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Chapter 56: Docker CI/CD with Jenkins and ECR, Deploy to Amazon ECS, Troubleshooting, Best Practices and Interview Questions

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This is the last Docker chapter: push from Jenkins to ECR, deploy on ECS, troubleshoot a container at 2 AM, keep images small, follow best practices, and get ready for interview questions.

What you will learn in this chapter

  • Jenkins pipeline to ECR
  • ECS Fargate deployment
  • Troubleshooting order and exit codes
  • Image size optimisation
  • Best practices checklist
  • Complete CLI reference
  • Interview questions
  • Debugging distroless with docker debug and netshoot
  • Registries: GHCR, Harbor, mirrors and Hub limits
  • Disk cleanup and log limits
  • Reaching the host with host.docker.internal and extra_hosts
  • Integration tests with Testcontainers

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. 56.1CI/CD: a Jenkins pipeline that builds, scans and pushes to Amazon ECR
  2. 56.2Deploy containers to Amazon ECS with Fargate
  3. 56.3Troubleshooting order and exit codes: a playbook for broken containers
  4. 56.4Image size: make images small, fast and safe
  5. 56.5Docker best practices: a checklist for every service
  6. 56.6The complete Docker CLI reference, grouped and tried once each
  7. 56.7Docker interview questions, answered with commands
  8. 56.8Debugging small and distroless containers with docker debug and netshoot
  9. 56.9Registries: Docker Hub limits, GHCR, Harbor and pull-through mirrors
  10. 56.10Disk cleanup and log limits: stop Docker from filling the disk
  11. 56.11Reaching the host from a container: host.docker.internal and extra_hosts
  12. 56.12Testcontainers: integration tests against a real Postgres

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

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