28th September 2021

Projects⚑

• Correction: Clean up deprecated projects.

Coding⚑

Python⚑

Python Snippets⚑

• New: Document when to use isinstance and when to use type.

  isinstance takes into account inheritance, while type doesn't. So if you want to make sure you're dealing with a specific class, and not any of it's parents or subclasses, use type(obj) == class.

DevOps⚑

Infrastructure as Code⚑

Helmfile⚑

• Correction: Improve the helmfile chart update process.

  Updating charts with helmfile is easy as long as you don't use environments, you run helmfile deps, then helmfile diff and finally helmfile apply. The tricky business comes when you want to use environments to reuse your helmfile code and don't repeat yourself. I've updated the process to include this case.

• New: Document the directory and files structure for multi-environment projects.

• New: Document how to use helmfile environments to follow DRY.

• New: Document how to avoiding code repetition.

  Besides environments, helmfile gives other useful tricks to prevent the illness of code repetition, such as using release templates, or layering the state.

• New: Document how to manage dependencies between the charts, to be able to use concurrency.

  Helmfile support concurrency with the option --concurrency=N so we can take advantage of it and improve our deployment speed, but to ensure it works as expected we have to define the dependencies among charts. For example, if an application needs a database, it has to be deployed before hand.

Operative Systems⚑

Linux⚑

Linux Snippets⚑

• New: Document how to bypass client SSL certificate with a cli tool.

  Websites that require clients to authorize with an TLS certificate are difficult to interact with through command line tools that don't support this feature.