【转自MOS文章】升级到Oracle Linux 7.5之后无法启动操作系统

转自：

rubby 8.28: Unbootable System After Upgrade to Oracle Linux 7.5 (文档 ID 2388490.1)

Applies to:

Linux OS - Version Oracle Linux 7.4 to Oracle Linux 7.4 [Release OL7U4]
Linux x86-64

Symptoms

grubby 8.28: unbootable system after Oracle Linux7.5 upgrade.

Changes

Oracle Linux 7.5 upgrade from Oracle Linux 7.4

Cause

Upgrading Oracle Linux 7.4 to Oracle Linux 7.5 with yum update results in unbootable system due to missing initrd16 entry in /boot/grub2/grub.cfg

To reproduce:

- Start with a (minimal) OracleLinux7.4,UEK4 only (no RHCK),kernel NOT up-to-date
- Run yum update
- Verify /boot/grub2/grub.cfg,initrd16 is missing

Solution

Workaround to avoid the problem.

- Proactive: Upgrade kernel before migrating to OracleLinux7.5 (yum update kernel-uek)

（编辑：李大同）

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