Identical Docker images with different containers and ports not accessible - node.js

Question

I'm running Docker host on my Windows dev machine and have 2 identifcal images exposing different ports (3000, 3001). Using the following docker-compose I build and run the containers but the container on port 3001 isn't available via localhost or my IP address.
DockerFile
FROM mhart/alpine-node:8
# Create an app directory (in the Docker container)
RUN mkdir -p /testdirectory
WORKDIR /testdirectory
COPY package.json /testdirectory
RUN npm install --loglevel=warn
COPY . /testdirectory
EXPOSE 3000
CMD ["node", "index.js"]
DockerFile
FROM mhart/alpine-node:8
# Create an app directory (in the Docker container)
RUN mkdir -p /test2directory
WORKDIR /test2directory
COPY package.json /test2directory
RUN npm install --loglevel=warn
COPY . /test2directory
EXPOSE 3001
CMD ["node", "index.js"]
Docker-Compose file
version: '3'
services:
testdirectory:
container_name: testdirectory
environment:
- DEBUG=1
- NODE_ENV=production
- NODE_NAME=testdirectory
- NODE_HOST=localhost
- NODE_PORT=3000
- DB_HOST=mongodb://mongo:27017/testdirectory
- DB_PORT=27017
build:
context: ./test-directory
volumes:
- .:/usr/app/
- /usr/app/node_modules
ports:
- "3000:3000"
depends_on:
- mongodb
command: npm start
test2directory:
container_name: test2directory
environment:
- DEBUG=1
- NODE_ENV=production
- NODE_NAME=test2directory
- NODE_HOST=localhost
- NODE_PORT=3001
- DB_HOST=mongodb://mongo:27017/test2directory
- DB_PORT=27017
build:
context: ./test2-directory
volumes:
- .:/usr/app/
- /usr/app/node_modules
ports:
- "3001:3001"
depends_on:
- mongodb
command: npm start
mongodb:
image: mongo:3.4.4
container_name: mongo
ports:
- 27017:27017
volumes:
- /data/db:/data/db
Is there any obvious I'm missing as when I run
docker container port test2directory
it returns
3001/tcp -> 0.0.0.0:3001

Answer 1

Found the problem! Setting the HOST to localhost in the container caused the problem and changing it to 0.0.0.0 got it working.