Share container definition in multiple docker compose

Question

In my docker-compose there is a nginx proxy container definition:

nginx-proxy:
  image: jwilder/nginx-proxy
  ports:
    - "80:80"
  volumes:
    - /var/run/docker.sock:/tmp/docker.sock:ro

I would like to define this container in multiple docker-compose.yml file (one per project).

How can I do that, without stopping each time the container (because is using the port 80)? The idea is: if there are no nginx-proxy containers running, run this, otherwise use the running one.

I think you will will need a script. Something like: ping or check your nginx using port 80, if it isn`t up, run docker-compose run nginx-proxy to create one. — levi, Oct 05 '16 at 15:51
You should use solution from [Here](http://stackoverflow.com/questions/35113957/running-multiple-projects-using-docker-which-each-runs-with-docker-compose) — timiTao, May 17 '17 at 17:14

score -1 · Answer 1 · answered Aug 09 '17 at 15:25

You can have one nginx for all your projects. In that case you need to have only_nginx/docker-compose.yml file where you have ] nginx service and use

projectx_service:
    extends:
        file: /path_to/only_nginx/docker-compose.yml
        service: nginx-proxy
    ...

this kind of block in your every project docker-compose files.

Example:

only_nginx/docker-compose.yml :

nginx-proxy:
image: jwilder/nginx-proxy
ports:
    - "80:80"
volumes:
    - /var/run/docker.sock:/tmp/docker.sock:ro

project1/docker-compose.yml

project1_service:
    extends:
        file: /path_to/only_nginx/docker-compose.yml
        service: nginx-proxy
    ...

project2/docker-compose.yml

project2_service:
    extends:
        file: /path_to/only_nginx/docker-compose.yml
        service: nginx-proxy
    ...

This doesn't solve the original problem, but just avoid duplication of code. If I run `docker-compose up` on both projects, first is ok, second always tell me "... Bind for 0.0.0.0:80 failed: port is already allocated". Moreover, the `extends` keyword is deprecated in Docker Compose v3 — Oscar Fanelli, Aug 09 '17 at 21:11

Share container definition in multiple docker compose

1 Answers1