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I've got a simple webapp that has a web-server and a restful api-service. I cannot get the web-server app to connect to the restful api-service using the service name. I can reach the api service if I use the IP address.

Here's my compose file

version: '3'

services:

  my-app:
    image: my-app:1.0.0
    ports: 
      - "5000:5000"
    networks:
      - my-network

  my-api:
    image: my-api:1.0.0
    ports: 
      - "3000:3000"
    networks:
      - my-network

networks:
  my-network:

I'm running a swarm on a single machine with 1 replica. If I connect with the local IP address in the web-app it connects but fails when I try http://my-api:3000

Any ideas?

David Broadhurst
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  • Your localhost doesn't have a DNS to know what `my-api` represents, or are you trying to connect between services? – OneCricketeer Jun 25 '18 at 02:14
  • Yes, this is connecting two services, my-app and my-api I know I won't be able to reach from the host but I expected anything inside the swarm would be able to reach other containers by service name? – David Broadhurst Jun 25 '18 at 02:23
  • It should, yes. I've not used Swarm myself, however. My suggestion would be to attach to one container and run commands such as nslookup and traceroute to diagnose networking problems – OneCricketeer Jun 25 '18 at 10:51

1 Answers1

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I found I could ping the api from the app using the dns name. The issue was even though the app is in the swarm the app is running outside the swarm

David Broadhurst
  • 11
  • 2