Real World Deployment using Chef

by Noah Kantrowitz

  • Ops Code guy
  • Really good at Python!
  • Django hacker
  • Ruby user (tolerates it and not enthusiastic about ti)
  • Developer

Who is here

  • Sys admins
  • Designers
  • Developers
  • Designers

How and why

  • Infrastructure as good

  • Rebuild a system via a script that includes servers and database

    • Configuration management

    • System integration

      • Don’t use wikis
      • don’t use spreadsheets
      • use code!

How does thus work?

  • Provision

    • Servers
    • Load balancers
    • etcs

  • Configure

    • Servers
    • Load balancers
    • etcs

About chef

  • Reasonability
  • flexibility
  • libraties and primitives

Bits

  • ohai
  • chef-client
  • chef-server
  • knife (command line utility)

..note:: mixed a section here

ecosysye,

  • Apache license 2
  • 400 contrib
  • open source code
  • On github

Infrastructure

  • Recipe

    • Have a type
    • have a name
    • have parameters
    • take actions to change state
    • can send notifications to other resources

  • Resources

    • resources take action through providers
    • What operating system you are on will determine what action is run

common resources

  • package ‘apache2
  • template “/etc/apache2/httpd.conf”
  • cookbook_file (Load a recipe that does this sort of thing)

Idempotence

Note

what does that word mean anyhow? Ha ha

  • Convergence
  • Gaurd clauses

Chef Recipes

  • Runs just like a script. Doesn;t that make them… scripts?
  • Recipes can include other recipes
  • Extend recipes with Ruby
  • Dynamic configuration through search - so you can search your servers for stuff

Chef Roles

  • Things can be assigned server roles
  • Roles describe nodes
  • Roles have a run list
  • Roles can have attributes

Other chef terms

  • Cookbooks are collections recipes
  • JSON blobs
  • Other thing 1
  • Other thing 2

Python cookbook

  • You can use pip and virtualenv! Yeah!
  • gunicorn::default
  • supervisor::default
  • Debian-style fot now
  • servicer service

Case Studies - Packaginator

  • Inatll users
  • configure sudo
  • apt-get update
  • install gcc

Warning

Some of the Chef stuff Noah goes over isn’t public yet. Probably in a few days

notes

  • Always run the migrations!
  • Apparently we have our reqs in a weird place. I kind of agree
  • Old-style custom collectstatic. Need to finish the 1.3 integration!
  • https://github.com/coderanger/djangocon2011
  • Mentions the issues with settings that Jacob Kaplan-Moss taught me.