官方文档：https://kubernetes.io/docs/reference/kubectl/overview/
1、从master节点获取node节点的信息
kubectl get node NAME STATUS ROLES AGE VERSION 10.57.27.19 Ready <none> 11d v1.14.0 10.57.27.20 Ready <none> 11d v1.14.0 10.57.27.29 Ready <none> 11d v1.14.0 10.57.30.10 Ready <none> 11d v1.14.0 10.57.30.9 Ready <none> 11d v1.14.0 10.57.33.10 Ready <none> 157d v1.14.0 10.57.33.11 Ready <none> 157d v1.14.0 10.57.33.12 Ready <none> 157d v1.14.0 10.57.33.13 Ready <none> 157d v1.14.0 10.57.33.14 Ready <none> 88d v1.14.0 获取某个node kubectl get node 10.57.33.36 NAME STATUS ROLES AGE VERSION 10.57.33.36 Ready <none> 58d v1.14.0
2、从master节点获取node节点的资源使用情况
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% 10.57.27.20 1569m 4% 2419Mi 1% 10.57.27.29 2380m 5% 17834Mi 9% 10.57.30.10 4597m 14% 46666Mi 25% 10.57.30.9 5354m 16% 54264Mi 29% 10.57.33.10 4901m 12% 143382Mi 79% 10.57.33.11 2528m 6% 22361Mi 12% 10.57.33.12 3672m 9% 155182Mi 85% 10.57.33.13 10716m 26% 113048Mi 62% 获取某个node节点的 kubectl top node 10.57.33.36 NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% 10.57.33.36 8730m 21% 152082Mi 84%
3、获取集群的信息
kubectl cluster-info Kubernetes master is running at https://10.57.33.6:443 Heapster is running at https://10.57.33.6:443/api/v1/namespaces/kube-system/services/heapster/proxy To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
4、获取集群版本信息
kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.0", GitCommit:"641856db18352033a0d96dbc99153fa3b27298e5", GitTreeState:"clean", BuildDate:"2019-03-25T15:53:57Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.0", GitCommit:"641856db18352033a0d96dbc99153fa3b27298e5", GitTreeState:"clean", BuildDate:"2019-03-25T15:45:25Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
5、获取目前API接口信息
kubectl api-resources NAME SHORTNAMES APIGROUP NAMESPACED KIND bindings true Binding componentstatuses cs false ComponentStatus configmaps cm true ConfigMap endpoints ep true Endpoints events ev true Event limitranges limits true LimitRange namespaces ns false Namespace nodes no false Node persistentvolumeclaims pvc true PersistentVolumeClaim persistentvolumes pv false PersistentVolume pods po true Pod podtemplates true PodTemplate replicationcontrollers rc true ReplicationController resourcequotas quota true ResourceQuota secrets true Secret serviceaccounts sa true ServiceAccount services svc true Service mutatingwebhookconfigurations admissionregistration.k8s.io false MutatingWebhookConfiguration validatingwebhookconfigurations admissionregistration.k8s.io false ValidatingWebhookConfiguration customresourcedefinitions crd,crds apiextensions.k8s.io false CustomResourceDefinition apiservices apiregistration.k8s.io false APIService controllerrevisions apps true ControllerRevision daemonsets ds apps true DaemonSet deployments deploy apps true Deployment replicasets rs apps true ReplicaSet statefulsets sts apps true StatefulSet tokenreviews authentication.k8s.io false TokenReview localsubjectacce***eviews authorization.k8s.io true LocalSubjectAcce***eview selfsubjectacce***eviews authorization.k8s.io false SelfSubjectAcce***eview selfsubjectrulesreviews authorization.k8s.io false SelfSubjectRulesReview subjectacce***eviews authorization.k8s.io false SubjectAcce***eview horizontalpodautoscalers hpa autoscaling true HorizontalPodAutoscaler cronjobs cj batch true CronJob jobs batch true Job certificatesigningrequests csr certificates.k8s.io false CertificateSigningRequest leases coordination.k8s.io true Lease events ev events.k8s.io true Event daemonsets ds extensions true DaemonSet deployments deploy extensions true Deployment ingresses ing extensions true Ingress networkpolicies netpol extensions true NetworkPolicy podsecuritypolicies psp extensions false PodSecurityPolicy replicasets rs extensions true ReplicaSet redisclusters redis k8s.tongdun.cn true RedisCluster mpijobs mj,mpij kubeflow.org true MPIJob turingjupyternotebooks tjn ml.tongdun.net true TuringJupyterNotebook ingresses ing networking.k8s.io true Ingress networkpolicies netpol networking.k8s.io true NetworkPolicy runtimeclasses node.k8s.io false RuntimeClass poddisruptionbudgets pdb policy true PodDisruptionBudget podsecuritypolicies psp policy false PodSecurityPolicy clusterrolebindings rbac.authorization.k8s.io false ClusterRoleBinding clusterroles rbac.authorization.k8s.io false ClusterRole rolebindings rbac.authorization.k8s.io true RoleBinding roles rbac.authorization.k8s.io true Role priorityclasses pc scheduling.k8s.io false PriorityClass csidrivers storage.k8s.io false CSIDriver csinodes storage.k8s.io false CSINode storageclasses sc storage.k8s.io false StorageClass volumeattachments storage.k8s.io false VolumeAttachment
6、获取描述信息
kubectl describe node 可以获取所有node节点的信息，但是信息量太大，所以后面+nodeIP查看具体某个node节点的信息 kubectl describe node 10.57.33.36 Name: 10.57.33.36 Roles: <none> Labels: beta.kubernetes.io/arch=amd64 beta.kubernetes.io/os=linux kubernetes.io/arch=amd64 kubernetes.io/hostname=10.57.33.36 kubernetes.io/os=linux servertype=general Annotations: node.alpha.kubernetes.io/ttl: 0 volumes.kubernetes.io/controller-managed-attach-detach: true CreationTimestamp: Wed, 20 Mar 2019 17:27:43 +0800 Taints: <none> Unschedulable: false Conditions: Type Status LastHeartbeatTime LastTransitionTime Reason Message ---- ------ ----------------- ------------------ ------ ------- MemoryPressure False Sat, 18 May 2019 15:00:11 +0800 Wed, 15 May 2019 15:56:33 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available DiskPressure False Sat, 18 May 2019 15:00:11 +0800 Wed, 15 May 2019 15:56:33 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure PIDPressure False Sat, 18 May 2019 15:00:11 +0800 Wed, 15 May 2019 15:56:33 +0800 KubeletHasSufficientPID kubelet has sufficient PID available Ready True Sat, 18 May 2019 15:00:11 +0800 Wed, 15 May 2019 15:56:33 +0800 KubeletReady kubelet is posting ready status Addresses: InternalIP: 10.57.33.36 Hostname: 10.57.33.36 Capacity: cpu: 40 ephemeral-storage: 5718194Mi hugepages-2Mi: 0 memory: 196681076Ki pods: 60 Allocatable: cpu: 40 ephemeral-storage: 5516284123127 hugepages-2Mi: 0 memory: 184818299Ki pods: 60 System Info: Machine ID: 0685cd808d8844c49c943381139b455f System UUID: C4BF926C-C489-03E1-B211-D21D80ED7D1B Boot ID: d68dbea4-1c3a-4c46-a423-f0c12d62e97b Kernel Version: 4.4.138-1.el7.elrepo.x86_64 OS Image: CentOS Linux 7 (Core) Operating System: linux Architecture: amd64 Container Runtime Version: docker://18.9.3 Kubelet Version: v1.14.0 Kube-Proxy Version: v1.14.0 PodCIDR: 10.57.81.128/26 Non-terminated Pods: (60 in total) Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE --------- ---- ------------ ---------- --------------- ------------- --- sentinel sentinel-velen-2 100m (0%) 1 (2%) 128Mi (0%) 512Mi (0%) 46h sh-inner sh-inner-dev-shine-inner-531-20190514-6f6dfc45f-sjm9w 250m (0%) 2 (5%) 1Gi (0%) 4000Mi (2%) 2d23h sh-inner sh-inner-smoke-shine-inner-531-20190514-798c7bb657-cxkbf 250m (0%) 2 (5%) 1Gi (0%) 4000Mi (2%) 2d22h sim-admin simadmin-test-common-7bdc7f6658-9tm98 100m (0%) 2 (5%) 512Mi (0%) 4000Mi (2%) 46h spe-asr spe-asr-smoke-v0-7-0-20190515-dc8bbc568-dwdcv 2 (5%) 16 (40%) 4Gi (2%) 16000Mi (8%) 2d22h str-server str-server-smoke-v20190517-7fdd746cc-mcdh6 500m (1%) 4 (10%) 2Gi (1%) 8000Mi (4%) 21h dd-kms dd-kms-dev-test-ty-5c666dc6b8-zzr4b 100m (0%) 4 (10%) 512Mi (0%) 8000Mi (4%) 48m datchman datchman-test-common-5c6fb69f66-bq5c7 100m (0%) 2 (5%) 512Mi (0%) 4000Mi (2%) 2d20h Allocated resources: (Total limits may be over 100 percent, i.e., overcommitted.) Resource Requests Limits -------- -------- ------ cpu 19724m (49%) 207 (517%) memory 73174Mi (40%) 424296Mi (235%) ephemeral-storage 0 (0%) 0 (0%) Events: <none>
7 配置node节点的调度策略
有时候会出现node节点异常等情况，这时候我们就不想将新的容器调度到异常的node节点，可以通过，以下命令对其处理，在关闭其调度策略的过程中，只会影响新的容器调度策略，不会影响已经正常运行的容器。
cordon Mark node as unschedulable uncordon Mark node as schedulable kubectl cordon 10.57.33.15 node/10.57.33.15 cordoned 10.57.33.15 NotReady,SchedulingDisabled <none> 83d v1.14.0 kubectl uncordon 10.57.33.15 node/10.57.33.15 uncordoned 10.57.33.15 NotReady <none> 83d v1.14.0