OS Ubuntu 18.04.1 LTS
docker 18.06.0-ce
首先准备2个不同版本的镜像，用于测试（已经在阿里云上创建好2个不同版本的nginx镜像）
docker pull registry.cn-beijing.aliyuncs.com/mrvolleyball/nginx:v1 docker pull registry.cn-beijing.aliyuncs.com/mrvolleyball/nginx:v2这两个镜像只有版本号不同，其他的都一样
root@k8s-master:~# docker run -d --rm -p 10080:80 nginx:v1 e88097841c5feef92e4285a2448b943934ade5d86412946bc8d86e262f80a050 root@k8s-master:~# curl :10080 ---------- version: v1 hostname: f5189a5d3ad3 四、更新镜像的三种方法我们首先准备一个yaml文件用于测试：
root@k8s-master:~# more image_update.yaml apiVersion: extensions/v1beta1 kind: Deployment metadata: name: image-deployment spec: replicas: 1 template: metadata: labels: app: image-update spec: containers: - name: nginx image: registry.cn-beijing.aliyuncs.com/mrvolleyball/nginx:v1 imagePullPolicy: Always --- apiVersion: v1 kind: Service metadata: name: nginx-service spec: selector: app: image-update ports: - protocol: TCP port: 10080 targetPort: 80简单验证一下：
root@k8s-master:~# kubectl apply -f image_update.yaml deployment.extensions "image-deployment" created service "nginx-service" created root@k8s-master:~# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx-service ClusterIP 10.254.240.225 <none> 10080/TCP 1m root@k8s-master:~# kubectl get pod -owide NAME READY STATUS RESTARTS AGE IP NODE image-deployment-58b646ffb6-d4sl7 1/1 Running 0 1m 10.10.169.131 k8s-node2 root@k8s-master:~# curl :10080 ---------- version: v1 hostname: image-deployment-58b646ffb6-d4sl7已经正常工作了，并且当前版本是v1
下面介绍修改镜像的方法
（1）修改配置文件这应该是最常用的方法了
修改配置文件，将nginx:v1改成nginx:v2：
root@k8s-master:~# sed -i 's/nginx:v1/nginx:v2/g' image_update.yaml应用配置文件：
root@k8s-master:~# kubectl apply -f image_update.yaml deployment.extensions "image-deployment" configured service "nginx-service" unchanged root@k8s-master:~# kubectl get pod -owide NAME READY STATUS RESTARTS AGE IP NODE image-deployment-55cb946d47-7tzp8 0/1 ContainerCreating 0 16s <none> k8s-node1 image-deployment-58b646ffb6-d4sl7 1/1 Terminating 0 11m 10.10.169.131 k8s-node2等待一段时间之后，v2版本ready之后
root@k8s-master:~# kubectl get pod -owide NAME READY STATUS RESTARTS AGE IP NODE image-deployment-55cb946d47-7tzp8 1/1 Running 0 1m 10.10.36.119 k8s-node1 root@k8s-master:~# curl :10080 ---------- version: v2 hostname: image-deployment-55cb946d47-7tzp8成功更新为v2
（2）使用patch命令首先找到deployment：
root@k8s-master:~# kubectl get deploy NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE image-deployment 1 1 1 1 20m通过patch更新：
root@k8s-master:~# kubectl patch deployment image-deployment --patch '{"spec": {"template": {"spec": {"containers": [{"name": "nginx","image":"registry.cn-beijing.aliyuncs.com/mrvolleyball/nginx:v1"}]}}}}' deployment.extensions "image-deployment" patched等待一段时间之后：
root@k8s-master:~# curl :10080 ---------- version: v1 hostname: image-deployment-58b646ffb6-hbzk9通过patch更新之后，镜像版本更新回v1
（3）使用set image命令使用set image命令将镜像版本更新到v2
root@k8s-master:~# kubectl set image deploy image-deployment *=registry.cn-beijing.aliyuncs.com/mrvolleyball/nginx:v2 root@k8s-master:~# curl :10080 ---------- version: v2 hostname: image-deployment-55cb946d47-zsdc6等待一段时间之后，版本又更新到v2