[K8S] 常用查看命令

青旅半醒 2022-09-03 15:11 151阅读 0赞

@查看master组件状态 kubectl get cs

[root@k8s-master ~]# kubectl get cs
    Warning: v1 ComponentStatus is deprecated in v1.19+
    NAME                 STATUS    MESSAGE             ERROR
    controller-manager   Healthy   ok
    scheduler            Healthy   ok
    etcd-0               Healthy   {"health":"true"}
    [root@k8s-master ~]#

@查看资源 kubectl api-resources  
说明：可以查看各个资源的版本，写yaml文件会用到；可以看资源的缩写

[root@k8s-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
    ……
    daemonsets                        ds           apps/v1                                true         DaemonSet
    deployments                       deploy       apps/v1                                true         Deployment
    ……

@查看资源信息，kubectl get --help，kubectl describe --help  
kubectl get <resource>  
kubectl describe <resource> <name>

kubectl get pods  
kubectl get pods **-o wide** 查看详细信息  
kubectl get pods <pod name> 查看具体的pod  
kubectl get pods  **--show-labels** 查看标签  
kubectl get pods  **-l <key>=<value>** 查看具有某标签的pod  
kubectl describe pods <pod name> 查看具体pod的详细信息  
kubectl get pod,deploy,svc 查看pod,deployment和service

@查看控制平面和集群服务 kubectl cluster-info

[root@k8s-master ~]# kubectl cluster-info
    Kubernetes control plane is running at https://192.168.231.121:6443
    KubeDNS is running at https://192.168.231.121:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
    Metrics-server is running at https://192.168.231.121:6443/api/v1/namespaces/kube-system/services/https:metrics-server:/proxy
    
    To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
    [root@k8s-master ~]#
    [root@k8s-master ~]# kubectl get svc -n kube-system
    NAME             TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                  AGE
    kube-dns         ClusterIP   10.96.0.10      <none>        53/UDP,53/TCP,9153/TCP   13d
    metrics-server   ClusterIP   10.96.228.107   <none>        443/TCP                  13d
    [root@k8s-master ~]#

@查看Node、Pod资源消耗，kubectl top ...  
kubectl top nodes  
kubectl top node <node name>  
kubectl top pods  
kubectl top pod <pod name>

[root@k8s-master ~]# kubectl top nodes k8s-node1
    NAME        CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
    k8s-node1   62m          3%     773Mi           44%
    [root@k8s-master ~]#
    [root@k8s-master ~]# kubectl top pods --sort-by=cpu
    NAME                         CPU(cores)   MEMORY(bytes)
    java-demo-56d54df448-ptww2   2m           162Mi
    java-demo-56d54df448-r5rv2   2m           168Mi
    java-demo-56d54df448-92n5q   2m           160Mi
    nginx-58f8c48d58-48xbn       0m           2Mi
    web-96d5df5c8-vjbzv          0m           4Mi
    web-96d5df5c8-l5m9f          0m           2Mi
    web-96d5df5c8-nqj6z          0m           2Mi
    [root@k8s-master ~]# kubectl top pods web-96d5df5c8-nqj6z
    NAME                  CPU(cores)   MEMORY(bytes)
    web-96d5df5c8-nqj6z   0m           2Mi
    [root@k8s-master ~]#

@查看日志  
说明: kubeadm部署方式，kubelet是systemd守护进程管理，其它是容器化部署

[root@k8s-master ~]# kubectl get pods -n kube-system
    NAME                                      READY   STATUS    RESTARTS   AGE
    calico-kube-controllers-97769f7c7-xh7j7   1/1     Running   6          13d
    calico-node-58ck4                         1/1     Running   8          13d
    calico-node-q6qxm                         1/1     Running   6          13d
    calico-node-vmmv5                         1/1     Running   6          13d
    coredns-7f89b7bc75-mgtnj                  1/1     Running   6          13d
    coredns-7f89b7bc75-wkrjq                  1/1     Running   6          13d
    etcd-k8s-master                           1/1     Running   6          13d
    kube-apiserver-k8s-master                 1/1     Running   6          13d
    kube-controller-manager-k8s-master        1/1     Running   1          34h
    kube-proxy-clmzc                          1/1     Running   6          13d
    kube-proxy-f4mk4                          1/1     Running   6          13d
    kube-proxy-s7n6w                          1/1     Running   6          13d
    kube-scheduler-k8s-master                 1/1     Running   1          34h
    metrics-server-84f9866fdf-9l6rt           1/1     Running   3          2d
    [root@k8s-master ~]#

kubelet => journalctl -u kubelet

kubectl logs <pod name>  
kubectl logs -f <pod name>  
kubectl logs -f <pod name> -c <container name> 多个容器不指定默认进入第一个

进入容器终端 kubectl exec -it <pod name> -c <container name> -- bash