How I can group containers in docker-compose? - docker

Question

I'm using this docker-compose.yml.
And I wanna make simpler and inherrit configuration, if its possible.
version: '2'
services:
nginx-proxy:
image: jwilder/nginx-proxy
container_name: nginx-proxy
ports:
- "80:80"
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
web_one:
container_name: "web_one"
build:
context: ./
dockerfile: web.docker
volumes:
- ./../one:/var/www
environment:
- VIRTUAL_HOST=whoami_one.local
links:
- app_one
app_one:
container_name: "app_one"
build:
context: ./
dockerfile: app.docker
volumes:
- ./../one:/var/www
links:
- db
web_two:
container_name: "web_two"
build:
context: ./
dockerfile: web.docker
volumes:
- ./../two:/var/www
environment:
- VIRTUAL_HOST=whoami_two.local
links:
- app_two
app_two:
container_name: "app_two"
build:
context: ./
dockerfile: app.docker
volumes:
- ./../two:/var/www
links:
- db
I have 15 sites with same configuration.
Can I make config simpler? Like this:
version: '2'
services:
nginx-proxy:
image: jwilder/nginx-proxy
container_name: nginx-proxy
ports:
- "80:80"
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
one:
extends:
file: common-services.yml
volumes:
- ./../one:/var/www
environment:
- VIRTUAL_HOST=whoami_one.local
two:
extends:
file: common-services.yml
volumes:
- ./../two:/var/www
environment:
- VIRTUAL_HOST=whoami_two.local
Or better?
Thank you!

Answer 1

UPDATE 31 Aug 2021 In the latest docker compose there's support for profiles https://docs.docker.com/compose/profiles/ so this problem would be perfectly solved by that new feature.
Another way is to create no-op services that depend on other services.
For example, in the following docker-compose.yml I have two namespaces, dev for services needed when developing the app, and metrics for services related to visualizing app metrics (since I'm not interested instarting those when developing).
version: "3"
services:
dev:
image: tianon/true
depends_on: ["postgres", "keycloak"]
metrics:
image: monroe/noop
depends_on: ["grafana"]
postgres: ...
keycloak: ...
grafana: ...