红帽全球峰会7.2. 选择 Compute 节点进行升级测试
Overcloud 升级过程允许您：
- 升级角色中的所有节点
- 独立节点
为确保 overcloud 平稳升级过程，在升级所有 Compute 节点前，对环境中几个单独 Compute 节点的升级很有用。这样可保证在升级过程中不会发生重大问题，同时保持到工作负载的停机时间。
使用以下建议来帮助选择测试节点进行升级：
- 选择两个或三个 Compute 节点以升级测试
- 选择没有运行任何关键实例的节点
- 如有必要，将关键实例从所选测试 Compute 节点迁移到其他 Compute 节点
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