Kubernetes 基本操作

[TOC]

Kubernetes deployment的scale out， scale down

扩容

kubectl scale deployments/<name> --replicas=4
查看扩容结果：
kubectl get deployments <name>

$ kubectl get pods -o wide
NAME                                   READY     STATUS    RESTARTS   AGE       IP           NODE
kubernetes-bootcamp-5c69669756-rgzzp   1/1       Running   0          9m        172.18.0.5   minikube
kubernetes-bootcamp-5c69669756-zw7x6   1/1       Running   0          11m       172.18.0.2   minikube

缩容

kubectl scale deployments/kubernetes-bootcamp --replicas=2
将kubernetes-bootcamp缩容到两个副本；
查看缩容结果：

$ kubectl get pods -o wide
NAME                                   READY     STATUS        RESTARTS   AGE       IP           NODE
kubernetes-bootcamp-5c69669756-p6969   1/1       Terminating   0          9m        172.18.0.7   minikube
kubernetes-bootcamp-5c69669756-rgzzp   1/1       Running       0          9m        172.18.0.5   minikube
kubernetes-bootcamp-5c69669756-t6rrt   1/1       Terminating   0          9m        172.18.0.6   minikube
kubernetes-bootcamp-5c69669756-zw7x6   1/1       Running       0          11m       172.18.0.2   minikube

$ kubectl get pods -o wide
NAME                                   READY     STATUS    RESTARTS   AGE       IP           NODE
kubernetes-bootcamp-5c69669756-rgzzp   1/1       Running   0          9m        172.18.0.5   minikube
kubernetes-bootcamp-5c69669756-zw7x6   1/1       Running   0          11m       172.18.0.2   minikube

Rolling Update

通过指定新的镜像对deployment进行升级：
kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatatlin/kubernetes-bootcamp:v2

kubectl set image <deployment name> <deployment name>=<new image path and name>

rollout管理：

• rollout状态查看：
  kubectl rollout status deployments/<deployment name>
• rollout撤销：
  kuberctl rollout undo deployments/<deployment name>