ruby on rails - Running different docker containers on same host/different port -


i have app composed of multiple rails projects, trying dockerize them, each app starts on different rails port :

  • main app: 1665
  • admin: 3002
  • website: 3000
  • ...

this docker-compose.yml file :

version: '2' services:    db:     image: postgres:9.6     container_name: acme_db     hostname: db.myapp.dev     hostname: db.ach     ports:       - "5432:5432"     volumes:       - myapp_pgdata:/var/lib/postgresql/data/pgdata     environment:       - pgdata=/var/lib/postgresql/data/pgdata       - virtual_host=db.myapp.dev     networks:       - generic    myapp:     image: acme/myapp     container_name: acme_myapp     hostname: app.myapp.dev     command: rails s -p 1665 -b '0.0.0.0'     volumes:       - ./myapp:/usr/src/app       - $ssh_auth_sock:/tmp/ssh_auth_sock     ports:       - "1665:1665"     depends_on:       - db     environment:       - ssh_auth_sock=/tmp/ssh_auth_sock       - rails_env=development       - virtual_host=myapp.dev     networks:       - generic    admin:     image: acme/admin     container_name: acme_admin     hostname: admin2.myapp.dev     command: rails s -p 3002 -b '0.0.0.0'     volumes:       - ./admin2:/usr/src/app       - $ssh_auth_sock:/tmp/ssh_auth_sock     ports:       - "3002:3002"     depends_on:       - myapp     environment:       - ssh_auth_sock=/tmp/ssh_auth_sock       - rails_env=development       - virtual_host=admin2.myapp.dev     networks:       - generic    website:     image: acme/website     container_name: acme_website     hostname: web.myapp.dev     command: rails s -p 3001 -b '0.0.0.0'     volumes:       - ./website:/usr/src/app       - $ssh_auth_sock:/tmp/ssh_auth_sock     ports:       - "3001:3001"     environment:       - ssh_auth_sock=/tmp/ssh_auth_sock       - rails_env=development       - virtual_host=myapp.dev     networks:       - generic  volumes:   myapp_pgdata:     external: true  networks:   generic:     external: true

running each app works fine, have problem when applications need communicate between them, instance website need forward http request main app, , when does, tries resolve uri: http://app.myapp.dev:1665/register and, resolved ip 127.0.0.1 instead of myapp docker container ip.

how can manage situation ? should use different hostnames each container ? ideally avoid dns resolution rails tries hit app.myapp.dev:1665 instead of resolving app.myapp.dev , resolving 127.0.0.1:1665

btw, using jwilder/nginx-proxy resolve containers hostnames laptop.

any thoughts ?

your setup allows containers resolve each other names through 'network' set docker-compose.

so website should able hit main app through http://myapp:1665/register


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