Add a Quota Without Breaking Workloads

The platform team is putting every team namespace on a budget. ratings is next. Its Deployment mailer was written without any resource requests or limits, and the team does not want to touch its manifest — the namespace should supply sensible defaults instead.

Task

• A ResourceQuota ratings-compute in ratings limits the namespace to 8 Pods, 3 CPU of requests (requests.cpu) and 2Gi of memory requests (requests.memory).
• A LimitRange ratings-defaults in ratings gives every container that does not set its own values these defaults: requests cpu: 200m, memory: 128Mi; limits cpu: 500m, memory: 256Mi.
• All 3 replicas of mailer are running, and every one of its Pods was admitted under the quota and carries the default requests and limits.
• Do not add resources to the mailer Deployment, and leave the Pod mailer-debug alone.

A practice cluster is running on this machine: start with kubectl get deploy,pods,quota,limitrange -n ratings.