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Dockerfile Basics Workshop #1

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Dockerfile basics
docker workshop #1
at GeekDom / Rackspace
Dockerfiles
• Dockerfiles = image representations
• Simple syntax for building images
• Automate and script the images creation
FROM
• Sets the base image for subsequent instructions
• Usage: FROM <image>
• Example: FROM ubuntu
• Needs to be the first instruction of every Dockerfile
• TIP: find images with the command: docker search
RUN
• Executes any commands on the current image and commit the
results
• Usage: RUN <command>
• Example: RUN apt-get install –y memcached
FROM ubuntu
RUN apt-get install -y memcached
• Is equivalent to:
docker run ubuntu apt-get install -y memcached
docker commit XXX
docker build
• Creates an image from a Dockerfile
• From the current directory = docker build
• From stdin = docker build - < Dockerfile
• From GitHub = docker build github.com/creack/docker-firefox
• TIP: Use –t to tag your image
Example: Memcached
FROM ubuntu
RUN echo "deb http://archive.ubuntu.com/ubuntu precise main
universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get install -y memcached
• http://instacached.com/D1
• Docker build –t memcached .
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Dockerfile Basics Workshop #1

  • 1. Dockerfile basics docker workshop #1 at GeekDom / Rackspace
  • 2. Dockerfiles • Dockerfiles = image representations • Simple syntax for building images • Automate and script the images creation
  • 3. FROM • Sets the base image for subsequent instructions • Usage: FROM <image> • Example: FROM ubuntu • Needs to be the first instruction of every Dockerfile • TIP: find images with the command: docker search
  • 4. RUN • Executes any commands on the current image and commit the results • Usage: RUN <command> • Example: RUN apt-get install –y memcached FROM ubuntu RUN apt-get install -y memcached • Is equivalent to: docker run ubuntu apt-get install -y memcached docker commit XXX
  • 5. docker build • Creates an image from a Dockerfile • From the current directory = docker build • From stdin = docker build - < Dockerfile • From GitHub = docker build github.com/creack/docker-firefox • TIP: Use –t to tag your image
  • 6. Example: Memcached FROM ubuntu RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update RUN apt-get install -y memcached • http://instacached.com/D1 • Docker build –t memcached .
  • 7. # Commenting • # • http://instacached.com/D2 # Memcached # # VERSION 1.0 # use the ubuntu base image provided by dotCloud FROM ubuntu # make sure the package repository is up to date RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update # install memcached RUN apt-get install -y memcached
  • 8. MAINTAINER • specify name / contact of the person maintaining the Dockerfile • Example: MAINTAINER Yannis, yannis@dotcloud.com • http://instacached.com/D3 # Memcached # # VERSION 1.0 # use the ubuntu base image provided by dotCloud FROM ubuntu MAINTAINER Yannis, yannis@dotcloud.com # make sure the package repository is up to date RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update # install memcached RUN apt-get install -y memcached
  • 9. ENTRYPOINT 1/2 • Triggers a command as soon as the container starts • Example: ENTRYPOINT echo “Whale You Be My Container?” • http://instacached.com/D4 # Whale you be my container? # # VERSION 0.42 # use the base image provided by dotCloud FROM base MAINTAINER Victor Coisne victor.coisne@dotcloud.com # say hello when the container is launched ENTRYPOINT echo "Whale you be my container"
  • 10. ENTRYPOINT 2/2 • Run containers as executables! :) • cat /etc/passwd | docker run -i wc • http://instacached.com/D5 # This is wc # # VERSION 0.42 # use the base image provided by dotCloud FROM base MAINTAINER Victor Coisne victor.coisne@dotcloud.com # count lines with wc ENTRYPOINT ["wc", "-l"]
  • 11. USER • Sets the username to use when running the image • Example: USER daemon
  • 12. EXPOSE • Sets ports to be publicly exposed when running the image • Example: EXPOSE 11211
  • 13. Memcached • http://instacached.com/Dockerfile • docker build -t memcached - < Dockerfile • docker run memcached • BOOM! :) • Try it • Python: http://instacached.com/test.py.txt • Ruby: http://instacached.com/test.rb.txt • PHP: http://instacached.com/test.php.txt
  • 14. Online Dockerfile Tutorials • Check our Dockerfile tutorials and test your skills here: http://www.docker.io/learn/dockerfile/
  • 15. Thank you • GeekDom SF • Rackspace • Docker / dotCloud • Blake Haggerty • Robert Hrdinsky • You!