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I am very new to Docker and I'm struggling with a configuration. My current configuration is that I have multiple Node/Express microservices on my local system which are using nodemon. All of these connect to mongodb running on mongodb://localhost:27017/localv2.

I'm trying to dockerize all my microservices. The issue is that they are not able to connect to mongodb on localhost:27017. I have 2 questions:

  1. Why are they not able to connect to localhost:27017?

  2. How to make them connect to the current running mongodb in my system?

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3 Answers 3

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1 & 2. When you build a docker container, it creates VLAN for docker container with ip address gateway is : 172.17.42.1, so docker container would connect to mongo, it should be : mongodb://172.17.42.1:27017/localv2

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Cool. I get this point. But I'm running multiple microservices. If there is a docker container for each of them, there there will be a different mogodb URL for each of them. I want a single database. Can you please point me to the right direction of how to achieve this?
Using only 1 URL above for multiple docker containers. Because 172.17.42.1 is gateway ip address for all docker containers.
I got this to work by using a combination of your and Guillaume Simonneau's answer below. One more issue though: What to do if my mongodb is running remotely, like on modulus? My mongo connection string is something like: mongodb://uname:[email protected]:27017/db123. When I run my container, it gives error: MongoError: failed to connect to server [jello.modulusmongo.net:27017] on first connect.
[jello.modulusmongo.net:27017] means port 27017 hasn't opened on modulus, check it.
It is open. The same thing works when I run my app using normal node command. It is not working from inside docker container.
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You can try something like this:

```

version: '2'
services:

  mongod:
    image: khezen/mongo:3.4
    volumes:
      - /data/mongo/mongod1:/data/db
    ports:
      - "27017:27017"
    network_mode: bridge
    restart: unless-stopped

  helloworld:
    build: ./
    links: 
      - mongod:database
    ports:
      - "80:80"
    network_mode: bridge
    restart: unless-stopped

```

helloworld will resolve datatabase as the ip address of mongod

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first, -you need to find docker container ip addres by, docker inspect container_id -the field is like "IPAddress": "172.17.0.7"

second, -you neeed to start mongod on your local machine -you need to use mongochef(mongo browser) -from mongo browser you need to connect mongo client as localhost:27017 instead of this use container-ip:27017 and connect to mongodb instance

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