k8s用kubectl管理应用升级，服务发布与回滚，扩缩容

应用升级

Kubectl set image --help 有案例指定新版本

[root@k8s-master ~]# kubectl set image deployment/nginx nginx=nginx:1.11

升级之后他会将所有版本进行替换，用describe来查看版本

[root@k8s-master ~]# kubectl get pods

NAME READY STATUS RESTARTS AGE

busybox-5d4f595646-dzjv4 1/1 Running 0 2d

nginx-76c4c6d6d8-5w825 1/1 Running 0 2m

nginx-76c4c6d6d8-bh2sm 1/1 Running 0 2m

nginx-76c4c6d6d8-cwhw5 1/1 Running 0 1m

用describe来查看版本，看到版本已经升级为1.11版本了，另外下面还有他的输出信息

[root@k8s-master ~]# kubectl describe po/nginx-76c4c6d6d8-cwhw5

nginx:

Container ID: docker://ca046dd27d86bc10f330131be7ba5b91b14cb555c5d9677bb23f481e4e69aa67

Image: nginx:1.11

第二种修改应用版本===可以使用edit

直接进行编辑就行

[root@k8s-master ~]# kubectl edit deploy/nginx

找到image直接修改进行保存，升级之后他会将所有版本进行替换，用describe来查看版本

等启动之后查看pod重启新的镜像已经运行了

[root@k8s-master ~]# kubectl get pods

NAME READY STATUS RESTARTS AGE

busybox-5d4f595646-dzjv4 1/1 Running 0 2d

nginx-7454cd89d8-fpncj 1/1 Running 0 5m

nginx-7454cd89d8-gdz8c 1/1 Running 0 4m

nginx-7454cd89d8-tlngj 1/1 Running 0 5m

用describe查看Pod镜像信息

[root@k8s-master ~]# kubectl describe po/nginx-7454cd89d8-tlngj

nginx:

Container ID: docker://6768df2391defe44097e3ce2a857529ec614d49962181c1cf541c1bbc6dbce08

Image: nginx:1.15

用node端直接访问查看版本

[root@k8s-node1 ~]# curl -I 10.10.10.173:88

HTTP/1.1 200 OK

Server: nginx/1.15.12

Date: Mon, 08 Jul 2019 04:23:42 GMT

查看版本升级信息

[root@k8s-master ~]# kubectl rollout history deploy/nginx

deployments "nginx"

REVISION CHANGE-CAUSE

1 <none>

2 <none>

3 <none>

记录版本信息状态，便于回滚

[root@k8s-master ~]# kubectl set image deployment/nginx nginx=nginx:1.16 --record

[root@k8s-master ~]# kubectl rollout history deploy/nginx

deployments "nginx"

REVISION CHANGE-CAUSE

1 <none>

2 <none>

3 <none>

4 kubectl set image deployment/nginx nginx=nginx:1.16 --record=true

进行回滚用rollout undo，默认恢复到上一个版本也就是1.15

[root@k8s-master ~]# kubectl rollout undo deploy/nginx

默认少一个3,也就是回到上次第三次版本了

[root@k8s-master ~]# kubectl rollout history deploy/nginx

deployments "nginx"

REVISION CHANGE-CAUSE

1 <none>

2 <none>

4 kubectl set image deployment/nginx nginx=nginx:1.16 --record=true

5 <none>

[root@k8s-master ~]# kubectl describe po/nginx-7454cd89d8-txjpm

Containers:

nginx:

Container ID: docker://f17b88c301d61b8c75a46cba84d97c285f5d61886c081b3cfc9c0668e5cbf4e3

Image: nginx:1.15

业务量突然增加，我们需要增加副本

[root@k8s-master ~]# kubectl scale deploy/nginx --replicas=10

deployment "nginx" scaled

[root@k8s-master ~]# kubectl get pod

NAME READY STATUS RESTARTS AGE

busybox-5d4f595646-dzjv4 1/1 Running 0 2d

nginx-7454cd89d8-4cct8 1/1 Running 0 19s

nginx-7454cd89d8-75tvg 1/1 Running 0 7m

nginx-7454cd89d8-7v5qp 1/1 Running 0 1m

nginx-7454cd89d8-dtsgq 1/1 Running 0 19s

nginx-7454cd89d8-hjcpw 1/1 Running 0 7m

nginx-7454cd89d8-mhhww 1/1 Running 0 19s

nginx-7454cd89d8-txjpm 1/1 Running 0 7m

nginx-7454cd89d8-vkmjn 1/1 Running 0 19s

nginx-7454cd89d8-z8dbn 1/1 Running 0 19s

nginx-7454cd89d8-zn8pm 1/1 Running 0 1m

业务量下降我们进行缩容

[root@k8s-master ~]# kubectl scale deploy/nginx --replicas=5

[root@k8s-master ~]# kubectl get pod

NAME READY STATUS RESTARTS AGE

busybox-5d4f595646-dzjv4 1/1 Running 0 2d

nginx-7454cd89d8-75tvg 1/1 Running 0 8m

nginx-7454cd89d8-7v5qp 1/1 Running 0 3m

nginx-7454cd89d8-hjcpw 1/1 Running 0 8m

nginx-7454cd89d8-txjpm 1/1 Running 0 8m

nginx-7454cd89d8-zn8pm 1/1 Running 0 3m

要是不需要这些资源或者换项目了

直接用delete=======删除deploy还有service

[root@k8s-master ~]# kubectl delete deploy/nginx

deployment "nginx" deleted

[root@k8s-master ~]# kubectl delete svc/nginx-service

查看资源已经删除

[root@k8s-master ~]# kubectl get all