~$ kubectl describe po -n kube-system coredns-5644d7b6d9-dxkrn
Name:                 coredns-5644d7b6d9-dxkrn
Namespace:            kube-system
Priority:             2000000000
Priority Class Name:  system-cluster-critical
Node:                 k8s-nsx-02/172.16.10.212
Start Time:           Sun, 26 Jan 2020 15:49:21 +0000
Labels:               k8s-app=kube-dns
                      pod-template-hash=5644d7b6d9
Annotations:          <none>
Status:               Running
IP:                   172.16.1.3
IPs:
  IP:           172.16.1.3
Controlled By:  ReplicaSet/coredns-5644d7b6d9
Containers:
  coredns:
    Container ID:  docker://534f1baaad5f9e7f82eefab76063770c10f0bc145455fa050ab9f8c498c89aef
    Image:         k8s.gcr.io/coredns:1.6.2
    Image ID:      docker-pullable://k8s.gcr.io/coredns@sha256:12eb885b8685b1b13a04ecf5c23bc809c2e57917252fd7b0be9e9c00644e8ee5
    Ports:         53/UDP, 53/TCP, 9153/TCP
    Host Ports:    0/UDP, 0/TCP, 0/TCP
    Args:
      -conf
      /etc/coredns/Corefile
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Completed
      Exit Code:    0
      Started:      Sun, 26 Jan 2020 16:05:33 +0000
      Finished:     Sun, 26 Jan 2020 16:07:23 +0000
    Ready:          False
    Restart Count:  9
    Limits:
      memory:  170Mi
    Requests:
      cpu:        100m
      memory:     70Mi
    Liveness:     http-get http://:8080/health delay=60s timeout=5s period=10s #success=1 #failure=5
    Readiness:    http-get http://:8181/ready delay=0s timeout=1s period=10s #success=1 #failure=3
    Environment:  <none>
    Mounts:
      /etc/coredns from config-volume (ro)
      /var/run/secrets/kubernetes.io/serviceaccount from coredns-token-bz7j9 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  config-volume:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      coredns
    Optional:  false
  coredns-token-bz7j9:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  coredns-token-bz7j9
    Optional:    false
QoS Class:       Burstable
Node-Selectors:  beta.kubernetes.io/os=linux
Tolerations:     CriticalAddonsOnly
                 node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason            Age                    From                 Message
  ----     ------            ----                   ----                 -------
  Warning  FailedScheduling  37m (x3 over 38m)      default-scheduler    0/1 nodes are available: 1 node(s) had taints that the pod didn't tolerate.
  Warning  FailedScheduling  22m (x13 over 36m)     default-scheduler    0/2 nodes are available: 2 node(s) had taints that the pod didn't tolerate.
  Normal   Scheduled         22m                    default-scheduler    Successfully assigned kube-system/coredns-5644d7b6d9-dxkrn to k8s-nsx-02
  Normal   Pulling           22m                    kubelet, k8s-nsx-02  Pulling image "k8s.gcr.io/coredns:1.6.2"
  Normal   Pulled            22m                    kubelet, k8s-nsx-02  Successfully pulled image "k8s.gcr.io/coredns:1.6.2"
  Normal   Created           22m (x4 over 22m)      kubelet, k8s-nsx-02  Created container coredns
  Normal   Pulled            22m (x3 over 22m)      kubelet, k8s-nsx-02  Container image "k8s.gcr.io/coredns:1.6.2" already present on machine
  Normal   Started           22m (x4 over 22m)      kubelet, k8s-nsx-02  Started container coredns
  Normal   Killing           22m (x4 over 22m)      kubelet, k8s-nsx-02  Stopping container coredns
  Warning  Unhealthy         22m (x2 over 22m)      kubelet, k8s-nsx-02  Readiness probe failed: Get http://:8181/ready: dial tcp :8181: connect: connection refused
  Normal   SandboxChanged    17m (x96 over 22m)     kubelet, k8s-nsx-02  Pod sandbox changed, it will be killed and re-created.
  Warning  Unhealthy         7m51s (x4 over 8m21s)  kubelet, k8s-nsx-02  Readiness probe failed: Get http://172.16.1.3:8181/ready: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  Warning  BackOff           2m52s (x209 over 22m)  kubelet, k8s-nsx-02  Back-off restarting failed container