Container Orchestration

• Deploy Containers at Scale
• Multiple Copies, Multiple Nodes
• Handle Routing, Restarting
• Lab 2 - Automate!

Image Source: DevopsCube

Docker Compose

• Isolated Environments
• Preserve Data
• Infrastructure as Code
• Easily Apply Changes
• Portability

Docker Compose File

Filename: docker-compose.yml

services:                   # top level item
  nginx:                    # name of service
    image: nginx:alpine     # image to use
    container_name: nginx1  # name of container
  mysql:
    image: mysql:latest
    container_name: mysql

Docker Compose Commands

• docker compose up [-d]
• docker compose down
• docker compose start
• docker compose run [service]

Composability

# docker-compose.yml
services:
  webserver:
    container_name: webserver
    extends:
      file: nginx.yml
      service: nginx
    # custom configuration here

# nginx.yml
services:
  nginx:
    image: nginx:alpine
    # default configuration here