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Update rollingupdateWithZeroDowntime.md

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无痴迷，不成功 2018-04-11 07:35:32 -07:00 committed by GitHub
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@ -23,15 +23,14 @@ $ kubectl get pods -n k8s-ecoysystem-apps
通过pod描述，查看应用程序的当前映像版本
$ kubectl describe pods -n k8s-ecoysystem-apps
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410154409814-1314131317.png)
![](../../pics/prePublish.png)
```javascript
升级镜像版本到v2.3
$ kubectl -n k8s-ecoysystem-apps set image deployments/helloworldapi helloworldapi=registry.wuling.com/justmine/helloworldapi:v2.3
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410154935764-1314470605.png)
![](../../pics/postPublish.png)
### 4.2. 验证发布
```javascript
@ -41,14 +40,15 @@ kubectl -n k8s-ecoysystem-apps rollout status deployments/helloworldapi
kubectl describe pods -n k8s-ecoysystem-apps
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410160924346-999250417.png)
![](../../pics/validatePublish.png)
从上图可以看到，镜像已经升级到v2.3版本
### 4.3. 回滚发布
```javascript
kubectl -n k8s-ecoysystem-apps rollout undo deployments/helloworldapi
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410162257177-338903127.png)
![](../../pics/rollbackPublish.png)
到目前为止，整个滚动发布工作就圆满完成了！！！
**那么如果我们想回滚到指定版本呢？答案是k8s完美支持，并且还可以通过资源文件进行配置保留的历史版次量**。由于篇幅有限，感兴趣的朋友，可以自己下去实战，回滚命令如下：
@ -66,10 +66,10 @@ k8s精确地控制着整个发布过程，分批次有序地进行着滚动更
kubectl -n k8s-ecoysystem-apps get deployment helloworldapi -o yaml
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410174631074-750818831.png)
![](../../pics/publishDefaulConfig.png)
### 5.1. 浅析部署概况
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410164244911-1200541035.png)
![](../../pics/theory-dep-summary.png)
>* `DESIRED`   最终期望处于READY状态的副本数  
>* `CURRENT` 当前的副本总数
@ -83,7 +83,7 @@ kubectl -n k8s-ecoysystem-apps get deployment helloworldapi -o yaml
```javascript
kubectl -n k8s-ecoysystem-apps describe deployment helloworldapi
```
![](https://images2018.cnblogs.com/blog/1082769/201804/1082769-20180410171712425-955953191.png)
![](../../pics/theory-dep-detail.png)
整个滚动过程是通过控制两个副本集来完成的，新的副本集：helloworldapi-6564f59f66；旧的副本集：helloworldapi-6f4959c8c7 。
理想状态下的滚动过程：