详细过程不赘述了。百度了很多办法都不可用，然后尝试重装k8s 好多次也不管用。
最后解决。
kubectl edit deployment coredns -n kube-system
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "2"
creationTimestamp: "2023-08-14T06:04:16Z"
generation: 2
labels:
k8s-app: kube-dns
name: coredns
namespace: kube-system
resourceVersion: "1505"
uid: 18c027ac-0745-4418-afe5-522ee1e1f369
spec:
progressDeadlineSeconds: 600
replicas: 2
revisionHistoryLimit: 10
selector:
matchLabels:
k8s-app: kube-dns
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 1
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
k8s-app: kube-dns
spec:
containers:
- args:
- -conf
- /etc/coredns/Corefile
command:
- /bin/bash
- -ce
- tail -f /dev/null
image: registry.aliyuncs.com/google_containers/coredns/coredns:v1.8.0
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 5
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 5
name: coredns
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /ready
port: 8181
scheme: HTTP
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /etc/coredns
name: config-volume
readOnly: true
dnsPolicy: Default
nodeSelector:
kubernetes.io/os: linux
priorityClassName: system-cluster-critical
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
serviceAccount: coredns
serviceAccountName: coredns
terminationGracePeriodSeconds: 30
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- effect: NoSchedule
key: node-role.kubernetes.io/master
- effect: NoSchedule
key: node-role.kubernetes.io/control-plane
volumes:
- configMap:
defaultMode: 420
items:
- key: Corefile
path: Corefile
name: coredns
name: config-volume
status:
conditions:
- lastTransitionTime: "2023-08-14T06:04:33Z"
lastUpdateTime: "2023-08-14T06:04:33Z"
message: Deployment does not have minimum availability.
reason: MinimumReplicasUnavailable
status: "False"
type: Available
- lastTransitionTime: "2023-08-14T06:15:18Z"
lastUpdateTime: "2023-08-14T06:15:19Z"
message: ReplicaSet "coredns-57d966b595" is progressing.
reason: ReplicaSetUpdated
status: "True"
type: Progressing
observedGeneration: 2
replicas: 3
unavailableReplicas: 3
updatedReplicas: 2