我是 Kubernetes 世界的新手。按照 InstallKubernetes 的步骤，我安装了具有 1 个主节点和 2 个工作节点的 Kubernetes 集群。我使用 kubeadm 在本地机器上的主节点上进行安装。安装 CILIUMQuickInstallation 后，我的 coredns pod 正在运行但尚未准备好
[root@master-node ~]# kubectl describe pod coredns-64897985d-cfpvn -n kube-system
Name: coredns-64897985d-cfpvn
Namespace: kube-system
Priority: 2000000000
Priority Class Name: system-cluster-critical
Node: node-2/10.193.160.170
Start Time: Tue, 15 Feb 2022 08:12:33 -0500
Labels: k8s-app=kube-dns
pod-template-hash=64897985d
Annotations: <none>
Status: Running
IP: 10.0.1.95
IPs:
IP: 10.0.1.95
Controlled By: ReplicaSet/coredns-64897985d
Containers:
coredns:
Container ID: docker://2283b42b559c95513f3bfd8c90491b3c8acc55b5542a88d22d2fceaa8c347f9a
Image: k8s.gcr.io/coredns/coredns:v1.8.6
Image ID: docker-pullable://k8s.gcr.io/coredns/coredns@sha256:5b6ec0d6de9baaf3e92d0f66cd96a25b9edbce8716f5f15dcd1a616b3abd590e
Ports: 53/UDP, 53/TCP, 9153/TCP
Host Ports: 0/UDP, 0/TCP, 0/TCP
Args:
-conf
/etc/coredns/Corefile
State: Running
Started: Tue, 15 Feb 2022 08:12:35 -0500
Ready: False
Restart Count: 0
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 kube-api-access-b64rl (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
kube-api-access-b64rl:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: Burstable
Node-Selectors: kubernetes.io/os=linux
Tolerations: CriticalAddonsOnly op=Exists
node-role.kubernetes.io/control-plane:NoSchedule
node-role.kubernetes.io/master:NoSchedule
node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 2m1s default-scheduler Successfully assigned kube-system/coredns-64897985d-cfpvn to node-2
Normal Pulled 119s kubelet Container image "k8s.gcr.io/coredns/coredns:v1.8.6" already present on machine
Normal Created 119s kubelet Created container coredns
Normal Started 119s kubelet Started container coredns
Warning Unhealthy 1s (x15 over 119s) kubelet Readiness probe failed: HTTP probe failed with statuscode: 503
POD 的日志
[INFO] plugin/ready: Still waiting on: "kubernetes"
[ERROR] plugin/errors: 2 62173616170875592.2350229940780337967. HINFO: read udp 10.0.1.95:45853->10.192.0.250:53: read: no route to host
[ERROR] plugin/errors: 2 62173616170875592.2350229940780337967. HINFO: read udp 10.0.1.95:44728->10.192.0.250:53: i/o timeout
[ERROR] plugin/errors: 2 62173616170875592.2350229940780337967. HINFO: read udp 10.0.1.95:45554->10.193.0.250:53: i/o timeout
[ERROR] plugin/errors: 2 62173616170875592.2350229940780337967. HINFO: read udp 10.0.1.95:57310->10.193.0.250:53: i/o timeout
[INFO] plugin/ready: Still waiting on: "kubernetes"
[ERROR] plugin/errors: 2 62173616170875592.2350229940780337967. HINFO: read udp 10.0.1.95:47540->10.193.0.250:53: i/o timeout
[INFO] plugin/ready: Still waiting on: "kubernetes"