Nginx remove exposing port 80/tcp on a docker container, leave only 8080

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I have set a Nginx to listen on a port 8080 in files/etc/nginx/conf.d/default.conf by adding listen 8080; to the only one server block I have.

I run Nginx by docker run with -p 8080:8080

I would like to ask why there is 80/tcp under PORTS of docker ps command as below?

STATUS         NAMES               IMAGE                       PORTS
Up 6 minutes   docker-nginx        docker-nginx:1.17.8         80/tcp, 0.0.0.0:8080->8080/tcp

command docker inspect docker-nginx shows:

 "HostConfig": {
        "PortBindings": {
            "8080/tcp": [
                {
                    "HostIp": "",
                    "HostPort": "8080"
                }
          

"Config": {
        "ExposedPorts": {
            "80/tcp": {},
            "8080/tcp": {}
        },

    "NetworkSettings": {
        (...)
        "Ports": {
            "80/tcp": null,
            "8080/tcp": [
                {
                    "HostIp": "0.0.0.0",
                    "HostPort": "8080"
                }
            ]
        },

My intention is to have Nginx listen only to 8080 and not be accessible under any other port even by other containers belonging to the same network as Nginx. How to make Nginx not exposing the 80/tcp port?

I'm using a build that is FROM an official nginx:1.17.8 image.

docker port nginx
1 Answers

The Dockerfile for the Nginx image should have the expose instruction for port 80. On the Nginx website, you should be able to find the dockerfile for the image you are using, and should have the expose 80 command.

If you do not want the port 80 exposed, even though it will not be used if you are using port 8080, then remove or comment out expose 80 in the Dockerfile and then build the image.

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