KeystoneJS docker-compose can't connect mongo db - mongodb

Question

I am trying to deploy keystoneJS app on the server. Before that I want to test it locally.
I started mongoDB locally. Then use the Dockerfile from the documentation https://www.keystonejs.com/guides/deployment here, I can't run it. I get the error below:
✖ Connecting to database
Error: Server selection timed out after 30000 ms
at /home/node/node_modules/#keystonejs/utils/dist/utils.cjs.prod.js:54:26
at async executeDefaultServer (/home/node/node_modules/#keystonejs/keystone/bin/utils.js:109:3) {
errors: {
MongooseAdapter: MongoTimeoutError: Server selection timed out after 30000 ms
at Timeout._onTimeout (/home/node/node_modules/mongodb/lib/core/sdam/server_selection.js:308:9)
at listOnTimeout (internal/timers.js:531:17)
at processTimers (internal/timers.js:475:7) {
name: 'MongoTimeoutError',
reason: [MongoNetworkError],
[Symbol(mongoErrorContextSymbol)]: {}
}
}
}
error Command failed with exit code 1.
I googled seems didn't know about local mongodb://localhost:27017.
Then I decided to use docker-compose:
Here is the docker-compose.yml
version: '3'
services:
app:
container_name: my-admin
restart: always
build: .
volumes:
- .:/mycode
environment:
- MONGO_URI=mongodb://mongo:27017
ports:
- "80:3030"
links:
- mongo
mongo:
image: mongo:latest
restart: always
ports:
- "27017:27017"
when I run docker-compose up, got the same error.
Also tried this:
const keystone = new Keystone({
name: PROJECT_NAME,
adapter: new Adapter({mongoUri: "mongodb://mongo:27017/myapp"}),
onConnect: initialiseData,
});
Any help? Thanks!
EDIT
Here is the Dockerfile
# https://docs.docker.com/samples/library/node/
ARG NODE_VERSION=12.10.0
# https://github.com/Yelp/dumb-init/releases
ARG DUMB_INIT_VERSION=1.2.2
# Build container
FROM node:${NODE_VERSION}-alpine AS build
ARG DUMB_INIT_VERSION
WORKDIR /home/node
RUN apk add --no-cache build-base python2 yarn && \
wget -O dumb-init -q https://github.com/Yelp/dumb-init/releases/download/v${DUMB_INIT_VERSION}/dumb-init_${DUMB_INIT_VERSION}_amd64 && \
chmod +x dumb-init
ADD . /home/node
RUN yarn install && yarn build && yarn cache clean
# Runtime container
FROM node:${NODE_VERSION}-alpine
WORKDIR /home/node
COPY --from=build /home/node /home/node
EXPOSE 3000
CMD ["./dumb-init", "yarn", "start"]