Provisioning & Deploying with Docker
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This document discusses using Chef configuration management with Docker containers. It describes using Chef at both the build stage and runtime stage of containers. At build time, Chef can configure and install applications into an image. At runtime, Chef can further configure running containers based on environment variables. Combining Chef and Docker provides immutable infrastructure, faster deployments, and testable configurations.
![It’s a shell-script?
$ cat SomeApp/Dockerfile
FROM ubuntu:13.10
RUN apt-get update; apt-get install apache
RUN sed ’s/something/else/‘ /etc/apache/httpd.conf
ADD shell-script.sh
RUN shell-script.sh
RUN [‘/usr/bin/apachectl’, ‘start’]](https://image.slidesharecdn.com/deployingdocker-140514071002-phpapp02/85/Provisioning-Deploying-with-Docker-10-320.jpg)
Provisioning & Deploying with Docker
- 2. @ewindisch
- 3. Deploying with Docker Atlanta Docker Meetup 2014.05.13
- 4. Do I still need Chef <or insert tool here>?
- 5. There is no easy answer
- 8. Why do we still need <or insert tool here>?
- 10. It’s a shell-script? $ cat SomeApp/Dockerfile FROM ubuntu:13.10 RUN apt-get update; apt-get install apache RUN sed ’s/something/else/‘ /etc/apache/httpd.conf ADD shell-script.sh RUN shell-script.sh RUN [‘/usr/bin/apachectl’, ‘start’]
- 11. How do we do it? $ cat Dockerfile FROM fedora RUN yum update yum -y install chef
- 14. Images on HW is usually mutable Hardware Image Linux Chef Installs Chef Image' Linux Chef Creates Replaces Runs
- 16. Ephemeral environments are (somewhat) immutable. Hypervisor Image Linux Chef Runs Image' Linux Chef Chef Runs Configures VM Accesses COW
- 18. Containers are like ephemeral VMs* * Docker containers don’t HAVE to be ephemeral, but it’s TheRightThing Docker Image Linux Chef Runs Image' Linux Chef Chef Runs Configures Container Accesses COW TM
- 19. Runtime Configuration • One image, several configurations • Configuration based on container environment • Specify metadata or roles via environment variables (passed to ‘docker run -e’)
- 20. Chef-for-runtime $ cat Dockerfile FROM fedora RUN yum update yum -y install chef ADD http://x/receipes.tar.gz /opt/chef" ADD solo.rb /etc/chef/solo.rb" CMD chef-solo -c /etc/chef/solo.rb ; ! apachectl start
- 21. Does it converge? $ docker build —rm . $ echo $? # pass or fail (This is great use of Docker as an alternative to VMs for testing Chef recipes targeting non-Docker production systems)
- 22. Bootstrapping Configuration Management on every boot is expensive
- 23. Let us use images!
- 24. Build-time configuration • Speed up Chef-based deployments (do it once!) • Eliminate run-time network requirements • Config-management CI
- 25. Chef-for-build $ cat Dockerfile FROM fedora RUN yum update yum -y install chef" ADD http://x/receipes.tar.gz /opt/chef" ADD solo.rb /etc/chef/solo.rb" RUN chef-solo -c /etc/chef/solo.rb
- 26. Burning configuration into images. Docker ContainerInitiates Creates Image Linux Chef Chef Runs Configures Build Creates
- 27. Expanded view: Burning configuration into images. Docker Image tagInitiates Image' Linux Chef Chef Build Image Linux Chef Creates Creates Runs Creates References 1 2
- 28. Anatomy of a Docker+Chef build & run Docker ContainerInitiates Creates Image Linux Chef Chef Runs Configures Chef Runs Configures Build Creates Stage 1 Stage 2
- 29. Chef-for-all-the-things $ cat Dockerfile FROM fedora RUN yum update yum -y install chef ADD http://x/receipes.tar.gz /opt/chef" ADD solo-stage1.rb /etc/chef/solo-stage1.rb" ADD solo-stage2.rb /etc/chef/solo-stage2.rb" RUN chef-solo -c /etc/chef/solo-stage1.rb" CMD chef-solo -c /etc/chef/solo-stage2.rb ;" apachectl start