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cooking infrastructure with chef
Mathias Meyer
May 13, 2013
Technology
4
210
cooking infrastructure with chef
An introduction to Chef with the simplest Chef that could possibly work.
Mathias Meyer
May 13, 2013
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Transcript
cooking infrastructure with chef ruby for scotland 2013, mathias meyer,
@roidrage
travis-ci.org
None
in the beginning...
manual steps
useradd -h /var/www deploy
apt-get install nginx vi /etc/nginx/nginx.conf mkdir /var/www/travis-ci.org cp ~/ssl.cert /etc/nginx/
service nginx reload
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
cp /tmp/id_rsa ~/.ssh/id_rsa chmod 600 ~/.ssh/id_rsa git clone git@github.com:travis-ci/travis-ci.git
artisanal shell scripts
every installation howto ever
None
infrastructure grows
infrastructure changes
teams grow and change
automation
chef
None
chef lingo
bork nodes attributes resources providers recipes cookbooks
nodes
attributes
default[:nginx][:version] = '1.1.19-1' default[:users] = [{ id: 1001, username: 'deploy',
home: '/var/www', shell: '/bin/zsh' }]
resources
package "nginx" do version "1.1.19-1" action :install end
package "nginx" do version node[:nginx][:version] action :install end
user 'deploy' do id 1001 shell '/bin/zsh' home '/var/www' end
default[:users] = [{ id: 1001, username: 'deploy', home: '/var/www', shell:
'/bin/zsh' }]
node[:users].each do |user| user user[:login] do uid user[:id] shell user[:shell]
home user[:home] end end
it's all ruby
providers
directories
directory node[:nginx][:www_root] do action :create recursive true end
configuration files
template "/etc/nginx/sites-available/travis-ci.org" do source "travis-ci.org.erb" owner "www-data" group "www-data" mode
"0644" end
template "/etc/nginx/sites-available/travis-ci.org" do source "travis-ci.org.erb" owner "www-data" group "www-data" mode
"0644" end
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]}"
template node[:nginx][:site_config] do source "travis-ci.org.erb" owner "www-data" group "www-data" mode
"0644" end
services
service "nginx" do supports reload: true, restart: true action :start
end
template node[:nginx][:site_config] do source "travis-ci.org.erb" owner "www-data" group "www-data" mode
"0644" notifies :reload, 'service[nginx]' end
customizing templates
server { listen 80; server_name <%= @host_name %>; root <%=
@www_root %>; location / { index index.html } }
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
default[:nginx][:www_root] = '/var/www/travis-ci.org' default[:nginx][:host_name] = 'travis-ci.org'
link "#{node[:nginx][:sites_enabled]}/" + node[:nginx][:host_name] do to node[:nginx][:sites_config] owner "www-data" group
"www-data" end
recipes
package "nginx" do ... end template "/etc/nginx/sites-available/travis-ci.org" do ... end
service "nginx" do ... end
cookbooks
None
simplest chef that could possibly work
chef mantras
order of execution
idempodence
chef is hard
infrastructure is hard
infrastructure automation
big upfront effort
plan to throw 1000 servers away
quantifyable benefits?
how is this better than shell scripts?
common language for infrastructure automation
mttns* mean time to new server
mttr
orchestration
chef solo
opsworks
chef server
chef server stores cookbooks environments nodes data roles
roles www rails mysql-master mysql-slave
environments staging production testing
automate your servers
automate your laptop
learnchef.com
None
github.com/roidrage/scotrubyconf2013