Multi-container stack

Rancher 1.x
1

I have a stack made of 3 containers (db, app, and proxy).
When I run it via docker-compose everything works. However, when I try to start it using rancher CLI (rancher-compose -p newapp up) the containers don’t see each other.

Here the significant part of my docker-compose.yml

version: '2'

services:
  db:
    image: sigfrid/postgres
    ports:
      - 5432:5432
    network_mode: bridge
    labels:
      io.rancher.scheduler.affinity:host_label: app=newapp

  app:
    image: sigfrid/newapp
    ports:
      - 3000:3000
    links:
      - db
    depends_on:
      - db
    network_mode: bridge
    labels:
      io.rancher.scheduler.affinity:host_label: app=newapp

  proxy:
    image: sigfrid/nginx
      - 80:80
      - 443:443
    links:
      - app
    depends_on:
      - app
    network_mode: bridge
    labels:
      io.rancher.scheduler.affinity:host_label: app=newapp

Am I missing anything here?

2

Are these spread across multiple hosts or are they all on the same single host?

3

Same host, see labels.

Thanks

4

Saw the labels…more than one host could have that label, thats why I wanted to clarify.

Can you ellaborate on “dont see each other”? How are they trying to see each other.
Does it work if you drop network_mode: bridge (which would cause it to use the rancher overlay network)?

5

@cjellick you are right, I could have multiple hosts with the same label but I don’t. There is only 1 host with the newapp label.

the two errors I get are the following.

thx-app-1 | 2018-06-07T09:22:52.063050743Z PG::ConnectionBad: could not translate host name “db” to address: Name or service not known

th-proxy-1 | 2018-06-07T08:45:07.965236834Z 2018/06/07 08:45:07 [emerg] 1#1: host not found in upstream “app” in /etc/nginx/conf.d/default.conf:38

if I drop network_mode: bridge nothing starts

INFO[0000] Existing volume template found for postgres-data-volume
INFO[0000] [0/3] [db]: Creating
INFO[0000] Creating service db
INFO[0001] [0/3] [db]: Created
INFO[0001] [0/3] [app]: Creating
INFO[0001] Creating service app
INFO[0002] [0/3] [app]: Created
INFO[0002] [0/3] [proxy]: Creating
INFO[0002] Creating service proxy
INFO[0002] [0/3] [proxy]: Created
INFO[0002] Existing volume template found for postgres-data-volume
INFO[0002] [0/3] [db]: Starting

until it times out.

I have also tried io.rancher.container.network: true but it seems this is ignored. See Docker compose and managed network

Thanks.

6

@cjellick any ideas what that is happening?

Thanks for your help.

7

Your config seems pretty simple, so try to create your stack from UI with default network option offered (not host) & then download docker & rancher composes to see how they differ from yours.

9

If I try to create the stack from UI I get an error while the first container is trying to activate (Timeout getting IP address). Please note my docker0 bridge has been customized (bip=192.168.134.1/24) due to a IP conflict within my LAN. https://docs.docker.com/v17.09/engine/userguide/networking/default_network/custom-docker0/
This hopefully can provide some insight in the issue I’m facing.

Thanks.