kubectl命令应用
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kubectl命令应用
kubectl常用操作
创建资源对象:
kubectl create -f xxx.yaml (不建议使用,无法更新,必须先delete)
kubectl apply -f xxx.yaml (创建+更新,可以重复使用)
删除资源对象:
kubectl delete -f xxx.yaml
重启pod:
(无法删除对应的应用,因为存在deployment/rc之类的副本控制器,删除pod也会重新拉起来)
kubectl get pod -n kube-system
查看pod描述:
kubectl describe pod XXX -n kube-system
查看pod 日志: (如果pod有多个容器需要加-c 容器名)
kubectl logs xxx -n kube-system
查看集群信息:
kubectl cluster-info
获取集群的所有命名空间
kubectl get namespaces
获取集群的所有resource:
kubectl get all
查看指定pod:
kubectl get pod $pod名称
查看pod的虚拟ip:
kubectl get pods -o wide
查看service:
kubectl get svc
kubectl get service
查看运行pod的环境变量:
kubectl exec podName env
查看指定pod的日志:
kubectl logs -f --tail 500 -n kube-system kube-apiserver-k8s-master
查看所有名称空间的service信息:
kubectl get svc -A
查看指定名称空间的service信息:
kubectl get svc -n kube-system
查看资源对象:
[root@master ~]# kubectl get pods 查看所有 pod 列表
NAME READY STATUS RESTARTS AGE
nginx-6799fc88d8-hnjrq 1/1 Running 1 22h
kubectl get pod -n kube -n 后跟 namespace, 查看指定的命名空间中的pod
#查看Service列表 svc是service简写,也可以写全拼
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h
nginx NodePort 10.111.131.14 <none> 80:31775/TCP 23h
#kubectl get pod,svc -o wide -o wide 查看详细信息
[root@master ~]# kubectl get pod,svc -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/nginx-6799fc88d8-hnjrq 1/1 Running 1 23h 10.244.2.3 node2 <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h <none>
service/nginx NodePort 10.111.131.14 <none> 80:31775/TCP 23h app=nginx
语法:kubectl get pod <pod-name> -o yaml
显示Pod更多信息
kubectl get pod <pod-name> -o wide ,列如:
[root@master ~]# kubectl get pod,rc -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/nginx-6799fc88d8-hnjrq 1/1 Running 1 23h 10.244.2.3 node2 <none> <none>
以yaml格式显示Pod的详细信息
[root@master ~]# kubectl get pod,svc -o yaml
apiVersion: v1
items:
- apiVersion: v1
kind: Pod
metadata:
creationTimestamp: "2021-08-26T05:50:56Z"
以自定义列名显示Pod的信息
[root@master ~]# kubectl get pod,svc -o=custom-columns=NAME:.metadata.name,RSRC:.metadata.resourceVersion
NAME RSRC
nginx-6799fc88d8-hnjrq 1926
kubernetes 202
nginx 1266
基于文件的自定义列名输出
[root@master ~]# kubectl get pods,svc -o=custom-columns-file=template.txt
NAME RSRC
nginx-6799fc88d8-hnjrq 1926
kubernetes 202
nginx 1266
[root@master ~]# kubectl get pods nginx-6799fc88d8-hnjrq -o=custom-columns-file=template.txt
NAME RSRC
nginx-6799fc88d8-hnjrq 1926
template.txt文件的内容为
NAME RSRC
metadata.name metadata.resourceVersion
创建一个deployment类型的容器
[root@master ~]# kubectl create deployment deploy-web --image=xialuo:v0.1 --replicas=3
deployment.apps/deploy-web created
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
deploy-web-dbc599567-tpvh4 0/1 ContainerCreating 0 12s
deploy-web-dbc599567-xhp26 0/1 ContainerCreating 0 12s
deploy-web-dbc599567-z4gxf 0/1 ContainerCreating 0 12s
nginx-6799fc88d8-hnjrq 1/1 Running 1 23h
删除
[root@master ~]# kubectl delete deployment deploy-web
deployment.apps "deploy-web" deleted
创建一个deployment类型的容器
[root@master ~]# kubectl create deployment deploy-web --image=xialuo:v0.1 --replicas=3
deployment.apps/deploy-web created
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
deploy-web-dbc599567-tpvh4 0/1 ContainerCreating 0 12s
deploy-web-dbc599567-xhp26 0/1 ContainerCreating 0 12s
deploy-web-dbc599567-z4gxf 0/1 ContainerCreating 0 12s
nginx-6799fc88d8-hnjrq 1/1 Running 1 23h
删除
[root@master ~]# kubectl delete deployment deploy-web
deployment.apps "deploy-web" deleted
实时监控拉取镜像的状态
[root@master ~]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
deploy-nginx-6b777fdcd5-8lrd4 0/1 ContainerCreating 0 63s
deploy-nginx-6b777fdcd5-bmk6q 0/1 ContainerCreating 0 63s
deploy-nginx-6b777fdcd5-mmtjk 0/1 ContainerCreating 0 63s
nginx-6799fc88d8-hnjrq 1/1 Running 1 23h
deploy-nginx-6b777fdcd5-bmk6q 0/1 ErrImagePull 0 67
暴露部署
[root@master ~]# kubectl expose deployment deploy-nginx --port=80 --protocol=TCP
service/deploy-nginx exposed
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
deploy-nginx ClusterIP 10.96.65.25 <none> 80/TCP 14s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h
nginx NodePort 10.111.131.14 <none> 80:31775/TCP 23h
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