红帽全球峰会第 1 章 undercloud 和 control plane 简介备份和恢复
Undercloud 和 Control Plane Back Up 和 Restore 过程提供了备份 Red Hat OpenStack Platform 13 undercloud 和 overcloud Controller 节点（在更新和升级前称为 Control Plane 节点）的步骤。如果在更新或升级过程中出现错误，请使用流程将 undercloud 和 overcloud Control Plane 节点恢复到以前的状态。
1.1. 背景信息
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Undercloud 和 Control Plane Back Up 和 Restore 过程使用开源 Relax 和 Recover (ReaR)灾难恢复解决方案，以 Bash 编写。ReaR 创建由 undercloud 或 Control Plane 节点的最新状态组成的可引导镜像。ReaR 还可让系统管理员选择用于备份的文件。
ReaR 支持大量引导介质格式，包括：
- ISO
- USB
- eSATA
- PXE
本文档中的示例使用 ISO 引导格式进行测试。
ReaR 可使用多个协议传输引导镜像，包括：
- HTTP/HTTPS
- SSH/SCP
- FTP/SFTP
- NFS
- CIFS (SMB)
为了备份和恢复 Red Hat OpenStack Platform 13 undercloud 和 overcloud Control Plane 节点，本文档中的示例是使用 NFS 进行测试。
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