云原生之kubectl命令详解
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 version
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
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-resources
NAME SHORTNAMES APIVERSION NAMESPACED KIND
bindings v1 true Binding
componentstatuses cs v1 false ComponentStatus
configmaps cm v1 true ConfigMap
endpoints ep v1 true Endpoints
events ev v1 true Event
limitranges limits v1 true LimitRange
namespaces ns v1 false Namespace
nodes no v1 false Node
persistentvolumeclaims pvc v1 true PersistentVolumeClaim
persistentvolumes pv v1 false PersistentVolume
pods po v1 true Pod
podtemplates v1 true PodTemplate
replicationcontrollers rc v1 true ReplicationController
resourcequotas quota v1 true ResourceQuota
secrets v1 true Secret
serviceaccounts sa v1 true ServiceAccount
services svc v1 true Service
mutatingwebhookconfigurations admissionregistration.k8s.io/v1 false MutatingWebhookConfiguration
validatingwebhookconfigurations admissionregistration.k8s.io/v1 false ValidatingWebhookConfiguration
customresourcedefinitions crd,crds apiextensions.k8s.io/v1 false CustomResourceDefinition
apiservices apiregistration.k8s.io/v1 false APIService
controllerrevisions apps/v1 true ControllerRevision
daemonsets ds apps/v1 true DaemonSet
deployments deploy apps/v1 true Deployment
replicasets rs apps/v1 true ReplicaSet
statefulsets sts apps/v1 true StatefulSet
tokenreviews authentication.k8s.io/v1 false TokenReview
localsubjectaccessreviews authorization.k8s.io/v1 true LocalSubjectAccessReview
selfsubjectaccessreviews authorization.k8s.io/v1 false SelfSubjectAccessReview
selfsubjectrulesreviews authorization.k8s.io/v1 false SelfSubjectRulesReview
subjectaccessreviews authorization.k8s.io/v1 false SubjectAccessReview
horizontalpodautoscalers hpa autoscaling/v1 true HorizontalPodAutoscaler
cronjobs cj batch/v1 true CronJob
jobs batch/v1 true Job
certificatesigningrequests csr certificates.k8s.io/v1 false CertificateSigningRequest
leases coordination.k8s.io/v1 true Lease
endpointslices discovery.k8s.io/v1 true EndpointSlice
events ev events.k8s.io/v1 true Event
ingresses ing extensions/v1beta1 true Ingress
flowschemas flowcontrol.apiserver.k8s.io/v1beta1 false FlowSchema
prioritylevelconfigurations flowcontrol.apiserver.k8s.io/v1beta1 false PriorityLevelConfiguration
ingressclasses networking.k8s.io/v1 false IngressClass
ingresses ing networking.k8s.io/v1 true Ingress
networkpolicies netpol networking.k8s.io/v1 true NetworkPolicy
runtimeclasses node.k8s.io/v1 false RuntimeClass
poddisruptionbudgets pdb policy/v1 true PodDisruptionBudget
podsecuritypolicies psp policy/v1beta1 false PodSecurityPolicy
clusterrolebindings rbac.authorization.k8s.io/v1 false ClusterRoleBinding
clusterroles rbac.authorization.k8s.io/v1 false ClusterRole
rolebindings rbac.authorization.k8s.io/v1 true RoleBinding
roles rbac.authorization.k8s.io/v1 true Role
priorityclasses pc scheduling.k8s.io/v1 false PriorityClass
csidrivers storage.k8s.io/v1 false CSIDriver
csinodes storage.k8s.io/v1 false CSINode
csistoragecapacities storage.k8s.io/v1beta1 true CSIStorageCapacity
storageclasses sc storage.k8s.io/v1 false StorageClass
volumeattachments 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://192.168.159.10:6443
CoreDNS is running at https://192.168.159.10:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To 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 Kubernetes
Service
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 selector
Deploy 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 ReplicationController
Cluster 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 taints
Troubleshooting 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 nodes
Advanced 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 --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
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 AGE
kube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h35m
kube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h35m
kube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h35m
kube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 5h45m
kube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 5h45m
kube-system etcd-master 1/1 Running 0 5h45m
kube-system kube-apiserver-master 1/1 Running 0 5h45m
kube-system kube-controller-manager-master 1/1 Running 0 5h11m
kube-system kube-proxy-jwpnz 1/1 Running 0 5h40m
kube-system kube-proxy-xqcqm 1/1 Running 0 5h41m
kube-system kube-proxy-z6rhl 1/1 Running 0 5h45m
kube-system kube-scheduler-master 1/1 Running 0 5h11m
6.2、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 GATES
kube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h39m 192.168.159.13 node02
kube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h39m 192.168.159.11 node01
kube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h39m 192.168.159.10 master
kube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 5h49m 10.150.2.2 node02
kube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 5h49m 10.150.1.2 node01
kube-system etcd-master 1/1 Running 0 5h49m 192.168.159.10 master
kube-system kube-apiserver-master 1/1 Running 0 5h49m 192.168.159.10 master
kube-system kube-controller-manager-master 1/1 Running 0 5h16m 192.168.159.10 master
kube-system kube-proxy-jwpnz 1/1 Running 0 5h45m 192.168.159.13 node02
kube-system kube-proxy-xqcqm 1/1 Running 0 5h45m 192.168.159.11 node01
kube-system kube-proxy-z6rhl 1/1 Running 0 5h49m 192.168.159.10 master
kube-system kube-scheduler-master 1/1 Running 0 5h15m 192.168.159.10 master
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 AGE
kube-flannel pod/kube-flannel-ds-7whbw 1/1 Running 0 5h14m
kube-flannel pod/kube-flannel-ds-nj4vl 1/1 Running 0 5h14m
kube-flannel pod/kube-flannel-ds-w55x5 1/1 Running 0 5h14m
kube-system pod/coredns-6f6b8cc4f6-lg6hc 1/1 Running 0 5h20m
kube-system pod/coredns-6f6b8cc4f6-tdwhx 1/1 Running 0 5h20m
kube-system pod/etcd-master 1/1 Running 0 5h20m
kube-system pod/kube-apiserver-master 1/1 Running 0 5h20m
kube-system pod/kube-controller-manager-master 1/1 Running 0 5h13m
kube-system pod/kube-proxy-gv58r 1/1 Running 0 5h20m
kube-system pod/kube-proxy-xd4lz 1/1 Running 0 5h18m
kube-system pod/kube-proxy-zzs2s 1/1 Running 0 5h18m
kube-system pod/kube-scheduler-master 1/1 Running 0 5h12m
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default service/kubernetes ClusterIP 10.125.0.1 443/TCP 5h20m
default service/nginx-service NodePort 10.125.18.84 80:32476/TCP 5h3m
kube-system service/kube-dns ClusterIP 10.125.0.10 53/UDP,53/TCP,9153/TCP 5h20m
NAMESPACE NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
kube-flannel daemonset.apps/kube-flannel-ds 3 3 3 3 3 5h14m
kube-system daemonset.apps/kube-proxy 3 3 3 3 3 kubernetes.io/os=linux 5h20m
NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE
kube-system deployment.apps/coredns 2/2 2 2 5h20m
NAMESPACE NAME DESIRED CURRENT READY AGE
kube-system replicaset.apps/coredns-6f6b8cc4f6 2 2 2 5h20m
6.4、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 LABELS
master 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=node
node02 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=node
6.5、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 -A
NAMESPACE NAME READY STATUS RESTARTS AGE LABELS
kube-flannel kube-flannel-ds-7clld 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=node
kube-flannel kube-flannel-ds-psgvb 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=node
kube-flannel kube-flannel-ds-xxncr 1/1 Running 0 5h51m app=flannel,controller-revision-hash=5b775b5b5c,pod-template-generation=1,tier=node
kube-system coredns-6f6b8cc4f6-lbvl5 1/1 Running 0 6h1m k8s-app=kube-dns,pod-template-hash=6f6b8cc4f6
kube-system coredns-6f6b8cc4f6-m6brz 1/1 Running 0 6h1m k8s-app=kube-dns,pod-template-hash=6f6b8cc4f6
kube-system etcd-master 1/1 Running 0 6h1m component=etcd,tier=control-plane
kube-system kube-apiserver-master 1/1 Running 0 6h1m component=kube-apiserver,tier=control-plane
kube-system kube-controller-manager-master 1/1 Running 0 5h27m component=kube-controller-manager,tier=control-plane
kube-system kube-proxy-jwpnz 1/1 Running 0 5h56m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1
kube-system kube-proxy-xqcqm 1/1 Running 0 5h56m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1
kube-system kube-proxy-z6rhl 1/1 Running 0 6h1m controller-revision-hash=6b87fcb57c,k8s-app=kube-proxy,pod-template-generation=1
kube-system kube-scheduler-master 1/1 Running 0 5h26m component=kube-scheduler,tier=control-plane
6.6、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 ERROR
scheduler 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 namespace
NAME STATUS AGE
default Active 6h8m
kube-flannel Active 5h58m
kube-node-lease Active 6h8m
kube-public Active 6h8m
kube-system Active 6h8m
7、创建命名空间 ：kubectl create ns app
[root@master ~]# kubectl create ns ceshi
namespace/ceshi created
8、删除命名空间：kubectl delete ns ceshi
[root@master ~]# kubectl delete ns ceshi
namespace "ceshi" deleted
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
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-public
deployment.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: node01
Roles: node
Labels: 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=node
Annotations: 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: true
CreationTimestamp: Sat, 05 Nov 2022 09:26:33 +0800
Taints:
Unschedulable: false
Lease:
HolderIdentity: node01
AcquireTime:
RenewTime: Sat, 05 Nov 2022 17:10:49 +0800
Conditions:
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 status
Addresses:
InternalIP: 192.168.159.13
Hostname: node01
Capacity:
cpu: 2
ephemeral-storage: 15349Mi
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 3861508Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 14485133698
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 3759108Ki
pods: 110
System 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: v1.21.3
PodCIDR: 10.150.2.0/24
PodCIDRs: 10.150.2.0/24
Non-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%) 7h44m
Allocated 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:
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/nginx
Name: nginx
Namespace: default
CreationTimestamp: Sat, 05 Nov 2022 16:06:47 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 3
Selector: app=nginx
Replicas: 5 desired | 5 updated | 5 total | 5 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.21
Port: 80/TCP
Host Port: 0/TCP
Environment:
Mounts:
Volumes:
Conditions:
Type Status Reason
---- ------ ------
Progressing True NewReplicaSetAvailable
Available True MinimumReplicasAvailable
OldReplicaSets:
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 5
16.5、显示所有svc详细信息：kubectl describe svc
[root@master ~]# kubectl describe svc
[root@master ~]# kubectl describe svc
Name: kubernetes
Namespace: default
Labels: component=apiserver
provider=kubernetes
Annotations:
Selector:
Type: ClusterIP
IP Family Policy: SingleStack
IP Families: IPv4
IP: 10.125.0.1
IPs: 10.125.0.1
Port: https 443/TCP
TargetPort: 6443/TCP
Endpoints: 192.168.159.12:6443
Session Affinity: None
Events:
Name: nginx-service
Namespace: default
Labels: app=nginx
Annotations:
Selector: app=nginx
Type: NodePort
IP Family Policy: SingleStack
IP Families: IPv4
IP: 10.125.204.159
IPs: 10.125.204.159
Port: 80/TCP
TargetPort: 80/TCP
NodePort: 30307/TCP
Endpoints: 10.150.1.10:80,10.150.1.11:80,10.150.2.11:80 + 2 more...
Session Affinity: None
External Traffic Policy: Cluster
Events:
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-service
Name: nginx-service
Namespace: default
Labels: app=nginx
Annotations:
Selector: app=nginx
Type: NodePort
IP Family Policy: SingleStack
IP Families: IPv4
IP: 10.125.204.159
IPs: 10.125.204.159
Port: 80/TCP
TargetPort: 80/TCP
NodePort: 30307/TCP
Endpoints: 10.150.1.10:80,10.150.1.11:80,10.150.2.11:80 + 2 more...
Session Affinity: None
External Traffic Policy: Cluster
Events:
16.7、显示所有namespace的详细信息：kubectl describe ns
[root@master ~]# kubectl describe ns
[root@master ~]# kubectl describe ns
Name: ceshi
Labels: kubernetes.io/metadata.name=ceshi
Annotations:
Status: Active
No resource quota.
No LimitRange resource.
Name: default
Labels: kubernetes.io/metadata.name=default
Annotations:
Status: Active
No resource quota.
No LimitRange resource.
Name: kube-flannel
Labels: kubernetes.io/metadata.name=kube-flannel
pod-security.kubernetes.io/enforce=privileged
Annotations:
Status: Active
No resource quota.
No LimitRange resource.
Name: kube-node-lease
Labels: kubernetes.io/metadata.name=kube-node-lease
Annotations:
Status: Active
No resource quota.
No LimitRange resource.
Name: kube-public
Labels: kubernetes.io/metadata.name=kube-public
Annotations:
Status: Active
No resource quota.
No LimitRange resource.
Name: kube-system
Labels: kubernetes.io/metadata.name=kube-system
Annotations:
Status: Active
No 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 public
Error from server (NotFound): namespaces "public" not found
[root@master ~]# kubectl describe ns kube-public
Name: kube-public
Labels: kubernetes.io/metadata.name=kube-public
Annotations:
Status: Active
No 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
