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Chapter 53: Docker Compose Tutorial: Services, depends_on Healthchecks, Env Files, Profiles, Overrides, Scaling and Every Command

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One file for the whole app: nginx, API, database and cache. Docker Compose starts everything with one command. Today we cover healthchecks, env files, profiles, overrides and every compose command.

What you will learn in this chapter

  • Why Compose and the compose.yaml layout
  • Every common service key
  • depends_on with healthchecks
  • Env files, interpolation and secrets
  • Volumes and networks
  • Profiles, override files, include and extends
  • Scaling and watch mode
  • Every docker compose command
  • Compose Watch vs nodemon
  • Dev vs prod files on an Ubuntu VM
  • Wait-for-DB and retry patterns
  • Watchtower auto-updates

All Docker commands in one place

Every docker command step by step on one running example (build, run, exec, logs, volumes, networks, Compose, cleanup) with a cheat sheet: All Docker Commands Step by Step with Examples

Concepts in this chapter

  1. 53.1Why Compose: one file for the whole app
  2. 53.2Service keys: build, image, command, environment, ports, restart
  3. 53.3depends_on with healthchecks: start in the right order
  4. 53.4Environment files, interpolation and secrets
  5. 53.5Volumes and networks in Compose
  6. 53.6Profiles: optional services
  7. 53.7Override files, multiple -f, include and extends
  8. 53.8Scaling, watch mode and the full 3-tier stack
  9. 53.9Every docker compose command: full reference
  10. 53.10Compose Watch vs nodemon and the node_modules volume trick
  11. 53.11Separate dev and prod Compose files, deployed to an Ubuntu VM
  12. 53.12Wait-for-DB and retry patterns beyond depends_on
  13. 53.13Watchtower: automatic image updates for Compose apps

The chapter recap is at the end of the last concept page.

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