如果通过将VM缩放比例设置为1来缩小集群规模，则基本上是在破坏集群，因为根据设计，它至少需要3个节点.因此，唯一的方法是从头开始重新创建它.

If you are scaling down the cluster by resizing VM scale set to 1 you're basically destroying the cluster because it requires a minimum of 3 nodes by design. Therefore the only way is to recreate it again from scratch.

如果您需要一个仅包含1个节点的小型群集(例如出于测试目的)，Azure中现在可以创建一个单节点群集，但是您无法对其进行扩展，因为这是一种特殊情况供生产使用.

If you need a tiny cluster consisting of just 1 node (like for testing purposes) there is a way in Azure now to create a single node cluster, but you won't be able to scale it as it's a special case not for production use.