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Simple and easy way to reconfigure your existing docker container's port mapping.
I am CS Student currently perusing my bachelor degree. I love coding and implementing new logics. Aside from that I'm also a hardware lover and has great interest in IOT.
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You forgot to expose a port in container? Don't worry, I have a solution to your problem.
Just follow these steps.
Step 1 : Stop the container you want to modify.
sudo docker stop [containerId]
Step 2: Stop your docker service
To stop the docker.service, first we have to stop docker.socket. Otherwise, it will retrigger to start the docker.service again. So first stop the docker.socket with :
sudo systemctl stop docker.socket
and then docker.service with
sudo systemctl stop docker.service
You can verify whether the service has been stopped or not by using following command.
sudo systemctl status docker
It should output something like this
Now we are good to proceed.
Step 3 : Update the container's config.v2.json
This file will be located under
/var/lib/docker/containers/[containerId]/config.v2.json
// or if docker is installed as snap
/var/snap/docker/common/var-lib-docker/containers/[containerId]
/config.v2.json
For this example, lets say we want to expose the port 8000.
(a) Update entry for “ExposedPorts”
(b) Update entry for “Ports”
So update the file as
...
{
"Config": {
....
"ExposedPorts": {
"80/tcp": {},
"8000/tcp": {} //New port number to be exposed
},
....
},
"NetworkSettings": {
....
"Ports": {
"80/tcp": [
{
"HostIp": "",
"HostPort": "80"
}
],
//-------- Start ---------
"8000/tcp": [ //New added port's mapping
{
"HostIp": "", // IP address of the container
"HostPort": "8000" //Container's internal port that needs to be exposed.
}
]
//-------- End ---------
},
....
}
ctrl+x
y
Enter
To save and exit
Step 4 : Update the container's hostconfig.json
This file will be located under
/var/lib/docker/containers/[containerId]/hostconfig.json
// or if docker is installed as snap
/var/snap/docker/common/var-lib-docker/containers/[containerId]
/hostconfig.json
....
"PortBindings": {
"80/tcp": [
{
"HostIp": "",
"HostPort": "80"
}
],
"8000/tcp": [ //new added port
{
"HostIp": "", // IP address of the host container.
"HostPort": "8000" //Container's internal port that needs to be exposed.
}
]
},
.....
ctrl+x
y
Enter
To save and exit
Thats it, your port mapping has been updated.
Now start the container service again with
sudo systemctl start docker
Then start the modified container
sudo docker start [containerId]
Note: The port mapping in docker ps will not be modified unless the container is restarted.
Once the modified container has been started, check status with
docker ps
and you will see the modified port changes.
Hope this helps you. And Happy Coding !