Getting Started with Docker
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This document discusses Docker and provides an introduction and overview for getting started with Docker. It begins with discussing the challenges of managing complex software stacks across different environments and how Docker addresses this through containerization and separation of concerns. It then covers downloading and installing Docker, basic Docker commands like run, images, ps, and explains a "Hello World" example. Finally, it demonstrates building a simple Whalesay image and running MySQL and WordPress in linked Docker containers using both the Docker CLI and Docker Compose.
Getting Started with Docker
- 2. Suggested Topics • Composer • Vagrant • Kafka • React / React Native / Flow • More Docker • General JavaScript • Organization principals • Node JS / Node promises • GIS • SQL
- 3. Topics • CoffeeScript • Unit Testing • Polyfills • Interaction Design / Improving User Experience • Mobile testing • A/B Testing • Regression testing • Performance optimization • Dev tools • D3.js / three.js / processing's / etc • Source Maps • Static site generators • Accessibility for Rich Internet applications (ARIA) • GeoJSON and mapping API’s • Electron • Node.js • Kalabox • Server Security • GreenSocks Animations • Google Analytics • Test Driven Development • Command Line
- 4. Mark Aplet @visual28 Web Developer at Symsoft
- 5. Docker An Introduction & Getting Started
- 6. Agenda • Background • Installation • Commands • Hello World • Dockerfile • Docker Compose
- 7. What’s the Big Deal?
- 8. LAMP Once upon a time…
- 9. The Challenge Today Static website nginx 1.5 + modsecurity + openssl + bootstrap User DB postgresql + pgv8 + v8 Analytics DB hadoop + hive + thrift + OpenJDK Web frontend Ruby + Rails + sass + Unicorn Queue Redis + redis-sentinel Background workers Python 3.0 + celery + pyredis + libcurl + ffmpeg + libopencv + nodejs + phantomjs API endpoint Python 2.7 + Flask + pyredis + celery + psycopg + postgresql-client Development VM QA server Disaster recovery Contributor’s laptop Production Servers Production Cluster Customer Data Center
- 10. Matrix From Hell Static website Web frontend Background workers User DB Analytics DB Queue Development VM QA Server Single Prod Server Onsite Cluster Public Cloud Contributor’s laptop Customer Servers ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- 12. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- 15. Docker Container Static website Web frontendUser DB Queue Analytics DB Development VM QA server Public Cloud Contributor’s laptop Production Cluster Customer Data Center
- 16. Virtualization
- 17. Virtual Machines • Hardware VM’s been around a long time • Allows multiple guest systems to live on a single host • Snapshots “freeze” state at that point • Can be migrated from one host to another
- 18. VM Problems • Ship too many bits • Each VM contained independent OS and resource pool • Scale may not be of value
- 19. Innovation • Created opportunity to cut out unnecessary features to create lightweight process virtualization • lead to creation of LXC containers. (Linux Containers) • Much smaller OS with minimal resource requirements that boots in seconds
- 21. VM vs Container Hypervisor (Type 2) Host OS Server Guest OS Bins/Lib s Docker VM Container App 1 Guest OS Bins/Lib s App 1 Guest OS Bins/Lib s App 2 Host OS Server App1 App1 App1 App2 App2 App2 App2 Bins/Libs Bins/Libs
- 22. Enter Docker • Removing of the unnecessary parts of OS continued • 2013 DotCloud (now Docker) really pushed the boundaries of lightweight process virtualization
- 23. Enter Docker • A Docker container unlike VM's or LXC does not require or include a separate OS • Docker instead relies on the Linux kernel functionality and uses resource
- 24. Get Started
- 25. Download • docker.com • Docker for Mac/Win for newer systems • Docker toolbox for older systems
- 26. Helpful • Prior knowledge of Linux is helpful • Use Docker CLI in terminal
- 27. Commands COMMANDS ps = Process images = images on host run = run a command rm = Remove Process rmi = remove image FLAGS -a = All Hidden -d = detached mode -ti = Terminal Interactive -p = Port number -v = Volume
- 28. DEMO
- 29. Hello World $ docker run hello-world
- 30. Whalesay $ docker run docker/whalesay cowsay foobar
- 31. Whalesay: Dockerfile FROM docker/whalesay:latest RUN apt-get -y update && apt-get install –y fortunes CMD /usr/games/fortune -a | cowsay $ docker build -t docker-whale .
- 32. MySQL $ docker pull mysql $ docker run --name wordpressdb -e MYSQL_ROOT_PASSWORD=password -e MYSQL_DATABASE=wordpress -d mysql:5.7
- 33. WordPress $ docker pull wordpress $ docker run -e WORDPRESS_DB_PASSWORD=password --name mywordpress --link wordpressdb:mysql -p 8080:80 -d -v "$PWD/":/var/www/html wordpress
- 34. WordPress: Docker-Compose version: '2' services: db: image: mysql:5.7 volumes: - "./.data/db:/var/lib/mysql" restart: always environment: MYSQL_ROOT_PASSWORD: wordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress wordpress: depends_on: - db image: wordpress:latest links: - db ports: - "8080:80" restart: always environment: WORDPRESS_DB_HOST: db:3306 WORDPRESS_DB_PASSWORD: wordpress volumes: - ./wp-content/:/var/www/html/wp-content