6.6. 在更新失败后恢复

流程

1. 启动恢复操作：

   # snapm snapset revert before-upgrade
     Delaying merge since origin is open.
     Merging of snapshot rhel/root-snapset_before-upgrade_1745441237_- will occur on next activation of rhel/root.
     Delaying merge since origin is open.
     Merging of snapshot rhel/var-snapset_before-upgrade_1745441237_-var will occur on next activation of rhel/var.
   WARNING - Snaphot set before-upgrade is in use: reboot required to complete revert
   WARNING - Boot into 'Revert before-upgrade 2025-04-23 21:47:17 (5.14.0-558.el9.x86_64)' to continue

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   警告

   恢复快照集后，您必须继续此流程中的所有剩余步骤，以防止数据丢失。

2. 重启机器以恢复操作系统状态：

   # reboot

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3. 从 GRUB 屏幕中选择 Revert 引导条目。当系统卷处于活跃状态时，系统会自动启动快照恢复操作。

   重要

   当合并操作启动时，快照卷不再可用。启动恢复操作会自动删除快照引导条目。

4. 完成合并操作后，删除不用的条目：

   # rm -f /boot/loader/entries/*.el10*

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   # rm -f /boot/*.el10*

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5. 成功恢复系统后，使用 boom 命令删除恢复引导条目：

   # boom list -o+title
   BootID  Version                  Name                     RootDevice            Title
   34d576e 5.14.0-546.el9.x86_64    Red Hat Enterprise Linux /dev/mapper/rhel-root Red Hat Enterprise Linux (5.14.0-546.el9.x86_64) 9.6 (Plow)
   b737685 5.14.0-558.el9.x86_64    Red Hat Enterprise Linux /dev/mapper/rhel-root Red Hat Enterprise Linux (5.14.0-558.el9.x86_64) 9.6 (Plow)
   6703c58 5.14.0-558.el9.x86_64    Red Hat Enterprise Linux /dev/rhel/root        Revert before-upgrade 2025-04-23 21:47:17 (5.14.0-558.el9.x86_64)

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   # boom delete 6703c58
   Deleted 1 entry

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