回滚到之前的版本
如果我们想要回滚到之前的某个版本，我们可以使用以下命令查看Deployment的更新历史记录：
代码语言：javascript复制kubectl rollout history deployment/nginx-deployment这将输出类似于以下内容的信息：
代码语言：javascript复制deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
1 kubectl create -f nginx-deployment.yaml --record=true
2 kubectl set image deployment/nginx-deployment nginx=nginx:1.17 --record=true
3 kubectl set image deployment/nginx-deployment nginx=nginx:1.16 --record=true我们可以看到Deployment共进行了3次滚动更新，我们可以回滚到任意一个版本。假设我们想要回滚到步骤3：回滚Deployment
如果新版本出现问题，您需要快速回滚Deployment。Deployment提供了回滚机制，可以使您快速回到先前的稳定版本。回滚Deployment会自动启动Rollback操作，它会撤消Deployment中的所有更改，并将其回滚到先前的版本。回滚将不断重试，直到所有Pod都达到先前的版本。
在我们的示例中，我们将回滚Deployment以将它恢复到早期版本。
检查Deployment状态：
代码语言：javascript复制$ kubectl rollout status deployment hello-deployment回滚Deployment：
代码语言：javascript复制$ kubectl rollout undo deployment hello-deployment检查回滚状态：
代码语言：javascript复制$ kubectl rollout status deployment hello-deployment输出：
代码语言：javascript复制Waiting for deployment "hello-deployment" rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for deployment "hello-deployment" rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for deployment "hello-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "hello-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
deployment "hello-deployment" successfully rolled out您可以看到回滚Deployment后，状态已恢复到早期版本。
