How to manage configurations across environments

Knowing these deployment strategies is half the battle. The other half is managing the YAML that defines them, especially across multiple environments, such as development, staging, and production. Manually editing manifests for each environment is slow, error-prone, and doesn’t scale. A simple change, such as updating a container image tag or increasing a replica count, might require you to edit multiple files, risking inconsistencies that could bring down your application.

This is the configuration management problem that specialized Kubernetes tools are built to solve. They provide systematic, repeatable, and version-controlled ways to manage your application manifests.

There are two dominant tools in this space: Kustomize and Helm. We’ll start with the simpler, template-free approach that’s now built directly into kubectl: Kustomize. It allows you to define a standard “base” set of YAML...