Kubernetes K8s/Monitoring

• Actual cpu usage, not requested

  $ kubectl get --raw /apis/metrics.k8s.io/v1beta1/pods

• Events happening in cluser

  kubectl -n kube-system get events --sort-by='{.lastTimestamp}'
  
  kubectl -n kube-system get events -w
  
  kubectl get events --field-selector type=Warning -w &
  
  kubectl get pods -A -w -o wide | grep "^\|Running\|Terminating" &

• Node cpu and memory utilization

  alias util='kubectl get nodes | grep node | awk '\''{print $1}'\'' | xargs -I {} sh -c '\''echo   {} ; kubectl describe node {} | grep Allocated -A 5 | grep -ve Event -ve Allocated -ve percent -ve -- ; echo '\'''

• Watch node events (& puts it in background on terminal)

  kubectl get pods -A -o wide &

• Get cpu metrics

  # CPU for singel pod
  kubectl top pod pd-691234f8-rabcw
  
  # Get the metrics for all nodes
  kubectl get --raw /apis/metrics.k8s.io/v1beta1/nodes | jq
  
  # Get the metrics for all pods
  kubectl get --raw /apis/metrics.k8s.io/v1beta1/pods | jq
  
  # Get metrics.
  kubectl get --raw /apis/metrics.k8s.io/v1beta1/namespaces/<namespace-name>/pods/<pod-name>

# k8s cluster auto scaler

kubectl -n kube-system describe configmap cluster-autoscaler-status

Add a sniffer as a sidecart to a pod

• edit deployment and add

  - name: tcpdump
     image: corfr/tcpdump
     command:
       - /bin/sleep
       - infinity

CategoryK8sKubernetes