Unable to connect localhost in docker

Question

I run the images in docker terminal:

docker run -p 4000:80 friendlyhello

Localhost does not connect and display images.

This site can’t be reached
localhost refused to connect.
- Did you mean http://localhost4000.org/?
- Search Google for localhost 4000
ERR_CONNECTION_REFUSED

Answer 1

i think maybe you visit http://localhost:4000 in browser on Windows,then you should use the docker default machine ip(generally 192.168.99.100). just try http://192.168.99.100:4000.

Answer 2

I had this problem too, solved following this part of the documentation:

Note: If you are using Docker Toolbox on Windows 7, use the Docker Machine IP instead of localhost. For example, http://192.168.99.100:4000/. To find the IP address, use the command docker-machine ip.

Answer 3

If you running a nodejs app in the docker container, try '0.0.0.0' instead of 'localhost'.

example: suppose your app works on port 3000

server.listen(3000, 'localhost' () => {

console.log('listening for requests on port 3000');

});


server.listen(3000, '0.0.0.0' () => {
    
console.log('listening for requests on port 3000');
    
});

then you can do port-mapping in docker to your web app.

docker run -p 4000:3000 --name 'your_container_name' 'your_image_name'

start the container and see the port using the below command on your cmd or terminal.

docker port <your_container_name>