title: Sharing installed tools from one container to all containers with docker compose
body: <p>I am pretty new with Docker, and understanding how containers work and work together. I am creating a LEMP stack where i have nginx and php7-fpm as seperate containers. Each one has a Dockerfile and basically creates all i need. My issue though is when installing tools (such as ffmpeg, exiftool, etc..) in one container, is not available with the other container. </p>
  
  <p>Is there any possible to have these tools available within all containers?</p>