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oam/knowledge base/best practices.md
Michele Cereda dabeb5f213 chore(kb): add Goodhart's law point to the best practice
2024-04-20 01:07:35 +02:00

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OAM best practices

What really worked for me.

  1. Generic concepts
  2. Teamwork
  3. CI/CD specific
    1. Pipelining
  4. Product engineering
  5. Sources

Generic concepts

  • Always think critically and question all the things. Especially those that don't appear to make any sense.
    Don't just follow trends or advice from others. They might know better, but you will be the one dealing with the issues in the end.
  • Try to understand how something really works, may it be a technology, a tool or what else.
    Try at least once to do manually what an automation would do in your place. Look at the source code of tools. Read the fabulous documentation.
  • Stay curious. Experiment. Learn and break things (in a sane and safe way). Dive deeper into what interests you.
  • Make the informed decision that most satisfies your current necessities.
    There is no perfect nor correct solution, just different sets of tradeoff. Besides, no one will ever have all the information at the start, as some of them only come with experience and looking back at decisions one has already made gives the distorted perspective that those decisions were clearer than they really were.
  • Review every decision after some time. Check they are still relevant, or if there is some improvement you can implement.
    Things change constantly: new technologies are given birth often, and processes improve. Also, now you know better then before.
  • Keep things simple (KISS approach) with respect of your ultimate goal and not only for the sake of simplicity.
    Always going for the simple solution makes things complicated on a higher level.
    Check out KISS principle is not that simple.
  • Beware of complex things that should be simple.
    E.g., google what the SAFe delusion is.
  • Focus on what matters, but also set time aside to work on the rest.
    Check Understanding the pareto principle (the 80/20 rule).
  • Learn from your (and others') mistakes.
    Check out the 5 whys approach.
  • Put in place processes to avoid repeating mistakes.
  • Automate when and where you can, yet mind the automation paradox.
  • Automation does not necessarily involve abstracting away.
  • Keep different parts decoupled where possible, the same way interfaces are used in programming.
    This allows for quick and (as much as possible) painless switch between technologies.
  • The one-size-fits-all approach is a big fat lie.
    You'll end up with stiff, hard to change results that satisfy nobody. This proved particularly true with regards to templates and pipelines.
  • Choose tools based on how helpful they are to achieve your goals.
    Do not adapt your work to specific tools.
  • Backup your data, especially when you are about to update something.
    Murphy's law is lurking. Consider the 3-2-1 backup strategy.
  • Branch early, branch often.
  • Keep changes short and sweet.
    Nobody likes to dive deep into a 1200 lines, 356 files pull request (PR fatigue, everybody?).
  • Consider keeping changes in behaviour (logic) separated from changes to the structure.
    It allows for easier debugging by letting you deal with one great issue at a time.
  • Make changes easy, avoid making easy changes.
    Easy changes will build up long term and become a pain to deal with.
  • Trunk-based development and other branching strategies all work.
    Consider the different pros and cons of each.
  • Refactoring can be an option.
    Just don't default to it nor use it mindlessly.
  • Be aware of corporate bullshit.
  • DevOps, GitOps and other similar terms are sets of practices, suggestions, or approaches.
    They are not roles or job titles.
    They are not to be taken literally.
    They need to be adapted to the workplace, not the other way around.
  • Amazon's leadership principles are double-edge swords.
    Only Amazon was able to apply them as they are defined, and they still create a lot of discontent.
  • Keep Goodhart's law in mind:

    When a measure becomes a target, it ceases to be a good measure.

Teamwork

  • Respect what is already there, but strive to improve it.
    Current solutions are there for a reason. Learn about their ins and outs and, most of all, the why.
    Then try to make them better.
  • Don't just dismiss your teammates' customs.
    E.g., use EditorConfig instead of your editor's specific setting files only.
  • You, your teammates and other teams in your company should be on the same boat and should be shooting for the same goal.
    Act like it. You may as well collaborate instead of fighting.

CI/CD specific

  • Keep integration, delivery and deployment separated.
    They are different concepts, and as such should require different tasks.
    This also allows for checkpoints, and to fail fast with less to no unwanted consequence.

Pipelining

  • Differentiate what the concept of pipelines really is from the idea of pipelines in approaches like DevOps.
    Pipelines are sequences of actions. Pipelines in DevOps and alike end up being magic tools to take actions away from people.
  • Keep in mind the automation paradox.
    Pipelines tend to easily become complex systems just like Rube Goldberg machines.
  • Keep tasks as simple, consistent and reproducible as possible.
    Avoid like the plague to put programs or scripts in pipelines: they should be glue, not replace applications.
  • All tasks should be able to execute from one's own local machine.
    This allows to fail fast and avoid wasting time waiting for pipelines to run in a black box somewhere.
  • Consider using local automation to guarantee basic quality before the code reaches the shared repository.
    Tools like pre-commit or lefthook are a doozy for this.
  • DevOps pipelines are meant to be used as last mile steps for specific goals.
    There cannot be a single pipeline for everything, the same way as the one-size-fits-all concept never really works.

Product engineering

Consider what follows for infrastructure and platform engineering as well.

  • Focus on creating things users will want to use.
    Tools should solve issues and alleviate pain points, not create additional walls.
  • Focus on small audiences first. Avoid trying appealing lots of users from the beginning.
    If you do not have a user base, the product has no reason to exist but your will to create it.
  • Consider and fix users' pain points before adding new features.
    If users are not happy with your tool they'll try moving away from it, bringing the discussion back to the previous point in this list.
  • Avoid creating mindless abstractions, like templates using variables for all their attributes.
    Prefer providing one or at most a few simplified solutions that use different adapters or interfaces in the background instead.
    E.g., check out how Crossplane works.

Sources

Listed in order of addition: