.

1. Random mapping. When using the-P parameter, the docker container will randomly map a port to a network port open by the internal container.

two。 Specify the port, and when using the-p parameter, you can specify the port to be mapped, and only one container can be bound on a specified port.

3. Look at the mapped port, use the docker port command to see the currently mapped port configuration, and you can also see the bound address.

Method one

1. Get the container IP

Change the container_name to the container name in the real environment

Docker inspect `container_ name` | grep IPAddress

2. Iptable forwarding port

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

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

Method two

1. Submit a running container as an image

Docker commit containerid foo/live

two。 Run the mirror and add a port

Docker run-d-p 8000UR 80 foo/live / bin/bash

After reading the above, have you mastered how docker containers map ports? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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