cooking infrastructure with chef

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cooking infrastructure with chef ruby for scotland 2013, mathias meyer, @roidrage

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travis-ci.org

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in the beginning...

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manual steps

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useradd -h /var/www deploy

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apt-get install nginx vi /etc/nginx/nginx.conf mkdir /var/www/travis-ci.org cp ~/ssl.cert /etc/nginx/ service nginx reload

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apt-get install mysql-server vi /etc/mysql/my.cnf service mysql-server restart mkdir /var/www/travis-ci.org/shared vi /var/www/travis-ci.org/shared/database.yml

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cp /tmp/id_rsa ~/.ssh/id_rsa chmod 600 ~/.ssh/id_rsa git clone git@github.com:travis-ci/travis-ci.git

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artisanal shell scripts

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every installation howto ever

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infrastructure grows

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infrastructure changes

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teams grow and change

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automation

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chef

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chef lingo

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bork nodes attributes resources providers recipes cookbooks

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nodes

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attributes

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default[:nginx][:version] = '1.1.19-1' default[:users] = [{ id: 1001, username: 'deploy', home: '/var/www', shell: '/bin/zsh' }]

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resources

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package "nginx" do version "1.1.19-1" action :install end

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package "nginx" do version node[:nginx][:version] action :install end

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user 'deploy' do id 1001 shell '/bin/zsh' home '/var/www' end

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default[:users] = [{ id: 1001, username: 'deploy', home: '/var/www', shell: '/bin/zsh' }]

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node[:users].each do |user| user user[:login] do uid user[:id] shell user[:shell] home user[:home] end end

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it's all ruby

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providers

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directories

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directory node[:nginx][:www_root] do action :create recursive true end

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configuration files

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template "/etc/nginx/sites-available/travis-ci.org" do source "travis-ci.org.erb" owner "www-data" group "www-data" mode "0644" end

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template "/etc/nginx/sites-available/travis-ci.org" do source "travis-ci.org.erb" owner "www-data" group "www-data" mode "0644" end

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default[:nginx][:sites_available] = '/etc/nginx/sites-available' default[:nginx][:sites_enabled] = '/etc/nginx/sites-enabled' default[:nginx][:site_config] = "#{node[:nginx][:sites_available]}/" + "#{node[:nginx][:host_name]}"

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template node[:nginx][:site_config] do source "travis-ci.org.erb" owner "www-data" group "www-data" mode "0644" end

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services

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service "nginx" do supports reload: true, restart: true action :start end

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template node[:nginx][:site_config] do source "travis-ci.org.erb" owner "www-data" group "www-data" mode "0644" notifies :reload, 'service[nginx]' end

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customizing templates

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server { listen 80; server_name <%= @host_name %>; root <%= @www_root %>; location / { index index.html } }

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template "/etc/nginx/sites-available/travis-ci.org" do source "travis-ci.org.erb" notifies :reload, 'service[nginx]' variables www_root: node[:nginx][:www_root], host_name: node[:nginx][:host_name] end

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default[:nginx][:www_root] = '/var/www/travis-ci.org' default[:nginx][:host_name] = 'travis-ci.org'

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link "#{node[:nginx][:sites_enabled]}/" + node[:nginx][:host_name] do to node[:nginx][:sites_config] owner "www-data" group "www-data" end

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recipes

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package "nginx" do ... end template "/etc/nginx/sites-available/travis-ci.org" do ... end service "nginx" do ... end

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cookbooks

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simplest chef that could possibly work

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chef mantras

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order of execution

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idempodence

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chef is hard

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infrastructure is hard

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infrastructure automation

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big upfront effort

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plan to throw 1000 servers away

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quantifyable benefits?

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how is this better than shell scripts?

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common language for infrastructure automation

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mttns* mean time to new server

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mttr

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orchestration

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chef solo

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opsworks

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chef server

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chef server stores cookbooks environments nodes data roles

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roles www rails mysql-master mysql-slave

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environments staging production testing

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automate your servers

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automate your laptop

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learnchef.com

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github.com/roidrage/scotrubyconf2013