Puppet: a (very) brief introduction

Presented to @CodeCumbria
2013-04-24

Transcript

1. Puppet: a (very) brief introduction Presented to @CodeCumbria 2013-04-24
2. http://schwuk.com @schwuk
3. Once upon a time... ...there was server. It was a good little server. It only had one application to serve, and a nice sysadmin who cared for it. He'd configured it from bare metal, had hand-crafted each config file, and installed every package by hand.
4. http://www.flickr.com/photos/bionicteaching/
5. An unhappy ending That nice sysadmin got a job at Google... ...and that one application made the front page of Hacker News. The server broke.
6. PANIC
7. An unhappy ending beginning This time they could do it right.
8. Configuration Management ...it does exactly what is says on the tin.
9. What is Puppet? Configuration Management of course! ...and much more... • Provisioning • Configuration • Automation • Deployment
10. How does work? Create a configuration Apply it to a server Rinse, repeat
11. How does it work? Standalone A local manifest is manually applied to the local server Locally :) Client/Server The client sends it's information to the server The server sends back the configuration The client applies it
12. (The official version)
13. Don't get carried away Stick to standalone mode until you've got your head around the concepts
14. Time to learn some new terms Resource Manifest
15. Resource Describes a "thing" There are many types of things... user, group, file, package, service... http://docs.puppetlabs. com/references/latest/type.html
16. Example resource user { 'dave': ensure => present, uid => '507', gid => 'admin', shell => '/bin/zsh', home => '/home/dave', managehome => true, }
17. Querying resources $ puppet resource user dave
18. Manifests Describe many "things" i.e. resources Use a .pp file extension Can be nested Can be combined
19. Example manifest # ~/example.pp file {'testfile': path => '/tmp/testfile', ensure => present, mode => 0640, content => "I'm a test file.", }
20. Applying manifests $ puppet apply example.pp
21. Applying manifests $ puppet apply example.pp notice: /Stage[main]//File[testfile]/ensure: created $ cat /tmp/testfile I'm a test file. $ ls -lah /tmp/testfile -rw-r----- 1 root root 16 Feb 23 13:15 /tmp/testfile
22. A real world example [REDACTED] (Not really, just too complex for a single slide)
23. The tip of the iceberg Go forth and experiment! http://docs.puppetlabs.com/learning/ http://docs.puppetlabs.com/
24. Questions? @schwuk