docker-compose with Node and Mongo doesn't start both

Question

Symptoms:

1. If I run docker-compose run mongo , Mongo starts fine
2. If I run docker-compose run iotmap or docker-compose up only node starts, not the Mongo container plus

2a) docker-compose ps shows nothing and docker ps shows

e968900e41cc        6e70e14f1339        "/bin/sh -c 'npm sta…"   3 minutes ago       Up 2 minutes        3000/tcp            priceless_hawking

2b) I get the following error

(node:25) UnhandledPromiseRejectionWarning: MongoTimeoutError: Server selection timed out after 30000 ms at Timeout._onTimeout (/usr/src/app/node_modules/mongodb/lib/core/sdam/server_selection.js:309:9) at listOnTimeout (internal/timers.js:537:17) at processTimers (internal/timers.js:481:7) (node:25) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode ). (rejection id: 1) (node:25) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. ERROR: Aborting.

docker-compose.yml:

volumes:
  mongodata:
services:
  iotmap:
    container_name: iotmap
    build: .
    restart: always
    ports:
      - "3000:3000"
    links:
      - mongo
    depends_on:
      - mongo
  mongo:
    container_name: mongo
    image: mongo:latest
    restart: always
    ports:
      - "27017:27017"
    volumes:
     - mongodata:/data/db

and Dockerfile:

FROM node:latest
WORKDIR /usr/src/app
COPY package.json /usr/src/app/
RUN npm install --no-optional --no-shrinkwrap --no-package-lock
COPY . /usr/src/app
EXPOSE 3000
RUN npm start

and in app.js:

mongoose.connect( "mongodb://mongo:27017/iotmap", {useUnifiedTopology: true, useNewUrlParser: true, useCreateIndex: true } );

Answer 1

将RUN npm start更改为CMD [ "npm", "start" ]一切都像魅力一样开始！