Compare node allocatable vs capacity

Show reserved overhead per node; gap = kube/system reservations

kubectl get nodes -o json | jq -r '.items[] | {node:.metadata.name, capCPU:.status.capacity.cpu, allocCPU:.status.allocatable.cpu, capMem:.status.capacity.memory, allocMem:.status.allocatable.memory}'
tool
kubectl73 commands
tags
kubectlperformancemonitoringk8s

More kubectl commands

  • ConfigMap from env-file with patch op
    kubectl create configmap <name> --from-env-file=app.env -n <ns> --dry-run=client -o yaml | kubectl apply -f -; kubectl patch deploy/<name> -n <ns> --type=json -p='[{"op":"add","path":"/spec/template/spec/containers/0/envFrom/-","value":{"configMapRef":{"name":"<name>"}}}]'

    Build a CM from KEY=VALUE file, then JSON-patch it into a container's envFrom

  • List all pods across namespaces
    kubectl get pods -A -o wide

    All pods with node placement and IPs

  • Describe a pod
    kubectl describe pod <name> -n <ns>

    Full details: events, conditions, volume mounts

  • Follow pod logs
    kubectl logs -f <pod> -n <ns>

    Stream logs in real time; add -c <container> for multi-container pods

  • Logs from previous container
    kubectl logs <pod> --previous -n <ns>

    Logs from the last crashed/restarted container instance

all 73 kubectl commands