Menu
Normally when binding port, I would do docker run -p hostport:dockerport ..., but can I specify the port binding inside my Dockerfile ?
I'm starting a server that listens on a port. The server takes the port through cmd line arguments. It would be great if I don't have to repeat the port in two places (in docker run command and in Dockerfile)
803
You can expose a port through your Dockerfile or use --expose and then publish it with the -P flag. This will bind the exposed port to your Docker host on a random port (verified by running docker container ls ). You can expose a port through your Dockerfile or use --expose and then publish it with the -p 80:80 flag.
Use --network="host" in your docker run command, then 127.0. 0.1 in your docker container will point to your docker host. Note: This mode only works on Docker for Linux, per the documentation.
In dockerfile you can only use expose. The EXPOSE instruction informs Docker that the container listens on the specified network ports at runtime. EXPOSE does not make the ports of the container accessible to the host.
To allocate Hostport to container you need to do publish (-p). Or the -P flag to publish all of the exposed ports.
To automate the process, You can use docker-compose. In docker compose file you can orchestrate multiple docker run commands with different arguments.
184
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
