MongoDB on with Docker "failed to connect to server [localhost:27017] on first connect "

Question

I am using mongoDB with and NodeJS backend. The Problem is I am getting the following error

node:16) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]

This is my docker-compose

version: '3.4'

services:
  db:
    image: mongo:latest
    ports:
      - '27017:27017'

  rest-api-node:
    build: .
    ports:
      - '5000:5000'
    links:
      - db
    restart: on-failure

I have tried with depends_on as well , was not working.

On backend I am mongoose as a middleware to communicate with DB. this is the part of my index.js

mongoose.Promise = global.Promise
mongoose.connect('mongodb://localhost/demo')
app.listen(port, () => console.log("live"))

I have tried using promise as well , no change though. Please Help me out. Thanks in advance

complete error log

at Pool. (/app/node_modules/mongodb-core/lib/topologies/server.js:505:11) rest-api-node_1 | at Pool.emit (events.js:180:13) rest-api-node_1 | at Connection. (/app/node_modules/mongodb-core/lib/connection/pool.js:329:12) rest-api-node_1 | at Object.onceWrapper (events.js:272:13) rest-api-node_1 | at Connection.emit (events.js:180:13) rest-api-node_1 | at Socket. (/app/node_modules/mongodb-core/lib/connection/connection.js:245:50) rest-api-node_1 | at Object.onceWrapper (events.js:272:13) rest-api-node_1 | at Socket.emit (events.js:180:13) rest-api-node_1 | at emitErrorNT (internal/streams/destroy.js:64:8) rest-api-node_1 | at process._tickCallback (internal/process/next_tick.js:178:19) rest-api-node_1 | name: 'MongoNetworkError', rest-api-node_1 |
message: 'failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]' }

Solution 1

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name.

According to your docker-compose.yaml file you can access you mongo container on 127.0.0.1:27017 only from host machine. In order to access it from NodeJS backend container you should use db:27017.

Solution 2

I have the same problem, other solutions not work for me but I did that this way

Note :

for mongo URI you must use your MongoDB service name instead 127.0.0.1 or localhost

for example, in below docker-compose file my mongo service name is mongodb-myapp and I change URI like this mongodb://mongodb-myapp:27017/myapp and it works for me

services:
  boilerplate-api-app:
    build: .
    environment:
      - MONGO_URI=mongodb://mongodb-myapp:27017/myapp
    volumes:
      - .:/app
    ports:
      - "5000:5000"
    depends_on:
      - mongodb-myapp

 mongodb-myapp:
    image: mongo
    ports:
      - "27017:27017"

Solution 3

I was also stuck on this for hours! Setting db:27017 in the connection string and restart: always on the rest-api-node makes sure that you connect to the correct IP and makes sure that the node server keeps on trying to connect to your db. This worked for me!

Comments

[Jim Kim]

What do you mean by db:27017?

[Rajesh Barik]

I believe it's the mongo url. I was facing the same issue. Inside the container there is no localhost. You have to change the url to mongodb://db:27017/demo. That solved my problem.

[ChumiestBucket]

ERROR: The Compose file './docker-compose.yml' is invalid because: services.mongo.ports is invalid: Invalid port "db:27017", should be [[remote_ip:]remote_port[-remote_port]:]port[/protocol] -- the above suggestion causes this error. i also tried the name of the DB i'm using.

[nickgryg]

@ChumiestBucket I don't understand why you voted -1 to the answer? You don't need to change above docker-compose.yml. When you changed it you got the error. My post is about application setting where we define url to a mongodb container. It should be 'db:27017' instead of 'localhost:27017'.

[ChumiestBucket]

@nickgryg my bad, i misunderstood this

[Mo1]

This mongodb://db:27017/demo worked for me. Thx nickgryg

[Admin]

How would this work if your docker-compose has a user and password?

[SeekanDestroy]

Rajesh Barik you just save my life