Types, speed and migration

An introduction to Puppet 4 and how to upgrade given at Puppet Camp Amsterdam 2016.

Transcript

1. Types, speed and migration An introduction to Puppet 4 and how to upgrade.
2. I am that guy ‣Daenney ‣Puppet for ~5 years ‣puppetlabs/apt ‣pypuppetdb & Puppetboard ‣“You broke the tests” ‣Vox Pupuli
3. Vox Pupuli 60 Modules & tooling 50 Puppeteers Join the revolution!
4. Types
5. Puppet 0.24 - 3.8 It’s whatever I feel like.
6. notice(md5("240610708") == md5("QNKCDZO")) md5('QNKCDZO'): 0e830400451993494058024219903391 md5('240610708'): 0e462097431906509019562988736854
7. Puppet 4 It’s exactly what it is supposed to be.
8. Untyped class parameters Are of type "Any"
9. class a ( $maven_version = [] ) { notice($maven_version) } class { 'a': maven_version => '1.0.3', } Notice: Scope(Class[A]): 1.0.3
10. Typed class parameters
11. class a ( Array $maven_version = [] ) { notice($maven_version) } class { 'a': maven_version => '1.0.3', } Error: Expected parameter 'maven_version' of 'Class[A]' to have type Array[Data], got String.
12. Variables Are typed to their value
13. class a { $var = {} case $var { Hash: { notice('a hash')} default: { notice('not a hash')} } } Notice: Scope(Class[A]): a hash
14. $array_of_things.each | Integer $index, Variant[String, Hash] $value | { … }
15. case $magic_thingy { Undef: { $_magic_thingy = [] } Array: { $_magic_thingy = $_magic_thingy } Hash: { $_magic_thingy = [$_magic_thingy] } String: { $_magic_thingy = [$_magic_thingy] } default: { fail('magic_thingy can only be: String, Array, Hash or unset') } }
16. Complex Types
17. Struct[{ policy => Enum[changed, always, daily, weekly], timeout => Optional[Integer], ]} $update = { 'policy' => 'changed' }
18. Splat
19. $p_opts = { 'ensure' => 'latest', } package { 'fish': * => $p_opts, require => Apt::Source['fish'], }
20. Docs https://docs.puppetlabs.com/puppet/ 4.3/reference/lang_data.html
21. Speed Comes in two forms
22. Development speed Early, accurate feedback.
23. Compilation speed 15 - 40% faster since 4.2.0
24. Staying compatible with 3 and 4 is frustrating.
25. This is how we did it. With >10k nodes.
26. Step 1: breathe
27. Step 2: get to 3.8
28. Step 2.5: upgrade modules Vox Pupuli and Puppetlabs modules Just Work™
29. Step 3: future parser Do not enable this on Puppet < 3.7.4
30. http://entroz.deviantart.com/art/You-Shall-Not-Pass-330127651
31. Step 4: upgrade to 4
32. Step 5: …
33. https://flic.kr/p/7h9HWP
34. Spin up a new master Point agents to the new master and babysit them.
35. Pre-compile and compare catalogs Catalog Preview: http://is.gd/mod_catalog_preview Puppet Catalog differ: http://is.gd/catalog_diff Puppet Catalog diff viewer: http://is.gd/catalog_diff_viewer
36. We did it in… 1 — 2 weeks of prep 1 week of rollout 2 — 3 days of cleanup 0 production incidents
37. But… we cheated Migrated to future parser over a year go :-).
38. Q? Maybe A.