(資料圖片僅供參考)

回滾到之前的版本

如果我們想要回滾到之前的某個(gè)版本，我們可以使用以下命令查看Deployment的更新歷史記錄：

kubectl rollout history deployment/nginx-deployment

這將輸出類似于以下內(nèi)容的信息：

deployment.apps/nginx-deployment REVISION  CHANGE-CAUSE1         kubectl create -f nginx-deployment.yaml --record=true2         kubectl set image deployment/nginx-deployment nginx=nginx:1.17 --record=true3         kubectl set image deployment/nginx-deployment nginx=nginx:1.16 --record=true

我們可以看到Deployment共進(jìn)行了3次滾動(dòng)更新，我們可以回滾到任意一個(gè)版本。假設(shè)我們想要回滾到步驟3：回滾Deployment

如果新版本出現(xiàn)問(wèn)題，您需要快速回滾Deployment。Deployment提供了回滾機(jī)制，可以使您快速回到先前的穩(wěn)定版本。回滾Deployment會(huì)自動(dòng)啟動(dòng)Rollback操作，它會(huì)撤消Deployment中的所有更改，并將其回滾到先前的版本?；貪L將不斷重試，直到所有Pod都達(dá)到先前的版本。

在我們的示例中，我們將回滾Deployment以將它恢復(fù)到早期版本。

檢查Deployment狀態(tài)：

$ kubectl rollout status deployment hello-deployment

回滾Deployment：

$ kubectl rollout undo deployment hello-deployment

檢查回滾狀態(tài)：

$ kubectl rollout status deployment hello-deployment

輸出：

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

您可以看到回滾Deployment后，狀態(tài)已恢復(fù)到早期版本。

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