寻找需要的版本

nginx-ingress地址：https://github.com/kubernetes/ingress-nginx/releases?page=16

• 在浏览器上打开上面的地址
  

• 复制quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.31.0
  (本次演示把quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0升级为quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.31.0)

查看nginx-ingress-controller本地版本

#滚动更新是deployment特有的功能
#查看本地版本
[root@master ~]# kubectl get deploy -n ingress-nginx -o wide
NAME                       READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS                 IMAGES                                                                  SELECTOR
nginx-ingress-controller   1/1     1            1           118d   nginx-ingress-controller   quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0   app.kubernetes.io/name=ingress-nginx,app.kubernetes.io/part-of=ingress-nginx

可以看到当前镜像为quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0

滚动更新

#将quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0  升级到quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.31.0
[root@master ~]# kubectl set image deployment nginx-ingress-controller nginx-ingress-controller=quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.31.0 -n ingress-nginx
deployment.apps/nginx-ingress-controller image updated

#查看是否更新
[root@master ~]# kubectl get deploy -n ingress-nginx -o wide
NAME                       READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS                 IMAGES                                                                  SELECTOR
nginx-ingress-controller   1/1     1            1           118d   nginx-ingress-controller   quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.31.0   app.kubernetes.io/name=ingress-nginx,app.kubernetes.io/part-of=ingress-nginx
#查看pods是否启动成功
[root@master tomcat]# kubectl get pods -n ingress-nginx -o wide
NAME                                        READY   STATUS        RESTARTS   AGE   IP             NODE    NOMINATED NODE   READINESS GATES
nginx-ingress-controller-79c6646675-dh5sh   1/1     Running       0          13s   10.244.2.181   node2   <none>           <none>
nginx-ingress-controller-7f74f657bd-nhtvn   1/1     Terminating   0          25m   10.244.2.180   node2   <none>           <none>

版本回退

如果升级过后pod一直启动不了就需要回退版本

# 查看当前升级版本的状态
[root@k8s-master ~]# kubectl rollout status deploy nginx-ingress-controller -n ingress-nginx
deployment "dep" successfully rolled out
 
# 查看升级历史记录
[root@k8s-master ~]# kubectl rollout history deploy nginx-ingress-controller -n ingress-nginx
deployment.apps/dep
REVISION  CHANGE-CAUSE
1         kubectl create --filename=dep.yaml --record=true
2         kubectl create --filename=dep.yaml --record=true
3         kubectl create --filename=dep.yaml --record=true
# 可以发现有三次版本记录，说明完成过两次升级
 
# 版本回滚
# 使用--to-revision=1回滚到了1版本
[root@node1 ~]#  kubectl rollout undo deployment nginx-ingress-controller --to-revision=1 -n ingress-nginx
deployment.apps/nginx-ingress-controller rolled back

 
# 查看发现，通过nginx镜像版本可以发现到了第一版
[root@master ~]# kubectl get deploy -n ingress-nginx -o wide
NAME                       READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS                 IMAGES                                                                  SELECTOR
nginx-ingress-controller   1/1     1            1           118d   nginx-ingress-controller   quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0   app.kubernetes.io/name=ingress-nginx,app.kubernetes.io/part-of=ingress-nginx