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Docker 101 Geoffrey Bachelet –@ubermuda

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Who's talking? • Geoffrey Bachelet • Stage1.io : continuous staging • Gustave.io : interactive staging • Freelance Developer / Trainer @ubermuda

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Container Engine? Based on the Linux kernel's LXC instructions Processes and resources isolation "chroot" on steroids / super lightweight VMs

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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

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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

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Image vs Container

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credit: http:/ /docs.docker.io/en/latest/terms/image/ Image

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Container credit: http:/ /docs.docker.io/en/latest/terms/image/

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Create a container

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$  docker  run  -­‐i  -­‐t  stackbrew/ubuntu  /bin/bash   ! root@21d86a0b8387:/#

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Commit the container

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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

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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

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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

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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

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Run the image

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  run  -­‐p  80  sflive/nginx  nginx  -­‐g  'daemon  off;'

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$  docker  ps   CONTAINER  ID    ...    PORTS   923cb190dbc3    ...    0.0.0.0:49155-­‐>80/tcp   ! $  curl  http://localhost:49155       Welcome  to  nginx!   ...

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$  docker  ps   CONTAINER  ID    ...    PORTS   923cb190dbc3    ...    0.0.0.0:49155-­‐>80/tcp   ! $  curl  http://localhost:49155       Welcome  to  nginx!   ...

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Dockerfile

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credit: http:/ /docs.docker.io/en/latest/terms/image/

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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"]

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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"]

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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"]

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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"]

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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"]

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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"]

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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"]

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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"]

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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"]

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Features

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• 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

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Docker CLI • run  [-­‐d] : execute a container • attach : attach stdout • ps : list running containers • images : list existing images • rm  /  rmi : delete containers / images

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Networking Link containers together Easy service discovery Ambassador pattern (service portability)

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Volumes Like NFS for docker (except it works) Store data in data containers Easily backup data containers

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Docker Index + Registry Thousands of ready-made images Private registry

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Docker Remote API Rest(-ish) HTTP API for Docker ! Third party client libraries: dockerode, Docker-php, etc

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Orchestration

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Host OS THE INTERNET container nginx mysql php5-fpm

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Host OS THE INTERNET nginx mysql php5-fpm /var/www /var/lib/mysql

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Not built-in Lots of third-party tools ! maestro-ng, Fig, Gaudi, etc.

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Pets vs Cattle

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Use cases

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Dev. environments Continuous integration Continuous deployment 0 downtime deployment Private PaaS

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Thanks! https://speackerdeck.com/ubermuda/meetup-docker-101 Geoffrey Bachelet – @ubermuda