Oracle Linux 7.9内核降级

OL7.9内核降级

1、查看当前OS版本号：

# cat /etc/oracle-release 
Oracle Linux Server release 7.9
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2、查看当前内核版本号：

# uname -r
5.4.17-2011.6.2.el7uek.x86_64

# cat /proc/version
Linux version 5.4.17-2011.6.2.el7uek.x86_64 (mockbuild@jenkins-172-17-0-2-64d560bf-4b94-4bde-a5f8-f55888be27a0) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39.0.3) (GCC)) #2 SMP Thu Sep 3 14:09:14 PDT 2020
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3、查看已安装内核rpm包版本：

# rpm -qa|grep kernel
kernel-3.10.0-1160.el7.x86_64
kernel-headers-3.10.0-1160.el7.x86_64
kernel-uek-5.4.17-2011.6.2.el7uek.x86_64
kernel-tools-3.10.0-1160.el7.x86_64
kernel-tools-libs-3.10.0-1160.el7.x86_64
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4、下载对应版本内核rpm升级包：

Linux7 网址：Oracle Linux 7 (x86_64) UEK Release 6 | Oracle, Software. Hardware. Complete.

Linux6 网址：Oracle Linux 6 (x86_64) UEK Release 4 | Oracle, Software. Hardware. Complete.

kernel-uek-firmware-4.1.12-124.63.3.1.el7uek.noarch
kernel-uek-devel-4.1.12-124.63.3.1.el7uek.x86_64
kernel-uek-4.1.12-124.63.3.1.el7uek.x86_64
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5、使用rpm命令对内核进行降级：

rpm -Uvh --oldpackage kernel-uek-4.1.12-124.63.3.1.el7uek.x86_64.rpm kernel-uek-devel-4.1.12-124.63.3.1.el7uek.x86_64.rpm kernel-uek-firmware-4.1.12-124.63.3.1.el7uek.noarch.rpm
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输出如下：

warning: kernel-uek-4.1.12-124.63.3.1.el7uek.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:kernel-uek-firmware-4.1.12-124.63################################# [ 25%]
   2:kernel-uek-4.1.12-124.63.3.1.el7u################################# [ 50%]
   3:kernel-uek-devel-4.1.12-124.63.3.################################# [ 75%]
Cleaning up / removing...
   4:kernel-uek-5.4.17-2011.6.2.el7uek################################# [100%]

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可能需要依赖，手动安装rpm -ivh libdtrace-ctf-0.7.0-1.el7.x86_64.rpm

6、检查启动项：

awk -F\' '$1=="menuentry " {print i++ " : " $2}'  /boot/grub2/grub.cfg
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0 : Oracle Linux Server 7.9, with Unbreakable Enterprise Kernel 4.1.12-124.63.3.1.el7uek.x86_64
1 : Oracle Linux Server (3.10.0-1160.el7.x86_64 with Linux) 7.9
2 : Oracle Linux Server (0-rescue-3dafeec3c07441df8c55b32fa245d20e with Linux) 7.9
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7、选择启动项：

grub2-set-default 0
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8、重启操作系统：

shutdown -r now
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