目录
1、查看版本信息：kubectl version
2、查看资源对象简写（缩写）：kubectl api-resources
3、查看集群信息：kubectl cluster-info
4、查看帮助信息：kubectl --help
5、node节点日志查看：journalctl -u kubelet -f
6、获取一个或多个资源信息：kubectl get
6.1、查看所有命名空间运行的pod信息： kubectl get pods -A
6.2、查看所有命名空间运行的pod详细信息： kubectl get pods -A -o wide
6.3、 查看所有资源对象：kubectl get all -A
6.4、查看node节点上的标签：kube get nodes --show-labels
6.5、查看pod节点上的标签：kubectl get pods --show-labels -A
6.6、查看节点状态信息：kubectl get cs
6.7、查看命名空间：kubectl get namespaces
7、创建命名空间 ：kubectl create ns app
8、删除命名空间：kubectl delete ns ceshi
9、在命名空间kube-public创建无状态控制器deployment来启动pod，暴露80端口，副本集为3
11、暴露发布pod中的服务供用户访问
12、删除pod中的nginx服务及service
13、查看endpoint的信息
14、修改/更新（镜像、参数......） kubectl set
15、调整副本集的数量：kubectl scale
16、查看详细信息：kubectl describe
16.1、显示所有的nodes的详细信息：kubectl describe nodes
16.2、查看某个node的详细信息
16.3、显示所有Pod的详细信息：kubectl describe pods
16.4、显示一个pod的详细信息 ：kubectl describe deploy/nginx
16.5、显示所有svc详细信息：kubectl describe svc
16.6、显示指定svc的详细信息：kubectl describe svc nginx-service
16.7、显示所有namespace的详细信息：kubectl describe ns
16.8、显示指定namespace的详细信息：kubectl describe ns kube-public
1、查看版本信息：kubectl version
[root@master ~]# kubectl version
[root@master ~]# kubectl versionClient Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3", GitCommit:"ca643a4d1f7bfe34773c74f79527be4afd95bf39", GitTreeState:"clean", BuildDate:"2021-07-15T21:04:39Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3", GitCommit:"ca643a4d1f7bfe34773c74f79527be4afd95bf39", GitTreeState:"clean", BuildDate:"2021-07-15T20:59:07Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}[root@master ~]# kubectl 2、查看资源对象简写（缩写）：kubectl api-resources
[root@master ~]# kubectl api-resources
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3", GitCommit:"ca643a4d1f7bfe34773c74f79527be4afd95bf39", GitTreeState:"clean", BuildDate:"2021-07-15T21:04:39Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3", GitCommit:"ca643a4d1f7bfe34773c74f79527be4afd95bf39", GitTreeState:"clean", BuildDate:"2021-07-15T20:59:07Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}[root@master ~]# kubectl api-resourcesNAME SHORTNAMES APIVERSION NAMESPACED KINDbindings v1 true Bindingcomponentstatuses cs v1 false ComponentStatusconfigmaps cm v1 true ConfigMapendpoints ep v1 true Endpointsevents ev v1 true Eventlimitranges limits v1 true LimitRangenamespaces ns v1 false Namespacenodes no v1 false Nodepersistentvolumeclaims pvc v1 true PersistentVolumeClaimpersistentvolumes pv v1 false PersistentVolumepods po v1 true Podpodtemplates v1 true PodTemplatereplicationcontrollers rc v1 true ReplicationControllerresourcequotas quota v1 true ResourceQuotasecrets v1 true Secretserviceaccounts sa v1 true ServiceAccountservices svc v1 true Servicemutatingwebhookconfigurations admissionregistration.k8s.io/v1 false MutatingWebhookConfigurationvalidatingwebhookconfigurations admissionregistration.k8s.io/v1 false ValidatingWebhookConfigurationcustomresourcedefinitions crd,crds apiextensions.k8s.io/v1 false CustomResourceDefinitionapiservices apiregistration.k8s.io/v1 false APIServicecontrollerrevisions apps/v1 true ControllerRevisiondaemonsets ds apps/v1 true DaemonSetdeployments deploy apps/v1 true Deploymentreplicasets rs apps/v1 true ReplicaSetstatefulsets sts apps/v1 true StatefulSettokenreviews authentication.k8s.io/v1 false TokenReviewlocalsubjectaccessreviews authorization.k8s.io/v1 true LocalSubjectAccessReviewselfsubjectaccessreviews authorization.k8s.io/v1 false SelfSubjectAccessReviewselfsubjectrulesreviews authorization.k8s.io/v1 false SelfSubjectRulesReviewsubjectaccessreviews authorization.k8s.io/v1 false SubjectAccessReviewhorizontalpodautoscalers hpa autoscaling/v1 true HorizontalPodAutoscalercronjobs cj batch/v1 true CronJobjobs batch/v1 true Jobcertificatesigningrequests csr certificates.k8s.io/v1 false CertificateSigningRequestleases coordination.k8s.io/v1 true Leaseendpointslices discovery.k8s.io/v1 true EndpointSliceevents ev events.k8s.io/v1 true Eventingresses ing extensions/v1beta1 true Ingressflowschemas flowcontrol.apiserver.k8s.io/v1beta1 false FlowSchemaprioritylevelconfigurations flowcontrol.apiserver.k8s.io/v1beta1 false PriorityLevelConfigurationingressclasses networking.k8s.io/v1 false IngressClassingresses ing networking.k8s.io/v1 true Ingressnetworkpolicies netpol networking.k8s.io/v1 true NetworkPolicyruntimeclasses node.k8s.io/v1 false RuntimeClasspoddisruptionbudgets pdb policy/v1 true PodDisruptionBudgetpodsecuritypolicies psp policy/v1beta1 false PodSecurityPolicyclusterrolebindings rbac.authorization.k8s.io/v1 false ClusterRoleBindingclusterroles rbac.authorization.k8s.io/v1 false ClusterRolerolebindings rbac.authorization.k8s.io/v1 true RoleBindingroles rbac.authorization.k8s.io/v1 true Rolepriorityclasses pc scheduling.k8s.io/v1 false PriorityClasscsidrivers storage.k8s.io/v1 false CSIDrivercsinodes storage.k8s.io/v1 false CSINodecsistoragecapacities storage.k8s.io/v1beta1 true CSIStorageCapacitystorageclasses sc storage.k8s.io/v1 false StorageClassvolumeattachments storage.k8s.io/v1 false VolumeAttachment3、查看集群信息：kubectl cluster-info
[root@master ~]# kubectl cluster-info
Kubernetes control plane is running at https://192.168.159.10:6443CoreDNS is running at https://192.168.159.10:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxyTo further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.4、查看帮助信息：kubectl --help
[root@master ~]# kubectl --help
kubectl controls the Kubernetes cluster manager. Find more information at: https://kubernetes.io/docs/reference/kubectl/overview/Basic Commands (Beginner): create Create a resource from a file or from stdin. expose 使用 replication controller, service, deployment 或者 pod 并暴露它作为一个 新的 KubernetesService run 在集群中运行一个指定的镜像 set 为 objects 设置一个指定的特征Basic Commands (Intermediate): explain 查看资源的文档 get 显示一个或更多 resources edit 在服务器上编辑一个资源 delete Delete resources by filenames, stdin, resources and names, or by resources and label selectorDeploy Commands: rollout Manage the rollout of a resource scale Set a new size for a Deployment, ReplicaSet or Replication Controller autoscale Auto-scale a Deployment, ReplicaSet, StatefulSet, or ReplicationControllerCluster Management Commands: certificate 修改 certificate 资源. cluster-info 显示集群信息 top 显示 Resource (CPU/Memory) 使用. cordon 标记 node 为 unschedulable uncordon 标记 node 为 schedulable drain Drain node in preparation for maintenance taint 更新一个或者多个 node 上的 taintsTroubleshooting and Debugging Commands: describe 显示一个指定 resource 或者 group 的 resources 详情 logs 输出容器在 pod 中的日志 attach Attach 到一个运行中的 container exec 在一个 container 中执行一个命令 port-forward Forward one or more local ports to a pod proxy 运行一个 proxy 到 Kubernetes API server cp 复制 files 和 directories 到 containers 和从容器中复制 files 和 directories. auth Inspect authorization debug Create debugging sessions for troubleshooting workloads and nodesAdvanced Commands: diff Diff live version against would-be applied version apply 通过文件名或标准输入流(stdin)对资源进行配置 patch Update field(s) of a resource replace 通过 filename 或者 stdin替换一个资源 wait Experimental: Wait for a specific condition on one or many resources. kustomize Build a kustomization target from a directory or URL.Settings Commands: label 更新在这个资源上的 labels annotate 更新一个资源的注解 completion Output shell completion code for the specified shell (bash or zsh)Other Commands: api-resources Print the supported API resources on the server api-versions Print the supported API versions on the server, in the form of "group/version" config 修改 kubeconfig 文件 plugin Provides utilities for interacting with plugins. version 输出 client 和 server 的版本信息Usage: kubectl [flags] [options]Use "kubectl <command> --help" for more information about a given command.Use "kubectl options" for a list of global command-line options (applies to all commands).官方帮助信息：Kubernetes kubectl 命令表 _ Kubernetes(K8S)中文文档_Kubernetes中文社区
http://docs.kubernetes.org.cn/683.html
5、node节点日志查看：journalctl -u kubelet -f
-- Logs begin at 三 2022-11-02 02:24:50 CST. --11月 01 19:51:04 master kubelet[13641]: I1101 19:51:04.415651 13641 pod_container_deletor.go:79] "Container not found in pod's containers" containerID="041b38b5bb2ff0161170bea161fd70e9175cc27fdc98877944d899ebe7b90d2f"11月 01 19:51:06 master kubelet[13641]: I1101 19:51:06.428325 13641 reconciler.go:196] "operationExecutor.UnmountVolume started for volume \"kubeconfig\" (UniqueName: \"kubernetes.io/host-path/771ef2517500c43b40e7df4c76198cac-kubeconfig\") pod \"771ef2517500c43b40e7df4c76198cac\" (UID: \"771ef2517500c43b40e7df4c76198cac\") "11月 01 19:51:06 master kubelet[13641]: I1101 19:51:06.428370 13641 operation_generator.go:829] UnmountVolume.TearDown succeeded for volume "kubernetes.io/host-path/771ef2517500c43b40e7df4c76198cac-kubeconfig" (OuterVolumeSpecName: "kubeconfig") pod "771ef2517500c43b40e7df4c76198cac" (UID: "771ef2517500c43b40e7df4c76198cac"). InnerVolumeSpecName "kubeconfig". PluginName "kubernetes.io/host-path", VolumeGidValue ""11月 01 19:51:06 master kubelet[13641]: I1101 19:51:06.529163 13641 reconciler.go:319] "Volume detached for volume \"kubeconfig\" (UniqueName: \"kubernetes.io/host-path/771ef2517500c43b40e7df4c76198cac-kubeconfig\") on node \"master\" DevicePath \"\""11月 01 19:51:07 master kubelet[13641]: I1101 19:51:07.282148 13641 kubelet_getters.go:300] "Path does not exist" path="/var/lib/kubelet/pods/771ef2517500c43b40e7df4c76198cac/volumes"11月 01 19:51:10 master kubelet[13641]: I1101 19:51:10.913108 13641 topology_manager.go:187] "Topology Admit Handler"11月 01 19:51:11 master kubelet[13641]: I1101 19:51:11.079185 13641 reconciler.go:224] "operationExecutor.VerifyControllerAttachedVolume started for volume \"kubeconfig\" (UniqueName: \"kubernetes.io/host-path/5e72c0f5a18f84d50f027106c98ab6b1-kubeconfig\") pod \"kube-scheduler-master\" (UID: \"5e72c0f5a18f84d50f027106c98ab6b1\") "11月 01 19:51:15 master kubelet[13641]: E1101 19:51:15.849398 13641 cadvisor_stats_provider.go:151] "Unable to fetch pod etc hosts stats" err="failed to get stats failed command 'du' ($ nice -n 19 du -x -s -B 1) on path /var/lib/kubelet/pods/771ef2517500c43b40e7df4c76198cac/etc-hosts with error exit status 1" pod="kube-system/kube-scheduler-master"11月 01 19:51:25 master kubelet[13641]: E1101 19:51:25.874999 13641 cadvisor_stats_provider.go:151] "Unable to fetch pod etc hosts stats" err="failed to get stats failed command 'du' ($ nice -n 19 du -x -s -B 1) on path /var/lib/kubelet/pods/771ef2517500c43b40e7df4c76198cac/etc-hosts with error exit status 1" pod="kube-system/kube-scheduler-master"11月 01 19:51:31 master kubelet[13641]: I1101 19:51:31.k8s中查看核心组件日志怎么看
①、通过kubeadm部署的：kubectl logs -f pod_组件名 -n namespace
或者 journalctl -u kubelet -f
②、二进制部署的：journalctl -u kubelet -f
6、获取一个或多个资源信息：kubectl get
语法格式：
kubectl get <resource> [-o wide | json| yaml] [-n namespace]
注释：
resource：可以是具体资源名称
-o ：指定输出格式
-n ：指定名称空间
6.1、查看所有命名空间运行的pod信息： kubectl get pods -A
[root@master ~]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGEkube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h35mkube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h35mkube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h35mkube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 5h45mkube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 5h45mkube-system etcd-master 1/1 Running 0 5h45mkube-system kube-apiserver-master 1/1 Running 0 5h45mkube-system kube-controller-manager-master 1/1 Running 0 5h11mkube-system kube-proxy-jwpnz 1/1 Running 0 5h40mkube-system kube-proxy-xqcqm 1/1 Running 0 5h41mkube-system kube-proxy-z6rhl 1/1 Running 0 5h45mkube-system kube-scheduler-master 1/1 Running 0 5h11m6.2、查看所有命名空间运行的pod详细信息： kubectl get pods -A -o wide
[root@master ~]# kubectl get pods -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESkube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h39m 192.168.159.13 node02 <none> <none>kube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h39m 192.168.159.11 node01 <none> <none>kube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h39m 192.168.159.10 master <none> <none>kube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 5h49m 10.150.2.2 node02 <none> <none>kube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 5h49m 10.150.1.2 node01 <none> <none>kube-system etcd-master 1/1 Running 0 5h49m 192.168.159.10 master <none> <none>kube-system kube-apiserver-master 1/1 Running 0 5h49m 192.168.159.10 master <none> <none>kube-system kube-controller-manager-master 1/1 Running 0 5h16m 192.168.159.10 master <none> <none>kube-system kube-proxy-jwpnz 1/1 Running 0 5h45m 192.168.159.13 node02 <none> <none>kube-system kube-proxy-xqcqm 1/1 Running 0 5h45m 192.168.159.11 node01 <none> <none>kube-system kube-proxy-z6rhl 1/1 Running 0 5h49m 192.168.159.10 master <none> <none>kube-system kube-scheduler-master 1/1 Running 0 5h15m 192.168.159.10 master <none> <none>
6.3、 查看所有资源对象：kubectl get all -A
[root@master ~]# kubectl get all -A
NAMESPACE NAME READY STATUS RESTARTS AGEkube-flannel pod/kube-flannel-ds-7whbw 1/1 Running 0 5h14mkube-flannel pod/kube-flannel-ds-nj4vl 1/1 Running 0 5h14mkube-flannel pod/kube-flannel-ds-w55x5 1/1 Running 0 5h14mkube-system pod/coredns-6f6b8cc4f6-lg6hc 1/1 Running 0 5h20mkube-system pod/coredns-6f6b8cc4f6-tdwhx 1/1 Running 0 5h20mkube-system pod/etcd-master 1/1 Running 0 5h20mkube-system pod/kube-apiserver-master 1/1 Running 0 5h20mkube-system pod/kube-controller-manager-master 1/1 Running 0 5h13mkube-system pod/kube-proxy-gv58r 1/1 Running 0 5h20mkube-system pod/kube-proxy-xd4lz 1/1 Running 0 5h18mkube-system pod/kube-proxy-zzs2s 1/1 Running 0 5h18mkube-system pod/kube-scheduler-master 1/1 Running 0 5h12mNAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEdefault service/kubernetes ClusterIP 10.125.0.1 <none> 443/TCP 5h20mdefault service/nginx-service NodePort 10.125.18.84 <none> 80:32476/TCP 5h3mkube-system service/kube-dns ClusterIP 10.125.0.10 <none> 53/UDP,53/TCP,9153/TCP 5h20mNAMESPACE NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGEkube-flannel daemonset.apps/kube-flannel-ds 3 3 3 3 3 <none> 5h14mkube-system daemonset.apps/kube-proxy 3 3 3 3 3 kubernetes.io/os=linux 5h20mNAMESPACE NAME READY UP-TO-DATE AVAILABLE AGEkube-system deployment.apps/coredns 2/2 2 2 5h20mNAMESPACE NAME DESIRED CURRENT READY AGEkube-system replicaset.apps/coredns-6f6b8cc4f6 2 2 2 5h20m6.4、查看node节点上的标签：kube get nodes --show-labels
[root@master ~]# kubectl get nodes --show-labels
NAME STATUS ROLES AGE VERSION LABELSmaster Ready control-plane,master 5h58m v1.21.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=,node.kubernetes.io/exclude-from-external-load-balancers=node01 Ready node 5h53m v1.21.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/node=nodenode02 Ready node 5h53m v1.21.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux,node-role.kubernetes.io/node=node6.5、查看pod节点上的标签：kubectl get pods --show-labels -A
[root@master ~]# kubectl get pods --show-labels -A
[root@master ~]# kubectl get pods --show-labels -ANAMESPACE NAME READY STATUS RESTARTS AGE LABELSkube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=nodekube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=nodekube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=nodekube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 6h1m k8s-app=kube-dns,pod-template-hash=6f6b8cc4f6kube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 6h1m k8s-app=kube-dns,pod-template-hash=6f6b8cc4f6kube-system etcd-master 1/1 Running 0 6h1m component=etcd,tier=control-planekube-system kube-apiserver-master 1/1 Running 0 6h1m component=kube-apiserver,tier=control-planekube-system kube-controller-manager-master 1/1 Running 0 5h27m component=kube-controller-manager,tier=control-planekube-system kube-proxy-jwpnz 1/1 Running 0 5h56m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1kube-system kube-proxy-xqcqm 1/1 Running 0 5h56m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1kube-system kube-proxy-z6rhl 1/1 Running 0 6h1m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1kube-system kube-scheduler-master 1/1 Running 0 5h26m component=kube-scheduler,tier=control-plane6.6、查看节点状态信息：kubectl get cs
[root@master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+NAME STATUS MESSAGE ERRORscheduler Healthy ok controller-manager Healthy ok etcd-0 Healthy {"health":"true"} 6.7、查看命名空间：kubectl get namespaces
或者使用缩写：[root@master ~]# kubectl get ns
[root@master ~]# kubectl get namespaceNAME STATUS AGEdefault Active 6h8mkube-flannel Active 5h58mkube-node-lease Active 6h8mkube-public Active 6h8mkube-system Active 6h8m7、创建命名空间 ：kubectl create ns app
[root@master ~]# kubectl create ns ceshinamespace/ceshi created
8、删除命名空间：kubectl delete ns ceshi
[root@master ~]# kubectl delete ns ceshinamespace "ceshi" deleted9、在命名空间kube-public创建无状态控制器deployment来启动pod，暴露80端口，副本集为3
在kube-public命名空间创建一个nginx
[root@master ~]# kubectl create deployment nginx --image=nginx:1.15 --port=80 --replicas=3 -n kube-public
[root@master ~]# kubectl create deployment nginx --image=nginx:1.15 --port=80 --replicas=3 -n kube-publicdeployment.apps/nginx created
11、暴露发布pod中的服务供用户访问
[root@master ~]# kubectl expose deployment nginx --port=80 --target-port=80 --name=nginx-service --type=NodePort -n kube-public
访问：
12、删除pod中的nginx服务及service
[root@master ~]# kubectl delete deployment nginx -n kube-public
[root@master ~]# kubectl delete svc -n kube-public nginx-service
13、查看endpoint的信息
[root@master ~]# kubectl get endpoints
14、修改/更新（镜像、参数......） kubectl set
例如：查看nginx的版本号：
需求：修改这个运行中的nginx的版本号
[root@master ~]# kubectl set image deployment/nginx nginx=nginx:1.11
过程中，他会先下载新的镜像进行创建，启动后删除老版本的容器
15、调整副本集的数量：kubectl scale
[root@master ~]# kubectl scale deployment nginx --replicas=5 -n default
deployment.apps/nginx scaled ## -n 指定namespace,本服务就创建在默认namespace中
16、查看详细信息：kubectl describe
16.1、显示所有的nodes的详细信息：kubectl describe nodes
[root@master ~]# kubectl describe nodes
16.2、查看某个node的详细信息
[root@master ~]# kubectl describe nodes node01
Name: node01Roles: nodeLabels: beta.kubernetes.io/arch=amd64 beta.kubernetes.io/os=linux kubernetes.io/arch=amd64 kubernetes.io/hostname=node01 kubernetes.io/os=linux node-role.kubernetes.io/node=nodeAnnotations: flannel.alpha.coreos.com/backend-data: {"VNI":1,"VtepMAC":"c2:b4:d2:1b:fa:c2"} flannel.alpha.coreos.com/backend-type: vxlan flannel.alpha.coreos.com/kube-subnet-manager: true flannel.alpha.coreos.com/public-ip: 192.168.159.13 kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock node.alpha.kubernetes.io/ttl: 0 volumes.kubernetes.io/controller-managed-attach-detach: trueCreationTimestamp: Sat, 05 Nov 2022 09:26:33 +0800Taints: <none>Unschedulable: falseLease: HolderIdentity: node01 AcquireTime: <unset> RenewTime: Sat, 05 Nov 2022 17:10:49 +0800Conditions: Type Status LastHeartbeatTime LastTransitionTime Reason Message ---- ------ ----------------- ------------------ ------ ------- NetworkUnavailable False Sat, 05 Nov 2022 09:31:06 +0800 Sat, 05 Nov 2022 09:31:06 +0800 FlannelIsUp Flannel is running on this node MemoryPressure False Sat, 05 Nov 2022 17:07:16 +0800 Sat, 05 Nov 2022 09:26:33 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available DiskPressure False Sat, 05 Nov 2022 17:07:16 +0800 Sat, 05 Nov 2022 09:26:33 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure PIDPressure False Sat, 05 Nov 2022 17:07:16 +0800 Sat, 05 Nov 2022 09:26:33 +0800 KubeletHasSufficientPID kubelet has sufficient PID available Ready True Sat, 05 Nov 2022 17:07:16 +0800 Sat, 05 Nov 2022 09:31:14 +0800 KubeletReady kubelet is posting ready statusAddresses: InternalIP: 192.168.159.13 Hostname: node01Capacity: cpu: 2 ephemeral-storage: 15349Mi hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 3861508Ki pods: 110Allocatable: cpu: 2 ephemeral-storage: 14485133698 hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 3759108Ki pods: 110System Info: Machine ID: 737b63dadf104cdaa76db981253e1baa System UUID: F0114D56-06E7-3FC5-4619-BAD443CE9F72 Boot ID: ca48a336-8e26-4d35-bd9b-2f403926c2b5 Kernel Version: 3.10.0-957.el7.x86_64 OS Image: CentOS Linux 7 (Core) Operating System: linux Architecture: amd64 Container Runtime Version: docker://20.10.21 Kubelet Version: v1.21.3 Kube-Proxy Version: v1.21.3PodCIDR: 10.150.2.0/24PodCIDRs: 10.150.2.0/24Non-terminated Pods: (6 in total) Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits Age --------- ---- ------------ ---------- --------------- ------------- --- default nginx-6fc77dcb7c-dq86p 0 (0%) 0 (0%) 0 (0%) 0 (0%) 45m default nginx-6fc77dcb7c-gv9qq 0 (0%) 0 (0%) 0 (0%) 0 (0%) 45m default nginx-6fc77dcb7c-hkcbb 0 (0%) 0 (0%) 0 (0%) 0 (0%) 49m kube-flannel kube-flannel-ds-nj4vl 100m (5%) 100m (5%) 50Mi (1%) 50Mi (1%) 7h40m kube-system coredns-6f6b8cc4f6-lg6hc 100m (5%) 0 (0%) 70Mi (1%) 170Mi (4%) 7h46m kube-system kube-proxy-xd4lz 0 (0%) 0 (0%) 0 (0%) 0 (0%) 7h44mAllocated resources: (Total limits may be over 100 percent, i.e., overcommitted.) Resource Requests Limits -------- -------- ------ cpu 200m (10%) 100m (5%) memory 120Mi (3%) 220Mi (5%) ephemeral-storage 0 (0%) 0 (0%) hugepages-1Gi 0 (0%) 0 (0%) hugepages-2Mi 0 (0%) 0 (0%)Events: <none>16.3、显示所有Pod的详细信息：kubectl describe pods
[root@master ~]# kubectl describe pods
16.4、显示一个pod的详细信息 ：kubectl describe deploy/nginx
[root@master ~]# kubectl describe deploy/nginx
[root@master ~]# kubectl describe deploy/nginxName: nginxNamespace: defaultCreationTimestamp: Sat, 05 Nov 2022 16:06:47 +0800Labels: app=nginxAnnotations: deployment.kubernetes.io/revision: 3Selector: app=nginxReplicas: 5 desired | 5 updated | 5 total | 5 available | 0 unavailableStrategyType: RollingUpdateMinReadySeconds: 0RollingUpdateStrategy: 25% max unavailable, 25% max surgePod Template: Labels: app=nginx Containers: nginx: Image: nginx:1.21 Port: 80/TCP Host Port: 0/TCP Environment: <none> Mounts: <none> Volumes: <none>Conditions: Type Status Reason ---- ------ ------ Progressing True NewReplicaSetAvailable Available True MinimumReplicasAvailableOldReplicaSets: <none>NewReplicaSet: nginx-6fc77dcb7c (5/5 replicas created)Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal ScalingReplicaSet 56m deployment-controller Scaled up replica set nginx-6fc77dcb7c to 1 Normal ScalingReplicaSet 56m deployment-controller Scaled down replica set nginx-897f8f586 to 2 Normal ScalingReplicaSet 52m (x5 over 56m) deployment-controller (combined from similar events): Scaled up replica set nginx-6fc77dcb7c to 516.5、显示所有svc详细信息：kubectl describe svc
[root@master ~]# kubectl describe svc
[root@master ~]# kubectl describe svcName: kubernetesNamespace: defaultLabels: component=apiserver provider=kubernetesAnnotations: <none>Selector: <none>Type: ClusterIPIP Family Policy: SingleStackIP Families: IPv4IP: 10.125.0.1IPs: 10.125.0.1Port: https 443/TCPTargetPort: 6443/TCPEndpoints: 192.168.159.12:6443Session Affinity: NoneEvents: <none>Name: nginx-serviceNamespace: defaultLabels: app=nginxAnnotations: <none>Selector: app=nginxType: NodePortIP Family Policy: SingleStackIP Families: IPv4IP: 10.125.204.159IPs: 10.125.204.159Port: <unset> 80/TCPTargetPort: 80/TCPNodePort: <unset> 30307/TCPEndpoints: 10.150.1.10:80,10.150.1.11:80,10.150.2.11:80 + 2 more...Session Affinity: NoneExternal Traffic Policy: ClusterEvents: <none>16.6、显示指定svc的详细信息：kubectl describe svc nginx-service
[root@master ~]# kubectl describe svc nginx-service
[root@master ~]# kubectl describe svc nginx-serviceName: nginx-serviceNamespace: defaultLabels: app=nginxAnnotations: <none>Selector: app=nginxType: NodePortIP Family Policy: SingleStackIP Families: IPv4IP: 10.125.204.159IPs: 10.125.204.159Port: <unset> 80/TCPTargetPort: 80/TCPNodePort: <unset> 30307/TCPEndpoints: 10.150.1.10:80,10.150.1.11:80,10.150.2.11:80 + 2 more...Session Affinity: NoneExternal Traffic Policy: ClusterEvents: <none>16.7、显示所有namespace的详细信息：kubectl describe ns
[root@master ~]# kubectl describe ns
[root@master ~]# kubectl describe nsName: ceshiLabels: kubernetes.io/metadata.name=ceshiAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.Name: defaultLabels: kubernetes.io/metadata.name=defaultAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.Name: kube-flannelLabels: kubernetes.io/metadata.name=kube-flannel pod-security.kubernetes.io/enforce=privilegedAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.Name: kube-node-leaseLabels: kubernetes.io/metadata.name=kube-node-leaseAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.Name: kube-publicLabels: kubernetes.io/metadata.name=kube-publicAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.Name: kube-systemLabels: kubernetes.io/metadata.name=kube-systemAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.16.8、显示指定namespace的详细信息：kubectl describe ns kube-public
[root@master ~]# kubectl describe ns kube-public
[root@master ~]# kubectl describe ns publicError from server (NotFound): namespaces "public" not found[root@master ~]# kubectl describe ns kube-publicName: kube-publicLabels: kubernetes.io/metadata.name=kube-publicAnnotations: <none>Status: ActiveNo resource quota.No LimitRange resource.故障现象：节点3个node 1个master1、现在创建一个pod，发现结果是pod无法创建
kubectl describe po pod_name-n namespaces
events:
调度器正常完成工作正常退出pod 创建失败，可能原因之一：资源现在问题
