How to run a command from another container using docker-compose?

Question

Virtualization

Starting to master docker, I created docker-compose.yml with the following content:

version: '3'
services:
    app:
        build: app
        stdin_open: true
        tty: true
        restart: always
    php:
        build:
            context: ./php
        restart: always
        depends_on:
            - app

How can I execute, let 's say php -vfrom the console in the app container?

Answer 1

1. ssh
2. install docker in the "app" container, mount /var/run/docker.sock and manage docker on the host from within the container.
Only in this case your container becomes omnipotent, actually gets root on the host.