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I'm using Docker for Mac. I have a container that run a server, for example my server is run on port 5000. I have exposed this port on Dockerfile
When my container is running, I connect to this container and check and if this server is working or not by running below command and see that it returns data (a bunch of html and javascript)
wget -d localhost:5000
Notes, I start this container and also publish port outside by command:
docker run -d -p 5000:5000 <docker_image_name>
But at docker host (is my mac and running El Capitan), I open chrome and go to address localhost:5000. It doesn't work. Just a little note, if I go to any arbitrary port such as localhost:4000 I see error message from chrome such as:
This site can’t be reached
localhost refused to connect.
But error message for localhost:5000 is:
The localhost page isn’t working
localhost didn’t send any data.
So it seems I have configured work "a little" but something wrong. Please tell me how to fix this.
241
Use --net="host" in your docker run command, then localhost in your docker container will point to your docker host. THIS! This is the answer!
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.
There are several ways to do this: you can expose a port via the --expose flag at runtime, or include an EXPOSE instruction in the Dockerfile. You can also publish ports by using the -p or -P flags in the Docker run string. There's also container linking via --link .
Please check the program in container is listening on interface 0.0.0.0.
In container, run command:
ss -lntp
If it appears like:
LISTEN 0 128 127.0.0.1:5000 *:*
that means your web app only listen at localhost so container host cannot access to your web app. You should make your server listen at 0.0.0.0 interface by changing your web app build setting.
For example if your server is nodejs app:
var app = connect().use(connect.static('public')).listen(5000, "0.0.0.0");
If your server is web pack:
"scripts": {
"dev": "webpack-dev-server --host 0.0.0.0 --port 5000 --progress"
}
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