CentOS7修改默认启动内核

查看当前启动内核

[root@test ~]# uname -sr
Linux 3.10.0-1160.el7.x86_64

查看当前默认启动内核

[root@test ~]# grub2-editenv list
saved_entry=CentOS Linux (3.10.0-1160.62.1.el7.x86_64) 7 (Core)

确认系统内当前已安装内核版本

[root@test ~]# cat /boot/grub2/grub.cfg | grep -v rescue | grep ^menuentry
menuentry 'CentOS Linux (3.10.0-1160.62.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.62.1.el7.x86_64-advanced-b9022f38-aad0-4a21-8040-608df378f6f2' {
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-b9022f38-aad0-4a21-8040-608df378f6f2' {

[root@test ~]# rpm -qa kernel
kernel-3.10.0-1160.el7.x86_64
kernel-3.10.0-1160.62.1.el7.x86_64

设置默认启动内核

[root@test ~]# grub2-set-default 'CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)'
[root@test ~]# grub2-editenv list
saved_entry=CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)