使用 docker-compose 时无法从本地主机访问 docker 容器端口

Question

I have a very basic node/express app with a dockerfile and a docker-compose file. When I run the docker container using

docker run -p 3000:3000 service:0.0.1 npm run dev

I can go to localhost:3000 and see my service. However, when I do:

docker-compose run server npm run dev

I can't see anything on localhost:3000, below are my files:

Dockerfile

WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
EXPOSE 3000

docker-compose.yml

version: "3.7"
services:
    server:
        build: .
        ports:
            - "3000:3000"
        image: service:0.0.1
        environment:
            - LOGLEVEL=debug
        depends_on:
            - db
    db:
        container_name: "website_service__db"
        image: postgres
        environment:
            - POSTGRES_USER=user
            - POSTGRES_PASSWORD=pass
            - POSTGRES_DB=website_service

also, everything is working fine from the terminal/docker side - no errors and services are running fine, i just cant access the node endpoints

Answer 1

tl;dr

docker-compose run --service-ports server npm run dev
// the part that changed is the new '--service-ports' argument

the issue was a missing docker-compose run argument --service-ports :

from these docs :

The second difference is that the docker-compose run command does not create any of the ports specified in the service configuration . This prevents port collisions with already-open ports. If you do want the service's ports to be created and mapped to the host , specify the --service-ports flag: