Squashing the Heisenbugs
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Squashing the Heisenbugs (really Bohrbugs) is a talk that I gave at the Chariot CI Event on December 1st, 2010. Feel free to ask me any questions about it via email or twitter. Also, please hire us if you're looking for any devops help.
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Squashing the Heisenbugs
- 1. SQUASHINGTHE HEISENBUGS Trotter Cashion / Chariot CI Event 2010 http://www.flickr.com/photos/gliuoo/2539512435/sizes/z/in/photostream/
- 2. SQUASHINGTHE HEISENBUGS Trotter Cashion / Chariot CI Event 2010 http://www.flickr.com/photos/gliuoo/2539512435/sizes/z/in/photostream/ BOHRBUGS
- 3. SQUASHINGTHE BOHRBUGS Trotter Cashion / Chariot CI Event 2010 http://www.flickr.com/photos/gliuoo/2539512435/sizes/z/in/photostream/
- 4. THIS WILL BE ON THE INTERNET!
- 8. AGENDA
- 11. CHEF
- 12. TYING CHEF INTO CI
- 17. MANDELBUGS
- 18. SCHRÖDINBUGS
- 19. NOOBBUGS
- 26. Memcached
- 27. Memcached Redis
- 38. Memcached Redis Mongodb Riak Cassandra ProjectVoldemort Ubuntu Redhat Solaris iptables sshd DNS Servers TCP/IP internals
- 39. We Idolize the Artisan Sysadmin
- 40. ... but what do we end up with?
- 41. http://www.enviro-bc.ca/wp-content/uploads/2009/04/bowlake-aval_clair-israelson.jpg SNOWFLAKES ... that become avalanches
- 44. We’re really left with two choices
- 46. Automation is not hard!
- 47. BASH
- 55. HOW IT WORKS
- 57. HOW IT WORKS Your Computer Box to Provision
- 58. HOW IT WORKS Your Computer Chef Server Box to Provision
- 59. HOW IT WORKS Your Computer Chef Server Box to Provision Prepare
- 60. HOW IT WORKS Your Computer Chef Server Box to Provision Prepare What now?
- 61. HOW IT WORKS Your Computer Chef Server Box to Provision Prepare What now? Cookbooks
- 62. HOW IT WORKS Your Computer Chef Server Box to Provision Prepare What now? Cookbooks Run!
- 64. HOW IT WORKS
- 66. HOW IT WORKS Your Computer Box to Provision
- 67. HOW IT WORKS Your Computer Box to Provision Prepare
- 68. HOW IT WORKS Your Computer Box to Provision Cookbooks Prepare
- 69. HOW IT WORKS Your Computer Box to Provision Cookbooks Prepare Go!
- 70. Chef Structure
- 71. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 72. ROLES ARE REUSABLE! config/dev.json config/db.json roles/db.rb
- 74. WHAT YOU NEED
- 75. WHAT YOU NEED Ruby & Rubygems
- 76. WHAT YOU NEED Ruby & Rubygems `gem install chef` Chef Gem
- 77. WHAT YOU NEED Ruby & Rubygems `gem install chef` Chef Gem `git clone http://github.com/ opscode/chef-repo.git` Chef Repo
- 79. TERMINAL JUNKIES
- 80. TERMINAL JUNKIES •spatula search mysql
- 81. TERMINAL JUNKIES •spatula search mysql •spatula install mysql
- 82. TERMINAL JUNKIES •spatula search mysql •spatula install mysql •spatula show mysql
- 83. TERMINAL JUNKIES •spatula search mysql •spatula install mysql •spatula show mysql •... knife has similar functionality
- 84. GET THE BOX READY spatula prepare db-one.host ssh db-one.host “install ruby” ssh db-one.host “install chef” =
- 85. GO GO GO! spatula cook db-one.host db ssh db-one.host “sudo chef-solo -c config/solo.rb -j config/db.json” rsync repo to db-one.host =
- 86. WITH CHEF SERVER install dependencies turn on client send cookbooks to client
- 88. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 89. // ./config/db_one.json { "run_list": ["role[db]"] } A NODE Recipes and Roles go here
- 90. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 91. # ./roles/db.rb name "database" description "Be a DB" run_list [ "apache2", "mysql::server" ] A ROLE
- 92. # ./roles/db.rb name "database" description "Be a DB" run_list [ "apache2", "mysql::server" ] A ROLE Recipes to run
- 93. # ./roles/db.rb name "database" description "Be a DB" run_list [ "apache2", "mysql::server" ] A ROLE ./cookbooks/apache2/recipes/default.rb
- 94. # ./roles/db.rb name "database" description "Be a DB" run_list [ "apache2", "mysql::server" ] A ROLE ./cookbooks/mysql/recipes/server.rb
- 95. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 96. # ./cookbooks/mysql/attributes/server.rb default[:mysql][:server_debian_password] = secure_password default[:mysql][:server_root_password] = secure_password default[:mysql][:server_repl_password] = secure_password default[:mysql][:bind_address] = ipaddress default[:mysql][:datadir] = "/var/lib/mysql" # Tunables default[:mysql][:tunable][:key_buffer] = "250M" default[:mysql][:tunable][:max_connections] = "800" default[:mysql][:tunable][:wait_timeout] = "180" ATTRIBUTES
- 97. // ./config/db.json { "mysql": { "server_root_password": "beefcake" }, "recipes": [ "mysql" ] } OVERRIDING ATTRIBUTES # ./roles/db.rb name "database" description "Be a DB" run_list [ "mysql::server" ] default_attributes :mysql => { :server_root_password => "beefcake" } Node Role
- 98. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 99. # ./cookbooks/mysql/recipes/server.rb include_recipe "mysql::client" THE RECIPE... PART 1
- 100. package "mysql-server" do action :install end THE RECIPE... PART 2
- 101. template "/etc/mysql/my.cnf" do source "my.cnf.erb" owner "root" group "root" mode "0644" notifies :restart, resources(:service => "mysql"), :immediately end THE RECIPE... PART 3
- 102. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 103. user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = <%= @datadir %> bind-address = <%= @node[:mysql][:bind_address] %> A TEMPLATE SAMPLE
- 104. user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = <%= @datadir %> bind-address = <%= @node[:mysql][:bind_address] %> A TEMPLATE SAMPLE OMG, ERB!!
- 105. user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = <%= @datadir %> bind-address = <%= @node[:mysql][:bind_address] %> A TEMPLATE SAMPLE From Attributes
- 106. user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = <%= @datadir %> bind-address = <%= @node[:mysql][:bind_address] %> A TEMPLATE SAMPLE FromTemplate
- 107. template "/etc/mysql/my.cnf" do source "my.cnf.erb" owner "root" group "root" mode "0644" variables :datadir => “/var/lib/mysql” end ASSIGNING VARIABLES
- 108. CHEF HEIRARCHY Node Roles Cookbooks Cookbooks Recipes Attributes Templates Definitions
- 109. define :apache_conf do dir = node[:apache][:dir] template "#{dir}/mods-available/#{params[:name]}.conf" do source "mods/#{params[:name]}.conf.erb" notifies :restart, resources(:service => "apache2") end end # In your recipe apache_conf "mod_ssl" DEFINITIONS
- 110. TYING IT INTO CI
- 111. USE CHEFTO PROVISION CI http://images.nationalgeographic.com/wpf/media-live/photos/000/148/custom/heart-ngk0207_14824_470x300.jpg
- 112. attribution CHEF AS PART OF TEST SCRIPT
- 118. ONTHE INTERNETS
- 119. ONTHE INTERNETS •twitter - @cashion
- 120. ONTHE INTERNETS •twitter - @cashion •github - http://github.com/trotter
- 121. ONTHE INTERNETS •twitter - @cashion •github - http://github.com/trotter •email - cashion on the gmailz
- 123. RESOURCES