红帽全球峰会第 5 章 准备 overcloud 升级
本节为升级过程准备 overcloud。并非本节中的所有步骤都将适用于您的 overcloud。但是，建议逐一执行以下步骤，并确定您的 overcloud 是否需要在升级过程开始前是否需要额外的配置。
5.1. 准备 overcloud 服务停机
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overcloud 升级过程会禁用主服务在关键点上。这意味着您无法在升级过程中使用任何 overcloud 服务来创建新资源。在 overcloud 中运行的工作负载在此期间保持活跃状态，这意味着实例在升级期间继续运行。
规划维护窗口非常重要，以确保用户在升级过程中无法访问 overcloud 服务。
受 overcloud 升级的影响
- OpenStack Platform 服务
不受 overcloud 升级的影响
- 在升级过程中运行的实例
- Ceph Storage OSD （实例的后端存储）
- Linux 网络
- Open vSwitch 网络
- undercloud
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