红帽全球峰会第 2 章 备份 control plane 节点
要备份 control plane 节点，请配置备份节点，在 control plane 节点上安装 Relax-and-Recover 工具，并创建备份镜像。您可以将备份创建作为常规环境维护的一部分。
在执行更新或升级前，您必须备份 control plane 节点。如果在更新或升级过程中出现错误，您可以使用备份将 control plane 节点恢复到之前的状态。您还可以作为常规环境维护的一部分创建备份。
2.1. 支持的备份格式和协议
undercloud 和备份和恢复过程使用开源工具 Relax-and-Recover (ReaR)来创建和恢复可引导的备份镜像。ReaR 使用 Bash 编写，支持多种镜像格式和多个传输协议。
以下列表显示了 Red Hat OpenStack Platform 支持的备份格式和协议。
- 可引导介质格式
- ISO
- 文件传输协议
- SFTP
- NFS
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