Edmonton Go September 2014 - Docker

Introduction to Docker and basic deployment of Go applications

References

progrium/buildstep: https://registry.hub.docker.com/u/progrium/buildstep/
google/golang-runtime: https://registry.hub.docker.com/u/google/golang-runtime/
tapasd: https://github.com/fnichol/tapasd
Official Docker Installation Instructions: https://docs.docker.com/installation/#installation
boot2docker: http://boot2docker.io/
dvm: http://fnichol.github.io/dvm/
Docker Website: https://www.docker.com/
The Docker Book: http://dockerbook.com/
DockerCon 2014 Talks: https://www.youtube.com/user/dockerrun/

Photo Credits

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Transcript

1. Docker Edmonton Go September, 2014 Fletcher Nichol @fnichol
3. What is Docker?
4. –Docker Inc. “Develop, Ship and Run Any Application, Anywhere.”
5. –Docker Inc. “Docker is a platform for developers and sysadmins to develop, ship, and run applications. Docker lets you quickly assemble applications from components and eliminates the friction that can come when shipping code. Docker lets you get your code tested and deployed into production as fast as possible.”
6. –Me “Docker is version control for your application processes.”
7. Why Docker?
8. Faster delivery of applications
9. Deploying & scaling more easily
10. Higher density & running more workloads
11. Components and Concepts
12. Docker Daemon Runs on host machine ! Listens on Unix socket or TCP port ! Pre-defined API ! “docker -D”
13. docker Binary Primary UI for Docker ! CLI tool ! Interacts with Docker Daemon ! “docker ps”
14. Docker Container Container-based virtualization ! Shared Linux Kernel ! Isolated processes, users, resources ! Started from an Image ! “docker run nginx”
15. Layered format, using union file systems ! Can be tagged and versioned ! Source code for containers! ! “docker images” Docker Image
16. Dockerfile Build images automatically from instructions ! Each instruction creates an image layer which is cached ! “docker build -t <tag> .”
17. Docker Hub Primary source of registries of images ! Sharing mechanism for public images ! “docker pull ubuntu”
18. Docker Demo
20. Go +
21. Magic I: progrium/buildstep https://registry.hub.docker.com/u/ progrium/buildstep/ ! Heroku-style application builds using Docker and Buildpacks. ! Used by Dokku to make a mini-Heroku.
22. > tar cC /path/to/your/app . | ./buildstep myapp > docker run -d myapp /bin/bash -c "/start web"
23. Magic II: google/golang- runtime https://registry.hub.docker.com/u/ google/golang-runtime/ ! Automatically bundle a Go application with its dependencies ! No additional Dockerfile instructions
24. > echo “FROM google/golang-runtime” > Dockerfile > docker build -t myapp . > docker run -d myapp
25. Not Magic: Roll Your Own Very small image footprint ! All software and dependencies are known ! No need for compiler on running image
26. Go Application System Requirements • ?? • ?? • ??
27. FROM ubuntu MAINTAINER Fletcher Nichol <fnichol@nichol.ca> ! RUN apt-get update RUN apt-get install -y autoconf bison build-essential curl git other- stuff amazing-collection-of-wasted-bytes-cmon-why ! # …
28. > docker images ubuntu | \ grep latest | awk '{print $(NF-1) " " $NF}’ 194.2 MB
29. > docker images progrium/busybox | \ grep latest | awk '{print $(NF-1) " " $NF}' 4.787 MB
30. Deployment Example: tapasd https://github.com/fnichol/tapasd ! Daemon written in Go ! Packaged in minimal Docker image ! Credentials injected on container start
31. > ./bin/tapasd -help Usage of ./bin/tapasd: -concurrency=4: data directory for downloads -data=“/tmp/tapasd": data directory for downloads -interval=21600: number of seconds to sleep between retrying -oneshot=false: check and download once, then quit -pass="[required]": pass for RubyTapas account (required) -user="[required]": user for RubyTapas account (required)
32. FROM progrium/busybox MAINTAINER Fletcher Nichol <fnichol@nichol.ca> ! # provide /etc/ssl/certs/ca-certificates.crt to container RUN opkg-install ca-certificates RUN for cert in `ls -1 /etc/ssl/certs/*.crt | grep -v /etc/ssl/certs/ ca-certificates.crt`; do cat "$cert" >> /etc/ssl/certs/ca- certificates.crt; done ! ADD https://github.com/fnichol/tapasd/releases/download/v0.1.0/ tapasd_linux_amd64 /bin/tapasd RUN chmod +x /bin/tapasd ! VOLUME ["/data"] ! ENTRYPOINT ["/bin/tapasd", "-data=/data"]
33. > docker run -d fnichol/tapasd -user="user@example.com" -pass="nope"
34. > docker images fnichol/tapasd | grep latest | awk '{print $(NF-1) " " $NF}' 21.45 MB
35. Getting Started
36. Official Guides https://docs.docker.com/installation/ #installation
37. boot2docker http://boot2docker.io/
38. dvm http://fnichol.github.io/dvm/
39. Further Reading
40. Docker Website https://www.docker.com/
41. The Docker Book James Turnbull http://dockerbook.com/
42. DockerCon 2014 Videos https://www.youtube.com/user/ dockerrun/
43. Thanks! Edmonton Go September, 2014 Docker ! Fletcher Nichol @fnichol
44. Photo Credits https://flic.kr/p/9abnoA https://flic.kr/p/eSN6wQ https://flic.kr/p/eP3dje https://flic.kr/p/iuZJCa https://flic.kr/p/5Sob5d https://flic.kr/p/a3NYdi https://flic.kr/p/jbQF9 https://flic.kr/p/2zyPrm https://flic.kr/p/6P7h6L https://flic.kr/p/aoCttn https://flic.kr/p/7S6vi1 https://flic.kr/p/aYqgh https://flic.kr/p/6hrYGj https://flic.kr/p/7TphJe https://flic.kr/p/5vMgkz https://flic.kr/p/aip3KU https://flic.kr/p/i1Lp1 https://flic.kr/p/nJLGvt