Meetup Docker 101

A gentle introduction to Docker

Transcript

1. Docker 101 Geoffrey Bachelet –@ubermuda
2. Who's talking? • Geoffrey Bachelet • Stage1.io : continuous staging • Gustave.io : interactive staging • Freelance Developer / Trainer @ubermuda
3. Container Engine? Based on the Linux kernel's LXC instructions Processes and resources isolation "chroot" on steroids / super lightweight VMs
4. Host OS Hypervisor Guest OS Guest OS Guest OS Guest OS App App App App Host OS Docker + LXC App App App App VMs vs Containers
5. VMs vs Containers LXC / Jails / Zones / etc Uses the host's kernel Boots in seconds 0 overhead (almost) Easy to pass around Hypervisor Boots a complete OS Boots in minutes Guest OS' overhead Several Go images
6. Image vs Container
7. credit: http:/ /docs.docker.io/en/latest/terms/image/ Image
8. Container credit: http:/ /docs.docker.io/en/latest/terms/image/
9. Create a container
10. $  docker  run  -­‐i  -­‐t  stackbrew/ubuntu  /bin/bash   ! root@21d86a0b8387:/#
11. Commit the container
12. root@21d86a0b8387:/#  apt-­‐get  install  nginx   root@21d86a0b8387:/#  exit   ! $  docker  ps  -­‐q  -­‐n  1   21d86a0b8387   ! $  docker  commit  21d86a0b8387  sflive/nginx   240198b750c3cc950c60005d6d24cae4fc2dbcc6c31e274574af68d4a2e8   ! $  docker  images   REPOSITORY            TAG                  IMAGE  ID   sflive/nginx          latest            240198b750c3
13. root@21d86a0b8387:/#  apt-­‐get  install  nginx   root@21d86a0b8387:/#  exit   ! $  docker  ps  -­‐q  -­‐n  1   21d86a0b8387   ! $  docker  commit  21d86a0b8387  sflive/nginx   240198b750c3cc950c60005d6d24cae4fc2dbcc6c31e274574af68d4a2e8   ! $  docker  images   REPOSITORY            TAG                  IMAGE  ID   sflive/nginx          latest            240198b750c3
14. root@21d86a0b8387:/#  apt-­‐get  install  nginx   root@21d86a0b8387:/#  exit   ! $  docker  ps  -­‐q  -­‐n  1   21d86a0b8387   ! $  docker  commit  21d86a0b8387  sflive/nginx   240198b750c3cc950c60005d6d24cae4fc2dbcc6c31e274574af68d4a2e8   ! $  docker  images   REPOSITORY            TAG                  IMAGE  ID   sflive/nginx          latest            240198b750c3
15. root@21d86a0b8387:/#  apt-­‐get  install  nginx   root@21d86a0b8387:/#  exit   ! $  docker  ps  -­‐q  -­‐n  1   21d86a0b8387   ! $  docker  commit  21d86a0b8387  sflive/nginx   240198b750c3cc950c60005d6d24cae4fc2dbcc6c31e274574af68d4a2e8   ! $  docker  images   REPOSITORY            TAG                  IMAGE  ID   sflive/nginx          latest            240198b750c3
16. Run the image
17. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
18. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
19. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
20. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
21. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
22. $  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'
23. $  docker  ps   CONTAINER  ID    ...    PORTS   923cb190dbc3    ...    0.0.0.0:49155-­‐>80/tcp   ! $  curl  http://localhost:49155   <html>   <head>   <title>Welcome  to  nginx!</title>   ...
24. $  docker  ps   CONTAINER  ID    ...    PORTS   923cb190dbc3    ...    0.0.0.0:49155-­‐>80/tcp   ! $  curl  http://localhost:49155   <html>   <head>   <title>Welcome  to  nginx!</title>   ...
25. Dockerfile
26. credit: http:/ /docs.docker.io/en/latest/terms/image/
27. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
28. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
29. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
30. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
31. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
32. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
33. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
34. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
35. FROM  stackbrew/ubuntu   ENV  DEBIAN_FRONTEND  noninteractive   RUN  apt-­‐get  install  -­‐y  nginx   ADD  nginx.conf  /etc/nginx/nginx.conf   EXPOSE  80   VOLUME  ["/var/www"]   CMD  ["-­‐g",  "daemon  off;"]   ENTRYPOINT  ["nginx"]
36. Features
37. • Docker CLI • run -d, attach, wait, ps, images, rm, rmi, etc • Networking • Ambassador, advanced routing, etc • Volumes • Data containers, bindmounting, etc • Docker Index • thousands of ready-made images • Docker Registry • private Docker Index • Remote API • dockerode, Docker-PHP, etc
38. Docker CLI • run  [-­‐d] : execute a container • attach : attach stdout • ps : list running containers • images : list existing images • rm  /  rmi : delete containers / images
39. Networking Link containers together Easy service discovery Ambassador pattern (service portability)
40. Volumes Like NFS for docker (except it works) Store data in data containers Easily backup data containers
41. Docker Index + Registry Thousands of ready-made images Private registry
42. Docker Remote API Rest(-ish) HTTP API for Docker ! Third party client libraries: dockerode, Docker-php, etc
43. Orchestration
44. Host OS THE INTERNET container nginx mysql php5-fpm
45. Host OS THE INTERNET nginx mysql php5-fpm /var/www /var/lib/mysql
46. Not built-in Lots of third-party tools ! maestro-ng, Fig, Gaudi, etc.
47. Pets vs Cattle
48. Use cases
49. Dev. environments Continuous integration Continuous deployment 0 downtime deployment Private PaaS
50. Thanks! https://speackerdeck.com/ubermuda/meetup-docker-101 Geoffrey Bachelet – @ubermuda