How to connect Node.js app to database when they are running in separate Docker containers?

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I have these containers running:

enter image description here

I am able to visit node app at localhost:49160 and database at localhost:7474 as expected.

However, the node app can't seem to actually connect to the database. I get this error when I try:

Error: connect ECONNREFUSED 127.0.0.1:7474
    at Object.exports._errnoException (util.js:1018:11)
    at exports._exceptionWithHostPort (util.js:1041:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1086:14)

This normally means it can't find the database at that host:port.

Again, I am able to visit 127.0.0.1:7474 and clearly see the database is running.

I have also tried to connecting to 0.0.0.0:7474, but that didn't work either.

There are no issues when I run the node app locally + database in docker container, but this problem occurs when I also run the node app in a docker container.

What host and port should be database be available at (what should I connect to?), and what am I probably missing or doing wrong?

Dockerfile for node-app

FROM node:boron

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

# Install app dependencies
COPY package.json /usr/src/app/
RUN yarn

# Bundle app source
COPY . /usr/src/app

EXPOSE 8080
CMD [ "yarn", "start" ]

docker neo4j run cmd

docker run -d -e NEO4J_AUTH=none \
    --publish=7474:7474 --publish=7687:7687 \
    --volume=$HOME/neo4j/data:/data \
    --volume=$HOME/neo4j/logs:/logs \
    --volume=$HOME/neo4j/conf:/conf \
    --volume=$HOME/neo4j/plugins:/plugins \
    neo4j:3.1.4
docker node.js neo4j
1 Answers
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