kubectl常用命令

kubectl常用命令

#kubernetes命令自动补全（只针对当前bash）
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
​
#将get信息到处为yaml格式
kubectl get deploy kube-dns -n kube-system -o yaml > kube-dns.yaml
​
#更新yaml文件并更新服务（1.8版本开始改为apply）
kubectl update -f kube-dns.yaml
​
#编辑当前应用的配置
kubectl edit deployment nginx
​
#查看当前集群中的daemoset及详细信息
kubectl get ds --all-namespaces
kubectl describe daemonset kube-flannel-ds -n kube-system
​
#新建namespace
kubectl create namespace morata-namespace
​
#删除namespace
kubectl delete namespace morata-namespace
​
#设置节点为维护模式（即节点不可被调度，但不影响已有pod的运行）
kubectl cordon k8s-slave
#关闭维护模式
kubectl uncordon k8s-slave

#创建nginx，并且设置为2份
kubectl run nginx --image=nginx:1.7.9 --replicas=2

#删除deployment
kubectl delete deployment nginx

#查看所有deployment
kubectl get deployment
​
#查看nignx deployment的详细信息
kubectl describe deployment nginx
​
#查看pod
kubectl get pod
kubectl get pod nginx-6f8cf9fbc4-lvsqj -o wide
​
#查看pod详细信息
kubectl describe pod nginx-6f8cf9fbc4-lvsqj
​
#在pod中运行命令
kubectl exec nginx-6f8cf9fbc4-lvsqj ls

#进入pod
kubectl exec nginx-6f8cf9fbc4-lvsqj -it bash
​
#查看replicaset
kubectl get rs
​
#查看replicaset的详细信息
kubectl describe rs nginx-6f8cf9fbc4
​
#创建service
cat nginx.svc.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx
labels:
   app: nginx
spec:
ports:
 - name: http
   port: 8888
   nodePort: 30001
   targetPort: 80
selector:
   run: nginx
type: NodePort
 
kubectl create -f nginx.svc.yaml
kubectl expose deployment nginx --type=NodePort --name=nginx-test --port=80

# 删除service
kubectl delete -f nginx.svc.yam
kubectl delete svc nginx

#查看service及详细信息
kubectl get svc
kubectl describe svc nginx

#查看endpoint
kubectl get endpoints
NAME         ENDPOINTS                       AGE
kubernetes   192.168.8.250:6443              10h
nginx        10.244.0.13:80,10.244.1.31:80   5m
nginx-test   10.244.0.13:80,10.244.1.31:80   50s
#deployment扩容缩容
kubectl scale deployment nginx --replicas=3

kubectl scale deployment nginx --replicas=2
#查看ep、rs、pod都发生扩容/缩容
kubectl get endpoints
​
kubectl get rs
​
kubectl get pod

#滚动升级/回滚
#升级nginx至1.9.1
kubectl set image deploy nginx nginx=nginx:1.9.1

#查看升级状态
kubectl rollout status deployment nginx
​
 #查看升级历史
kubectl rollout history deployment nginx
​
#查看历史版本详情
kubectl rollout history deployment nginx --revision=2
​
#可以查看rs、deployemnt、svc、pod查看升级中的变化
kubectl get rs
kubectl get svc
kubectl get pod
kubectl get deployment

#查看deployment升级事件详情
kubectl describe deployment nginx
​
#升级失败回滚
kubectl set image deploy nginx nginx=nginx:1.95

 #查看升级状态一直处于等待状态
kubectl rollout status deployment nginx
Waiting for rollout to finish: 1 old replicas are pending termination...
 
 #可以查看升级历史、svc、rs、pod等详情可以得知错误原因
 
 #回滚操作
kubectl rollout undo deployment nginx
 
 #查看deployment回滚详情
kubectl describe deployment nginx