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(Google Compute VM) How can I get containers in docker-compose to connect – Debian

I am trying to get angular and nginx containers in docker-compose to speak to each other on a google-compute vm instance (Debian OS), without success. Here is my docker-compose.yml:

version: '3'
services:
  angular:
    container_name: angular
    hostname: angular
    build: project-frontend
    ports:
      - "80:80"
        #network_mode: host
  nodejs:
    container_name: nodejs
    hostname: nodejs
    build: project-backend
    ports:
      - "8080:8080"
        # network_mode: host

I have read the docs and numerous SO posts such as this, and understand that angular should be trying to find node at http://nodejs:8080/, but I’m getting:

POST http://nodejs:8080/login/ net::ERR_NAME_NOT_RESOLVED

When I do docker networkk inspect I see this

[
    {
        "Name": "project_default",
        "Id": "2d1665ce09f712457e706b83f4ae1139a846f9ce26163e07ee7e5357d4b28cd3",
        "Created": "2020-05-22T11:25:22.441164515Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.28.0.0/16",
                    "Gateway": "172.28.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "b0fceb913ef14b0b867ae01ce4852ad4a0827c06194102082c0d4b18d7b80464": {
                "Name": "angular",
                "EndpointID": "83fba04c3cf6f7af743cae87116730805d030040f286706029da1c7a687b199c",
                "MacAddress": "02:42:ac:1c:00:03",
                "IPv4Address": "172.28.0.3/16",
                "IPv6Address": ""
            },
            "c181cd4b0e9ccdd793c4e1fc49067ef4880cda91228a10b900899470cdd1a138": {
                "Name": "nodejs",
                "EndpointID": "6da8ad2a83e2809f68c310d8f34e3feb2f4c19b40f701b3b00b8fb9e6f231906",
                "MacAddress": "02:42:ac:1c:00:02",
                "IPv4Address": "172.28.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }

I’m not sure what other steps can help me to debug this.
Thanks.

EDIT:
Thanks to this post I tried to ping nodejs container through the angular container successfully:

$ sudo docker exec -it angular ping nodejs
PING nodejs (172.28.0.2): 56 data bytes
64 bytes from 172.28.0.2: seq=0 ttl=64 time=0.079 ms
64 bytes from 172.28.0.2: seq=1 ttl=64 time=0.105 ms

I also tried tested the port on the nodejs constainer and it seems to be there:

$ sudo docker port nodejs
8080/tcp -> 0.0.0.0:8080

EDIT:
I’m starting to think this is a google compute VM question as I have it running on my local linux box without any problem…have updated the title accordingly

Tags:

2

Answers


  1. 0

    You need to make sure they are on the same network. You can do it by adding the following lines in your compose file at the end

    networks:
  default:
    external:
      name: project.local

    Note, you have to create project.local network. When you run docker-compose up it’ll tell you how to do it.

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  2. 0

    As @ShipluMokaddim says, containers must be in the same network ort hey can’t hear each other, what I recommended is create a new network:

    version: '3'
services:
   angular:
      container_name: angular
      build: project-frontend
      ports:
        - "80:80"
      networks:
         - mynetwork
   nodejs:
     container_name: nodejs
     build: project-backend
     ports:
       - "8080:8080"
     networks:
       - mynetwork

networks:
   mynetwork:

    Whit this you will be fine.

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