Dockerizing development workflow
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This document provides an overview of Docker, including its history and community, what it is, how it compares to virtual machines and native environments, its internal architecture involving images, layers and containers, common use cases, and a demonstration of basic Docker commands. Docker is an open source platform for automating application development by packaging applications into containers that can be easily built, shipped and run on any infrastructure. It provides portability and versioning of applications with minimal overhead compared to virtual machines.
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Dockerizing development workflow
- 1. Dockerizing development workflow ITRally 16 May 2015 Orest Ivasiv Software engineer, Softserve Docker hobbyist
- 2. Outline 1. What is Docker? 2. Internals of Docker 3. Docker basic commands 4. Sample usage
- 3. History source Wikipedia Docker was released as open source in March 2013
- 4. History February 2013: private repo, with liveral access (~200 people had access and helped to review, contribute, give feedback) March 2013: Docker 0.1 release at PyCon: - requires LXC, AUFS; - works on Debian/Ubuntu kernels June 2014: Docker 1.1, released at DockerCon May 12 2015: Docker 1.6.2, release 3 days ago
- 5. Docker Community 21500+ Github Stars 900+ Github Contributors ~50% of the commits are done by community
- 6. What is Docker? Docker is an open source platform to automate development cycle of applications inside software containers. Build → ship → run any app, anywhere Build: package your application in a container Ship: move that container from a mashine to another Run: execite that container (i.e. your application) Any application: anything that runs on Linux Anywhere: local VM, cloud instance, bare metal, etc.
- 7. Docker Host OS requirement Linux kernel 3.8+ Union file system - AUFS, btrfs, vfs or DeviceMapper
- 8. Docker vs VM Containers vs VMs. Diagram source: Docker Inc. There's a great StackOverflow answer showing the differences(http://stackoverflow.com/questions/16047306/how- is-docker-io-different-from-a-normal-virtual-machine)
- 9. Docker vs VM Startup time is less for Docker than VMs (super fast) Docker images have much smaller size Snapshot process is faster in Docker than VMs Docker images have more portability Docker provides versioning of images Docker images do not have states Don't need SSH for access
- 10. Docker vs native Docker helps to avoid lib version conflicts Docker has no or minimal overhead while using resource for visualization
- 11. Docker Linux technology stack Docker can use different interfaces to access virtualization features of the Linux kernel. Diagram source: Docker Inc.
- 12. Docker architecture Docker Client Docker Daemon Docker Registry
- 13. Docker Internals Docker image(http://docs.docker.com/terms/image/) Docker layer(http://docs.docker.com/terms/layer/) Docker container(http://docs.docker.com/terms/container/) Docker repository(http://docs.docker.com/terms/repository/) Docker registry(http://docs.docker.com/terms/registry/)
- 14. Docker Layers
- 15. Docker Layers
- 16. Docker Layers
- 17. Docker Layers
- 18. Use cases 1. Docker for local application development and test Worksonmymachine→Worksagainonmymachinetomorrow→Worksonatestmachine 2. Docker for development team collaboration Worksonmymachine→Worksonyourmachine 3. Docker for continuous integration -Complicatedconfigurationofvarioustypesofbuildjobs(e.g.,Maven,GCCandJUnit) -Needforacleanenvironmentforthebuildortest,toeliminatepossiblecontaminants -ManagingthetotalexecutiontimeoftheCIworkflow 4. Docker for production application deployment Worksonmymachine→WorksonQAmachines→Works(thesame)onproductionhardware →Staysworking(securely)ontheproductionenvironment 5. Docker for creating a private PAAS
- 20. Demo time
- 21. References Official Docker documentation(http://docs.docker.com/) Docker Cheat Sheet(https://github.com/wsargent/docker-cheat-sheet) Docker Use cases - Article(http://blogs.gartner.com/richard-watson/ok-get-dockers-great/) Linux Containers(https://linuxcontainers.org/) Introduction to Docker, December 2014 "Tour de France" Bordeaux Special Edition, Jérôme Petazzoni(http://www.slideshare.net/jpetazzo/introduction-to-docker-december-2014-tour-de-france-bordeaux-special-edition) Official hosted registry https://hub.docker.com/(https://hub.docker.com/)
- 22. Thank you Orest Ivasiv Software engineer, Softserve Docker hobbyist [email protected](mailto:[email protected]) http://halyph.com(http://halyph.com) @halyph(http://twitter.com/halyph)