Kubernetes常用命令

Posted on 2017-09-24 Edited on 2023-09-27 In container

核心命令

kubectl get - list resources

kubectl describe - show detailed information about a resource

kubectl logs - print the logs from a container in a pod

kubectl exec - execute a command on a contain in a pod

1. get

1.1 查看nodes
kubectl get nodes

1.2 查看pod

kubectl get pod

1.3 查看deployment

kubectl get deployments

2. describe

2.1 查看详情

kubectl describe pods

kubectl describe pods $POD_NAME

kubectl describe nodes

3. exec

3.1 调用pod内部命令

kubectl exec -ti $POD_NAME curl localhost:8080

3.2 启动容器bash

kubectl exec -ti $POD_NAME bash （退出：exit）

4. 删除service

kubectl delete service -l run=kubernetes-bootcamp

5. 查看版本

kubectl version

6. 查看集群信息

kubectl cluster-info

7. 创建一个deployment

kubectl run kubernetes-bootcamp --image=docker.io/jocatalin/kubernetes-bootcamp:v1 --port=8080

8. 暴露服务到外网（即：创建一个service）

8.1 创建service
kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080 (port: 为pod监听的端口）
8.2 查看service

kubectl describe service
kubectl describe services/kubernetes-bootcamp

8.3 删除service

kubectl delete service $SERVICE_NAME

kubectl delete service -l run=kubernetes-bootcamp

9. 标签的使用（label）

9.1 打标签
kubectl label pod $POD_NAME app=v1

9.2 使用标签过滤
kubectl get pods -l app=v1

10. scale

kubectl scale deployments/kubernetes-bootcamp --replicas=2

11. 平滑升级、回滚

11.1 升级
kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2

11.2 检查状态
11.2.1 通过service访问服务接口
11.2.2 kubectl rollout status deployments/kubernetes-bootcamp
11.3 回滚
kubectl rollout undo deployments/kubernetes-bootcamp

12. namespace

kubectl create namespace mem-example

kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/memory-request-limit.yaml –namespace=mem-example

kubectl get pod memory-demo --namespace=mem-example
LINK Kubectl API