Kubernetes（四）：常用操作

 1. 查看集群版本

[root@k8s-m1 ~]# kubectl version --short=true
Client Version: v1.15.2
Server Version: v1.15.2

 2.查看集群信息

[root@k8s-m1 ~]# kubectl cluster-info
Kubernetes master is running at https://192.168.2.124:6443
KubeDNS is running at https://192.168.2.124:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

 3. 查看所有node节点

[root@k8s-m1 ~]# kubectl get nodes
NAME     STATUS   ROLES    AGE   VERSION
k8s-m1   Ready    master   27h   v1.15.2
k8s-n1   Ready    <none>   27h   v1.15.2
k8s-n2   Ready    <none>   27h   v1.15.2

 4. 查看所有资源类型

# 第二列是缩写，一样可以被引用
[root@k8s-m1 ~]# 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

 5. 查看所有名称空间资源

[root@k8s-m1 ~]# kubectl get ns
NAME              STATUS   AGE
default           Active   28h
kube-node-lease   Active   28h
kube-public       Active   28h
kube-system       Active   28h

 6. 查看pod资源

# 默认查看的是default名称空间下的pod，如果查看其它名称空间需要用-n指定
[root@k8s-m1 ~]# kubectl get pods
[root@k8s-m1 ~]# kubectl get pods -n kube-system
NAME                             READY   STATUS    RESTARTS   AGE
coredns-5c98db65d4-mzw28         1/1     Running   0          28h
coredns-5c98db65d4-zl5cs         1/1     Running   0          28h
etcd-k8s-m1                      1/1     Running   0          28h
kube-apiserver-k8s-m1            1/1     Running   0          28h
kube-controller-manager-k8s-m1   1/1     Running   0          28h
kube-flannel-ds-amd64-qd5js      1/1     Running   0          28h
kube-flannel-ds-amd64-qq9td      1/1     Running   0          28h
kube-flannel-ds-amd64-xtpcg      1/1     Running   0          28h
kube-proxy-6q5dj                 1/1     Running   0          28h
kube-proxy-9p5qd                 1/1     Running   0          28h
kube-proxy-s97s9                 1/1     Running   0          28h
kube-scheduler-k8s-m1            1/1     Running   0          28h

 7. 创建一个名为nginx-deploy的deployment对象

[root@k8s-m1 ~]# kubectl run nginx-deploy --image=nginx:1.14 --replicas=2
# --image：指定镜像名字
# --replicas：为容器创建多少副本
[root@k8s-m1 ~]# kubectl get deploy -o wide
NAME           READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS     IMAGES       SELECTOR
nginx-deploy   2/2     2            2           3d14h   nginx-deploy   nginx:1.14   run=nginx-deploy
# 可以看到自动分配到两个Node节点上
[root@k8s-m1 ~]# kubectl get pod -o wide
NAME                           READY   STATUS    RESTARTS   AGE     IP           NODE     NOMINATED NODE   READINESS GATES
nginx-deploy-cdb7cc65c-949kr   1/1     Running   0          3d14h   10.244.1.3   k8s-n1   <none>           <none>
nginx-deploy-cdb7cc65c-hm6lh   1/1     Running   2          3d14h   10.244.2.4   k8s-n2   <none>           <none>

 8. 查看某名称空间中标签是k8s-app的pod

[root@k8s-m1 ~]# kubectl get pod -l k8s-app -n kube-system
NAME                       READY   STATUS    RESTARTS   AGE
coredns-5c98db65d4-mzw28   1/1     Running   0          4d
coredns-5c98db65d4-zl5cs   1/1     Running   0          4d
kube-proxy-6q5dj           1/1     Running   0          3d23h
kube-proxy-9p5qd           1/1     Running   0          4d
kube-proxy-s97s9           1/1     Running   0          3d23h

 9. 查看pod对象的日志

[root@k8s-m1 ~]# curl 10.244.2.4
[root@k8s-m1 ~]# kubectl logs -f nginx-deploy-cdb7cc65c-hm6lh
10.244.0.0 - - [18/Oct/2019:07:32:13 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
# -f：相当于tail的-f参数

 10. 在容器中执行命令

[root@k8s-m1 ~]# kubectl exec nginx-deploy-cdb7cc65c-hm6lh -- ls -l /home
total 0

  
  

写作不易，转载请注明出处，谢谢~~