查看 Node状态

  1. [root@master dashboard]# kubectl  get nodes
  2. NAME     STATUS   ROLES    AGE   VERSION
  3. master   Ready    master   44h   v1.16.0
  4. node1    Ready    <none>   43h   v1.16.0
  5. node2    Ready    <none>   43h   v1.16.0
  7. [root@master dashboard]# kubectl  get node node1  //指定某个资源
  8. NAME    STATUS   ROLES    AGE   VERSION
  9. node1   Ready    <none>   43h   v1.16.0
  11. [root@master dashboard]# kubectl  get node node1 -o wide
  12. NAME    STATUS   ROLES    AGE   VERSION   INTERNAL-IP     EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION          CONTAINER-RUNTIME
  13. node1   Ready    <none>   43h   v1.16.0   192.168.81.31   <none>        CentOS Linux 7 (Core)   3.10.0-514.el7.x86_64   docker://20.10.17

查看 Service 信息

  1. [root@master dashboard]# kubectl  get service
  2. NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
  3. kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   44h

查看所有名称空间内资源

  1. [root@master dashboard]# kubectl  get pods --all-namespaces
  2. NAMESPACE              NAME                                         READY   STATUS             RESTARTS   AGE
  3. kube-flannel           kube-flannel-ds-4jrpc                        1/1     Running            0          43h
  4. kube-flannel           kube-flannel-ds-kwjzw                        1/1     Running            0          43h
  5. kube-flannel           kube-flannel-ds-zg8q8                        1/1     Running            0          43h
  6. kube-system            coredns-5644d7b6d9-bs4gj                     1/1     Running            0          44h
  7. kube-system            coredns-5644d7b6d9-xf25l                     1/1     Running            0          44h
  8. kube-system            etcd-master                                  1/1     Running            0          44h
  9. kube-system            kube-apiserver-master                        1/1     Running            0          23m
  10. kube-system            kube-controller-manager-master               1/1     Running            5          44h
  11. kube-system            kube-proxy-48lg7                             1/1     Running            0          43h
  12. kube-system            kube-proxy-hwwth                             1/1     Running            0          43h
  13. kube-system            kube-proxy-mp8tf                             1/1     Running            0          44h
  14. kube-system            kube-scheduler-master                        1/1     Running            4          44h
  15. kube-system            metrics-server-77946ff588-smqbt              0/1     ImagePullBackOff   0          30m
  16. kubernetes-dashboard   dashboard-metrics-scraper-76585494d8-2czfj   1/1     Running            0          17h
  17. kubernetes-dashboard   kubernetes-dashboard-5996555fd8-p8qgc        1/1     Running            0          17h
  19. 或者
  20. # kubectl get pods -A

同时查看多种资源信息

  1. [root@master dashboard]# kubectl  get svc,pod -n kube-system
  2. NAME                     TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                  AGE
  3. service/kube-dns         ClusterIP   10.96.0.10     <none>        53/UDP,53/TCP,9153/TCP   44h
  4. service/metrics-server   ClusterIP   10.99.145.57   <none>        443/TCP                  32m
  6. NAME                                  READY   STATUS             RESTARTS   AGE
  7. pod/coredns-5644d7b6d9-bs4gj          1/1     Running            0          44h
  8. pod/coredns-5644d7b6d9-xf25l          1/1     Running            0          44h
  9. pod/etcd-master                       1/1     Running            0          44h
  10. pod/kube-apiserver-master             1/1     Running            0          26m
  11. pod/kube-controller-manager-master    1/1     Running            5          44h
  12. pod/kube-proxy-48lg7                  1/1     Running            0          43h
  13. pod/kube-proxy-hwwth                  1/1     Running            0          43h
  14. pod/kube-proxy-mp8tf                  1/1     Running            0          44h
  15. pod/kube-scheduler-master             1/1     Running            4          44h
  16. pod/metrics-server-77946ff588-smqbt   0/1     ImagePullBackOff   0          32m

查看 API 对象细节

  1. 使用 kubectl describe 命令，查看一个 API 对象的细节：
  2. 注意：Events（事件） 值得你特别关注
  3. 在 Kubernetes 执行的过程中，
  4. 对 API 对象的所有重要操作，都会被记录在这个对象的 Events 里，
  5. 并且显示在 kubectl describe 指令返回的结果中。
  6. 比如，对于这个 Pod，我们可以看到它被创建之后，
  7. 被调度器调度（Successfully assigned）到了 node-1，
  8. 拉取了指定的镜像（pulling image），然后启动了 Pod 里定义的容器（Started container）。
  9. 这个部分正是我们将来进行 Debug 的重要依据。如果有异常发生，一定要第一时间查看这些 Events，
  10. 往往可以看到非常详细的错误信息。
  13. [root@master dashboard]# kubectl  describe  node node1
  14. Name:               node1
  15. Roles:              <none>
  16. Labels:             beta.kubernetes.io/arch=amd64
  17.                     beta.kubernetes.io/os=linux
  18.                     kubernetes.io/arch=amd64
  19.                     kubernetes.io/hostname=node1
  20.                     kubernetes.io/os=linux
  21. Annotations:        flannel.alpha.coreos.com/backend-data: {"VNI":1,"VtepMAC":"b6:19:ad:57:ef:06"}
  22.                     flannel.alpha.coreos.com/backend-type: vxlan
  23.                     flannel.alpha.coreos.com/kube-subnet-manager: true
  24.                     flannel.alpha.coreos.com/public-ip: 192.168.81.31
  25.                     kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
  26.                     node.alpha.kubernetes.io/ttl: 0
  27.                     volumes.kubernetes.io/controller-managed-attach-detach: true
  28. CreationTimestamp:  Tue, 06 Sep 2022 23:15:29 +0800
  31. 说明：无效但是显示出来的节点可以用delete删除：
  32. # kubectl delete node 192.168.245.252
  33. node "192.168.245.252" deleted
  35. 删除pod
  36. [root@master dashboard]# kubectl  delete pod  metrics-server-77946ff588-smqbt -n kube-system
  37. pod "metrics-server-77946ff588-smqbt" deleted
  39. kubectl delete pod <podname> -n <namespace>

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查看集群信息

  1. [root@master dashboard]# kubectl  cluster-info
  2. Kubernetes master is running at https://192.168.81.30:6443
  3. KubeDNS is running at https://192.168.81.30:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
  5. To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

查看各组件信息

  1. 使用安全连接：
  2. [root@master dashboard]# kubectl  -s  https://192.168.81.30:6443 get componentstatuses
  3. NAME                 STATUS    MESSAGE             ERROR
  4. controller-manager   Healthy   ok                  
  5. scheduler            Healthy   ok                  
  6. etcd-0               Healthy   {"health":"true"}   
  7. [root@master dashboard]# kubectl  -s  https://192.168.81.30:6443 get cs
  9. 未使用安全连接
  10. # kubectl -s http://localhost:8080 get componentstatuses

查看资源类型所对应的Apiversion

  1. [root@master dashboard]# kubectl  explain pod
  2. KIND:     Pod
  3. VERSION:  v1

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查看帮助

  1. # kubectl explain deployment
  2. # kubectl explain deployment.spec
  3. # kubectl explain deployment.spec.replicas

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