Introduction to Containers and Docker
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The document introduces containers and Docker. It discusses the problems with traditional virtualization approaches for managing and deploying code. Containers provide a lightweight virtualization method that packages code and dependencies together so the application runs reliably from one computing environment to another. Docker is a tool that makes it easy to create, deploy and run containers. The document provides examples of using Docker to build container images from a Dockerfile, run containers, link containers together using Docker Compose, and share container images publicly on Docker Hub.
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Introduction to Containers and Docker
- 1. BADCamp 2015 DevOps Summit Introduction to Containers and Docker @RobLoach
- 2. Kalamuna. I build tools to bring great ideas into reality. RobLoach RobLoach rob@kalamuna.com Rob Loach
- 3. About Us Kalamuna makes the Internet for rabble-rousing organizations driven to tinker, critique, and change the way things are. We specialize in design, strategy, user experience, and development.
- 4. Containers
- 5. But first….
- 6. Why?
- 7. I can build environments!
- 8. But after a while... B
- 12. Managing and Deploying Code is Hard
- 13. Virtualization? ■ VirtualBox ■ VMWare ■ Vagrant ■ Puppet ■ Chef ■ etc
- 14. AWESOME!.... Buuuuuuuut ■ Slow performance ■ Images require a lot of space ■ Can be complex to set up ■ Updating takes forever
- 15. Containers!
- 16. Containers ■ Single-service provider ■ Build once, run everywhere ■ Re-usable software components ■ Bind and link services ■ Improve dependency management ■ Natively part of Linux runtime ■ Shared Kernal-space
- 17. Docker ■ Easy to use interface around Containers ■ Single “Dockerfile” configuration ■ “Hub” to share environments ■ Runs everywhere
- 18. Create a Container for each Service
- 19. Ship each individual Container
- 20. Fixes “Matrix From Hell”
- 21. Great Scott!
- 22. But how?
- 24. 2. Create a Dockerfile FROM Ubuntu RUN apt-get install nginx ADD . /web EXPOSE 80
- 25. 3. Build the Image docker build -t myapp .
- 26. 4. Run it! docker run -d -p 80:80 myapp
- 28. GIVE ME MORE! ■ Docker Compose ■ Orchestrate and link up a set of containers ■ Docker Swarm ■ Clustering of Docker containers, allowing creation and access to a pool of hosts ■ Docker Hub ■ Registry of Docker containers and images - Privately or Publicly
- 29. 5. Link Containers with Docker Compose web: build: . ports: - "80:80" links: - mysql mysql: image: mysql
- 30. 6. Share on Docker Hub
- 31. KalaBox Drupal development environment through Docker containers