Docker compose yml inheritance - docker

Question

There are two tasks: run app container, run almost the same deploy-app container. The differences for them, for example, that deploy container does not have port sharing.
So, I made configs for this tasks...
./dockerfiles/base.yml:
app:
net: docker_internal_net
environment:
APPLICATION_SERVER: "docker"
./dockerfiles/base.run.yml:
app:
container_name: project-app
# set the build context to the project root
build: ..
volumes:
- /var/log/project/nginx:/var/log/nginx
- /var/log/project/php-fpm:/var/log/php5-fpm
- ..:/var/www/project
./dockerfiles/dev/run.yml:
app:
dockerfile: ./dockerfiles/dev/run-app/Dockerfile
ports:
- "80:80"
- "22:22"
environment:
DEV_SSH_PUBKEY: "$SSH_PUBLIC_KEY"
APPLICATION_PLATFORM: "dev"
./dockerfiles/dev/build.yml:
app:
container_name: project-app-deploy
# set the build context to the project root
build: ../..
dockerfile: ./dockerfiles/dev/build-app/Dockerfile
environment:
APPLICATION_PLATFORM: "dev"
volumes:
- ../..:/var/www/project
So I can tun the app container like this:
$ docker-compose -f ./dockerfiles/base.yml -f ./dockerfiles/base.run.yml -f ./dockerfiles/dev/run.yml up -d app
Creating project-app
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dae45f3f2c42 dockerfiles_app "/sbin/my_init" 2 seconds ago Up 1 seconds 0.0.0.0:2223->22/tcp, 0.0.0.0:8081->80/tcp project-app
Everything okay. But if then I trying to run deploy-app container, I will receive this message:
$ docker-compose -f ./dockerfiles/base.yml -f ./dockerfiles/dev/build.yml up -d app
Recreating project-app
WARNING: Service "app" is using volume "/var/www/project" from the previous container. Host mapping ".." has no effect. Remove the existing containers (with `docker-compose rm app`) to use the host volume mapping.
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
53059702c09b dockerfiles_app "/sbin/my_init" 6 seconds ago Up 4 seconds 22/tcp, 80/tcp project-app-deploy
This is because both of them are shared one local directory? But why I can run deploy-app container manually without docker-compose?
$ docker run -d --net docker_internal_net -e APPLICATION_SERVER=docker -e APPLICATION_PLATFORM=dev --name project-app-deploy -v ..:/var/www/project mybaseimage
86439874b8df561f529fde0d1e31824d70dc7e2a2377cd529331a2d7fcb00467
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
86439874b8df mybaseimage "/sbin/my_init" 4 seconds ago Up 3 seconds 22/tcp, 80/tcp project-app-deploy
40641f02a09b dockerfiles_app "/sbin/my_init" 2 minutes ago Up 2 minutes 0.0.0.0:2223->22/tcp, 0.0.0.0:8081->80/tcp project-app

Answer 1

I've solved my problem with the extend command in that way:
1) making changes into my ./dockerfiles/dev/build.yml file:
deploy-app:
extends:
file: ../base.yml
service: app
container_name: project-app-deploy
# set the build context to the project root
build: ../..
dockerfile: ./dockerfiles/dev/build-app/Dockerfile
environment:
APPLICATION_PLATFORM: "dev"
volumes:
- ../..:/var/www/project
2) run my deploy app container so:
$ docker-compose -f ./dockerfiles/dev/build.yml up -d deploy-app
Building deploy-app
...
Successfully built 74750fe274c6
Creating lovetime-app-deploy
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
9bb2af79ffaa dev_deploy-app "/sbin/my_init" 5 seconds ago Up 4 seconds 22/tcp, 80/tcp project-app-deploy
812b8824f1f0 dockerfiles_app "/sbin/my_init" 3 minutes ago Up 3 minutes 0.0.0.0:2223->22/tcp, 0.0.0.0:8081->80/tcp project-app
$ docker inspect -f '{{ .Mounts }}' project-app-deploy
[{ ...... /var/www/project rw true}]
Update:
According to documentation, this command is not supported in newer compose versions:
The extends keyword is supported in earlier Compose file formats up to Compose file version 2.1 (see extends in v1 and extends in v2), but is not supported in Compose version 3.x.