https://github.com/databus23/helm-diff

如果我們在做 Helm upgrade 的話，可能會想知道舊 Revision 和新的 Revision 有什麼差異，讓我知道接下來會有什麼變更，這時候就可以用到 Helm Diff Plugin

安裝 Helm Diff

執行以下指令：

helm plugin install <https://github.com/databus23/helm-diff>

如何使用

其實就是在原本的 helm upgrade 前面加上 diff 而已：

helm diff upgrade $RELEASE_NAME $CHART_DIR --namespace $NAMESPACE --values values.yaml || true

附上一些 Uage:

Usage:
  diff [flags]
  diff [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  release     Shows diff between release's manifests
  revision    Shows diff between revision's manifests
  rollback    Show a diff explaining what a helm rollback could perform
  upgrade     Show a diff explaining what a helm upgrade would change.
  version     Show version of the helm diff plugin