一、CentOS 7.9 升级内核 kernel-ml-5.6.14版本
地址
http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS
默认内核版本为3.10.0，现升级到 5.6.14 版本
查看当前内核版本
[root@localhost ~]# uname -r
3.10.0-1160.53.1.el7.x86_64
wget 下载
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-5.6.14-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-5.6.14-1.el7.elrepo.x86_64.rpm安装
[root@ecs-65685 ~]# rpm -ivh kernel-ml-5.6.14-1.el7.elrepo.x86_64.rpm
warning: kernel-ml-5.6.14-1.el7.elrepo.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID baadae52: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:kernel-ml-5.6.14-1.el7.elrepo ################################# [100%]
[root@ecs-65685 software]# rpm -ivh kernel-ml-devel-5.6.14-1.el7.elrepo.x86_64.rpm
warning: kernel-ml-devel-5.6.14-1.el7.elrepo.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID baadae52: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:kernel-ml-devel-5.6.14-1.el7.elre################################# [100%]查看当前内核
[root@ecs-65685 ~]# cat /boot/grub2/grub.cfg |grep ^menuentry
menuentry 'CentOS Linux (5.6.14-1.el7.elrepo.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-f5954a19-b069-42e4-a6ca-3a1cd06d0735' {
menuentry 'CentOS Linux (3.10.0-1160.53.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-f5954a19-b069-42e4-a6ca-3a1cd06d0735' {
menuentry 'CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-f5954a19-b069-42e4-a6ca-3a1cd06d0735' {
menuentry 'CentOS Linux (0-rescue-acca19161ce94d449c58923b12797030) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-acca19161ce94d449c58923b12797030-advanced-f5954a19-b069-42e4-a6ca-3a1cd06d0735' {设置启动内核
[root@ecs-65685 ~]# grub2-set-default 0
# 或者
grub2-set-default 'CentOS Linux (5.6.14-1.el7.elrepo.x86_64) 7 (Core)'重新生成一个grub2配置文件
[root@ecs-65685 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.6.14-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-5.6.14-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.53.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.53.1.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-acca19161ce94d449c58923b12797030
Found initrd image: /boot/initramfs-0-rescue-acca19161ce94d449c58923b12797030.img
done重启系统
[root@ecs-65685 ~]# reboot确认下是否启动默认内核指向上面安装的内核
[root@ecs-65685 ~]# grubby --default-kernel
/boot/vmlinuz-5.6.14-1.el7.elrepo.x86_64确认使用的内核版本
uname -r
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