How can I connect docker container use localhost?

Question

I created a docker-container based on nodejs. However, it seems to run fine, but both localhost:8080 and localhost:8443 and localhost can't connect. Also, the connection using curl produces the following message:

$ curl -vvv localhost:8080
*   Trying ::1:8080...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET / HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.67.0
> Accept: */*
> 
* Recv failure: Connection reset by peer
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer
$ curl -vvv localhost:8443
*   Trying ::1:8443...
* TCP_NODELAY set
* Connected to localhost (::1) port 8443 (#0)
> GET / HTTP/1.1
> Host: localhost:8443
> User-Agent: curl/7.67.0
> Accept: */*
> 
* Recv failure: Connection reset by peer
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer

This is docker-compose.yml

version: "2"
services:
  app:
    container_name: app_test
    restart: always
    build: .
    ports:
      - "8080:8080"
      - "8443:8443"

This is Dockerfile

FROM node:10.12.0

WORKDIR /usr/src/app

COPY package.json ./

RUN npm install

COPY . .

EXPOSE 80 # I try 3000, 8080 instead 80

CMD [ "node", "app.js" ]

And This is result of docker ps

docker ps
CONTAINER ID        IMAGE                       COMMAND                  CREATED             STATUS              PORTS                                                    NAMES
735fba0a6ff5        IMAGE_NAME                  "node app.js"            46 seconds ago      Up 45 seconds       0.0.0.0:8080->8080/tcp, 80/tcp, 0.0.0.0:8443->8443/tcp   app_test

Neither curl nor browser runs. What should I do?

(I'm awkward because I'm not good at English. Please understand.)

@QuintenScheppermans This is ./bin/www If you look below it is connected to 3000. var port = normalizePort(process.env.PORT || '3000'); app.set('port', port); — DOYEOP KIM
– DOYEOP KIM, Commented Jan 2, 2020 at 14:10
Have you tried to add from your docker-compose file: ports: - "80:3000" — J.Rojas
– J.Rojas, Commented Jan 2, 2020 at 14:10

Quinten Scheppermans · Accepted Answer · 2020-01-02 14:11:56Z

4

version: "2"
services:
  app:
    container_name: app_test
    restart: always
    build: .
    ports:
      - "8080:3000"
      - "8443:8443"

If you want access your app on localhost:8080, this should work. A node app serves on port 3000 as standard.

So basically:

{port host machine}:{port it actually runs on inside your container}

answered Jan 2, 2020 at 14:11

Quinten Scheppermans

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5 Comments

DOYEOP KIM Over a year ago

I did try that. But result is same. Port part of the docker ps result 0.0.0.0:8443->8443/tcp, 0.0.0.0:8080->3000/tcp

Quinten Scheppermans Over a year ago

What happens if you exec the command from within the container? "docker exec -it app_test bash" will open a shell, curl localhost:3000 there and tell me what happens.

DOYEOP KIM Over a year ago

Oh! restart docker and then process was successfully! Thank you.

Ashwani Over a year ago

@DOYEOPKIM , Please mark the answer as correct if it solved your problem.

Sang Dang Over a year ago

This answer fixed my problem. It should be the correct answer.

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