Kubernetes
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Why this exists Three copies of a Deployment YAML, one per environment, with a few lines different in each, is how manifest drift starts: someone fixes a probe in staging and forgets production, and eighteen months…
Kustomize Bases and Overlays: One Manifest Set, Three Environments
A base Deployment/Service/ConfigMap plus dev, staging and production overlays that each change the replica count, environment variables and a resource limit, applied for real to three namespaces with the resulting Pods proven to differ, plus kubectl diff used to preview a change before applying it.
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