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TODAY I LEARNED

Docker compose services with health checks

If you need to add extra checks for services to be up and running before starting another one, you can use healtcheck property:

services:
  pg:
    image: pg/pg-12
    ports:
      - 5432:5432
    healtcheck:
      test: [ "CMD-SHELL", "pg_isready -U postgres" ]
      interval: 5s
      timeout: 5s
      retries: 5
  redis:
    image: redis:5.0.4-alpine
    ports:
      - 6380:6379
    healthcheck:
      test: [ "CMD", "redis-cli", "ping" ]
      interval: 5s
      timeout: 5s
      retries: 5
  app:
    image: railsapp
    depends_on:
      pg:
        condition: service_healthy
      redis:
        condition: service_healthy
    ports: ['3000:3000']
    command: |
      bash -c "bundle exec rails s"

Learned by Edwin Cruz on Sep 8, 2021

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