Unable to use localhost with Docker Container

Question

I have tried other answers on stackoverflow and github, but none of them are working. When I run the container I get this as the output(Which is the standard "flask run" output)

This is my Dockerfile

FROM alpine:latest

RUN apk add --no-cache python3-dev && pip3 install --upgrade pip 

WORKDIR /app

COPY . /app

RUN pip3 install Flask && pip3 install requests && pip3 install simplejson

EXPOSE 5000
CMD [ "flask", "run" ]

I have tried 0.0.0.0:5000 too but its not working.

Answer 1

Run this command to know the IP address of the host. boot2docker ip

Now use this IPAddress along with the port number mapped to your host.

When you spawn a container that is running a process such as a web server, you need to specify what ports to publish from the container to the host, for example

docker run -p 8888:8080 tomcat

this publishes port 8080 from the container to the host's port 8888

Answer 2

1. 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).

2. You can expose a port through your Dockerfile or use --expose and then publish it with the -p 80:80 flag. This will bind the exposed port to your Docker host on port 80, and it expects the exposed port is 80 too (adjust as necessary with HOST:CONTAINER).

3. You can ignore exposing anything and just use -p 80:80 in which case this doubles as both exposing AND publishing the port.

Try running,

docker run -d --name <your_ctr_name>-p 5000:5000 <your_image_name>:latest

If you need to bind host,

docker run -d --name container_name -p 10.x.x.100:5000:5000 image_name:latest

If you want to expose the docker using network host,

docker run -d  --network host --name container_name image_name:latest