Modify the method of port mapping for docker containers

Little scum · Posted on 10/12/2018 11:06:10 AM

Everyone knows that docker run can specify port mappings, but once a container is generated, there is no command that can be directly modified. Usually indirectly, save the image and create a new container, specifying the new port map at the time of creation.

Is there a way to modify the existing container without saving the image? Yes. I found the answer on stackoverflow, the original post is as follows

https://stackoverflow.com/questi ... ng-docker-container

I'm mapping the 8080 port of the rap2-delos container to the 80 of the host machinePort above, as shown below:

Right nowI now want to map the 8080 port of the rap2-delos container to the 8080 port of the host machineabove.

The tutorial is as follows

--Stop container

Login is visible.

--Run docker inspect [CONTAINER ID] | grep id command

Login is visible.

--Run the cd /var/lib/docker/containers command to find the directory with the same ID, as shown in the figure below

Login is visible.

Stop docker engine service, systemctl stop docker

Modify the hostconfig.json configuration file

example

vi hostconfig.json
If there was no port mapping before, there should be a paragraph like this:
"PortBindings":{}
Add a mapping that reads:
"PortBindings":{"3306/tcp":[{"HostIp":"","HostPort":"3307"}]}
The first number is the container port, and the last one is the host port.

After modifying and saving the configuration, finally start the docker service

systemctl start docker

Done

Modify the method of port mapping for docker containers

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