Docker Compose

---

• configure relationships between containers
• Save our docker container run settings in easy-to-read file
• Create one-liner developer environment startups

1. YAML-formatted file that describes our solution options for:
   • containers
   • networks
   • volumes
2. A CLI tool docker-compose used for local dev/test automation with those YAML files

   ---

   docker-compose.yaml example

version: '2'
#same as 
#docker run -p 80:4000 -v $(pwd):/site bretfisher/jekyll-serve

services:
  jekyll:
    image: bretfisher/jekyll-serve
    volumes:
      - .:/site
    ports:
      - '80:4000'

. current working directory

For more exmaples: https://docs.docker.com/

---

docker-compose CLI

• CLI tool comes with Docker for Windows/Mac, but separate. download for Linux
• Not a production-grade tool but idead for local development and test

docker-compose +

up setup volumes/networks and start all containers
down stop all containeres and remove containers/volumes/networks

:ro used in volumes. read-only. (cannot change within container)

if all your projects had a Dockerfile and docker-compose.yml then new developer onboarding would be:

• git clone github.com/some/software
• docker-compose-up
  Boom! Done!