Describing what you want.
WHAT A MANIFEST IS
A file describing an object.
WHAT EVERY ONE CONTAINS
The version of the interface The kind of object Metadata, including a name The specification
WHAT LABELS ARE FOR
Identifying and grouping objects.
WHY THEY MATTER MORE THAN THEY APPEAR
Services select pods by label, and a mismatch means no traffic reaches anything.
WHAT THE COMMONEST BEGINNER FAULT IS
Labels on the pod not matching the service's selector.
WHAT TO CHECK WHEN NOTHING WORKS
Whether the service has any endpoints.
WHAT A DEPLOYMENT SPECIFICATION CONTAINS
The number of replicas The label selector The pod template
WHAT THE POD TEMPLATE CONTAINS
Containers, with images, ports, environment, resources and probes.
WHAT TO ALWAYS SET
Resource requests and limits Liveness and readiness probes
WHY REQUESTS MATTER
They determine where pods are placed.
WHY LIMITS MATTER
They prevent one pod affecting others.
WHAT TO KEEP IN VERSION CONTROL
Every manifest.
WHAT TO AVOID
Changing objects directly in the cluster.
WHY
The change exists nowhere else, and is lost on the next apply.
WHAT TO USE FOR ENVIRONMENT DIFFERENCES
Overlays or templating, rather than copies.
