Puppet Camp Germany 2020 - Puppet Control Repo and GIT

May 5, 20202 likes1,509 views

Three different examples on GIT workflows for Puppet Control Repository. Starting from single branch to multiple long living branches.

Puppet Control Repository and
GIT
Martin Alfke - example42 GmbH

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 2
Puppet Trainer since 2011
CEO & Co-Founder example42 GmbH
tuxmea (Twitter, GitHub, Slack)
About me

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 3
Puppet Control-Repo
Simple GIT workflow
GIT workflow with staging branch
GIT Flow
Topics covered:

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Puppet Control Repo
4
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Puppet Control Repo
5
One repository for your own code
Separation of upstream modules
(Puppetfile or git submodules)
Branches will become Puppet
environments
Either empty repo or example42 Puppet
System Infrastructure Construction Kit
(PSICK on GitHub).
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Puppet Control Repo
6
Image: tatlin
App-DEV development testing production

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Puppet Control Repo
7
Image: tatlin
App-DEV development testing production
Puppet DEV production

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Puppet Control Repo
8
Image: tatlin
App-DEV development testing production
Puppet DEV production production production
Application Stages
Puppet Environments

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Simple GIT workflow
9
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Simple GIT workflow
10
One long living protected branch
(production)
Differences between stages are in
Hiera.
Activating features using feature flags.
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Simple GIT workflow
11
All changes come via feature branches
Prevent special chars like +, -, %, ...
these environments will not get
deployed.
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 12
Simple GIT workflow

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Simple GIT workflow
13
Pro:
Easy to learn, easy to handle
Con:
No real staging of code, code changes
affect all stages (when activated)
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT workflow with staging branch
14
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT workflow with staging branch
15
Network separation between
development and production?
Separate GIT servers and Puppet
Masters?
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT workflow with staging branch
16
All code must be developed in
development zone
No code may be added in
production, except via merge
requests.
CI/CD Systems synchronizes code
base using a staging branch
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 17
GIT workflow with staging branch

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT workflow with staging branch
18
Pro:
Security separation is taken care on
Con:
Needs automatic merging and staging,
no manual merges.
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
19
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
20
Image: tatlin
ITIL processes?
Strict code separation between
development and production required?
Hot fixes and Features must be
possible?

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
21
Image: tatlin
No merges between branches!
Each branch is an individual
development.
Cherry-Pick into next stage.

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 22
GIT Flow

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 23
GIT Flow

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
24
Image: tatlin
Each feature branch may consist of a
single commit only.
Use git commit --amend or git squash

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
25

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
26
Image: tatlin
GIT Flow
Requires knowledge on
- squashing
- rebasing
- solving merge conflicts

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH 27
GIT Flow

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
GIT Flow
28
Image: tatlin
Pro:
Branch specific development possible
Con:
needs deeper understanding on GIT
more work to bring changes into
desired branch

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Summary
29
Simple can be harder than complex:
You have to work hard to get your
thinking clean to make it simple.
But it's worth it in the end because
once you get there, you can move
mountains.
- Steve Jobs

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Conclusion
30
Image: tatlin

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Conclusion
31
Start simple and expand when learning. - K.I.S.S.
Automate everything, also your code deployment!
GIT has a learning curve. Take care on that! Learn GIT!
Never adopt complex workflows if you don’t need them!
“If you use all your smartness to write the code, you have none left to debug
it.” (David Schmidt)

Puppet Control Repository and GIT - PuppetCamp Europe 2020 - Martin Alfke © example42 GmbH
Conclusion 2
32
Stop social distancing! We need physical distance!
Take care on people who need help!

This document discusses testing Puppet code when using modules versus a control repository. It recommends starting with simple syntax and unit tests using PDK or rspec-puppet for modules, and using OnceOver for testing control repositories, as it is specially designed for this purpose. OnceOver allows defining classes, nodes, and a test matrix to run syntax, unit, and acceptance tests across different configurations. Moving from simple to more complex testing approaches like acceptance tests is suggested. PDK and OnceOver both have limitations for testing across operating systems that may require customizing spec tests. Infrastructure for running acceptance tests in VMs or containers is also discussed.

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