1、查看集群状态
[root@node-3 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready <none> 14h v1.21.3
node-3 Ready control-plane,master 14h v1.21.3
查看master状态
[root@node-3 ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
2、查看运行运行容器，指定命名空间： -n 空间名称
#查看所有运行容器实时更新状态
watch kubectl get pods -A -o wide
[root@node-3 ~]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-flannel kube-flannel-ds-jtgdx 0/1 CrashLoopBackOff 177 14h
kube-flannel kube-flannel-ds-ml786 0/1 CrashLoopBackOff 179 14h
kube-system coredns-59d64cd4d4-dgh95 0/1 ContainerCreating 0 15h
kube-system coredns-59d64cd4d4-qr5b6 0/1 ContainerCreating 0 15h
kube-system etcd-node-3 1/1 Running 0 15h
kube-system kube-apiserver-node-3 1/1 Running 0 15h
kube-system kube-controller-manager-node-3 1/1 Running 1 14h
kube-system kube-proxy-pcdjx 1/1 Running 0 15h
kube-system kube-proxy-zsbjd 1/1 Running 0 14h
kube-system kube-scheduler-node-3 1/1 Running 2 14h
kubernetes-dashboard dashboard-metrics-scraper-7c857855d9-748df 1/1 Running 0 12h
kubernetes-dashboard kubernetes-dashboard-bcf9d8968-vw7d4 0/1 CrashLoopBackOff 6 12m
3、查看单个pod容器状态，event节点显示pod的具体事件情况，pod异常可以查看该事件处理
[root@node-3 ~]# kubectl describe pod -n kubernetes-dashboard kubernetes-dashboard-bcf9d8968-vw7d4
Name: kubernetes-dashboard-bcf9d8968-vw7d4
Namespace: kubernetes-dashboard
Priority: 0
Node: node-1/192.168.254.130
Start Time: Wed, 20 Mar 2024 12:36:25 -0400
Labels: k8s-app=kubernetes-dashboard
pod-template-hash=bcf9d8968
Annotations: seccomp.security.alpha.kubernetes.io/pod: runtime/default
Status: Running
IP: 10.244.0.7
IPs:
IP: 10.244.0.7
Controlled By: ReplicaSet/kubernetes-dashboard-bcf9d8968
Containers:
kubernetes-dashboard:
Container ID: docker://e4c192a494ee62d00f7b9a02467781e1b50cdff6fac1ef0b2cf36c56842c4699
Image: kubernetesui/dashboard:v2.6.0
Image ID: docker-pullable://kubernetesui/dashboard@sha256:4af9580485920635d888efe1eddbd67e12f9d5d84dba87100e93feb4e46636b3
Port: 8443/TCP
Host Port: 0/TCP
Args:
--auto-generate-certificates
--namespace=kubernetes-dashboard
State: Running
Started: Wed, 20 Mar 2024 12:51:33 -0400
Last State: Terminated
Reason: Error
Exit Code: 2
Started: Wed, 20 Mar 2024 12:45:53 -0400
Finished: Wed, 20 Mar 2024 12:46:23 -0400
Ready: True
Restart Count: 7
Liveness: http-get https://:8443/ delay=30s timeout=30s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/certs from kubernetes-dashboard-certs (rw)
/tmp from tmp-volume (rw)
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-kzpfd (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kubernetes-dashboard-certs:
Type: Secret (a volume populated by a Secret)
SecretName: kubernetes-dashboard-certs
Optional: false
tmp-volume:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:
SizeLimit: <unset>
kube-api-access-kzpfd:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: kubernetes.io/os=linux
Tolerations: 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 15m default-scheduler Successfully assigned kubernetes-dashboard/kubernetes-dashboard-bcf9d8968-vw7d4 to node-1
Normal Pulled 15m kubelet Successfully pulled image "kubernetesui/dashboard:v2.6.0" in 4.554979473s
Normal Pulled 14m kubelet Successfully pulled image "kubernetesui/dashboard:v2.6.0" in 4.754875076s
Warning Unhealthy 14m kubelet Liveness probe failed: Get "https://10.244.0.7:8443/": dial tcp 10.244.0.7:8443: connect: connection refused
Normal Pulled 14m kubelet Successfully pulled image "kubernetesui/dashboard:v2.6.0" in 4.36192404s
Normal Pulling 13m (x4 over 15m) kubelet Pulling image "kubernetesui/dashboard:v2.6.0"
Normal Pulled 13m kubelet Successfully pulled image "kubernetesui/dashboard:v2.6.0" in 4.331921605s
Normal Created 13m (x4 over 15m) kubelet Created container kubernetes-dashboard
Normal Started 13m (x4 over 15m) kubelet Started container kubernetes-dashboard
Warning BackOff 5m34s (x31 over 14m) kubelet Back-off restarting failed container
Normal Pulled 36s kubelet Successfully pulled image "kubernetesui/dashboard:v2.6.0" in 4.65477593s
4、查看pod日志
[root@node-3 ~]# kubectl logs -n kubernetes-dashboard kubernetes-dashboard-bcf9d8968-vw7d4
2024/03/20 16:52:09 Starting overwatch
2024/03/20 16:52:09 Using namespace: kubernetes-dashboard
2024/03/20 16:52:09 Using in-cluster config to connect to apiserver
2024/03/20 16:52:09 Using secret token for csrf signing
2024/03/20 16:52:09 Initializing csrf token from kubernetes-dashboard-csrf secret
panic: Get "https://10.96.0.1:443/api/v1/namespaces/kubernetes-dashboard/secrets/kubernetes-dashboard-csrf": dial tcp 10.96.0.1:443: i/o timeout
goroutine 1 [running]:
github.com/kubernetes/dashboard/src/app/backend/client/csrf.(*csrfTokenManager).init(0xc00061faf0)
/home/runner/work/dashboard/dashboard/src/app/backend/client/csrf/manager.go:41 +0x30e
github.com/kubernetes/dashboard/src/app/backend/client/csrf.NewCsrfTokenManager(...)
/home/runner/work/dashboard/dashboard/src/app/backend/client/csrf/manager.go:66
github.com/kubernetes/dashboard/src/app/backend/client.(*clientManager).initCSRFKey(0xc0004cf300)
/home/runner/work/dashboard/dashboard/src/app/backend/client/manager.go:527 +0x94
github.com/kubernetes/dashboard/src/app/backend/client.(*clientManager).init(0x19f098c)
/home/runner/work/dashboard/dashboard/src/app/backend/client/manager.go:495 +0x32
github.com/kubernetes/dashboard/src/app/backend/client.NewClientManager(...)
/home/runner/work/dashboard/dashboard/src/app/backend/client/manager.go:594
main.main()
/home/runner/work/dashboard/dashboard/src/app/backend/dashboard.go:95 +0x1cf
5、删除pod
[root@node-3 ~]# kubectl delete pod -n kubernetes-dashboard kubernetes-dashboard-bcf9d8968-g68wk
pod "kubernetes-dashboard-bcf9d8968-g68wk" deleted
6、进入pod内部，查看应用日志等
kubectl exec -it <PodName> /bin/bash --namespace=<NAMESPACE>
# 进入Pod中指定容器
kubectl exec -it <PodName> -c <ContainerName> /bin/bash --namespace=<NAMESPACE>
7、pod的CRUD操作命令
1 增
1）create:[Create a resource by filename or stdin]
2）run:[ Run a particular image on the cluster]
3）apply:[Apply a configuration to a resource by filename or stdin]
4）proxy:[Run a proxy to the Kubernetes API server ]
2 删
1）delete:[Delete resources ]
3 改
1）scale:[Set a new size for a Replication Controller]
2）exec:[Execute a command in a container]
3）attach:[Attach to a running container]
4）patch:[Update field(s) of a resource by stdin]
5）edit:[Edit a resource on the server]
6） label:[Update the labels on a resource]
7）annotate:[Auto-scale a replication controller]
8）replace:[Replace a resource by filename or stdin]
9）config:[config modifies kubeconfig files]
4 查
1）get:[Display one or many resources]
2）describe:[Show details of a specific resource or group of resources]
3）log:[Print the logs for a container in a pod]
4）cluster-info:[Display cluster info]
5） version:[Print the client and server version information]
6）api-versions:[Print the supported API versions]
还有其他一些node隔离、恢复、调整资源、升级镜像，调整副本数量等等待更新。