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Publishing Ports

Publishing ports happens during container creation using the -p (or --publish) flag with docker run. The syntax is:

docker run -d -p HOST_PORT:CONTAINER_PORT nginx

  • HOST_PORT: The port number on your host machine where you want to receive traffic

  • CONTAINER_PORT: The port number within the container that's listening for connections

For example, to publish the container's port 80 to host port 8080:

docker run -d -p 8080:80 nginx

Now, any traffic sent to port 8080 on your host machine will be forwarded to port 80 within the container.

The first 8080 refers to the host port. This is the port on your local machine that will be used to access the application running inside the container. The second 80 refers to the container port. This is the port that the application inside the container listens on for incoming connections. Hence, the command binds to port 8080 of the host to port 80 on the container system.

Start a container using the httpd image with the following command:

docker run -d -p 8080:80 --name my_site httpd:2.4
  • -d, --detach: Run container in background and print container ID
  • -p, --publish list: Publish a container's port(s) to the host

Open the browser and access http://localhost:8080 or use the curl command to verify if it's working fine or not.

curl localhost:8080