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环境：
CentOS Linux release 7.6.1810 (Core) ；
1.查看当前默认启动内核
[inspur@localhost ~]$ grub2-editenv list grub2-editenv: error: cannot open `/boot/grub2/grubenv.new': Permission denied. [inspur@localhost ~]$ sudo grub2-editenv list [sudo] password for inspur: saved_entry=CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core) [inspur@localhost ~]$
查看所有内核
[inspur@localhost ~]$ sudo cat /boot/grub2/grub.cfg | grep menuentryif [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
menuentry_id_option=""
export menuentry_id_option
menuentry 'CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-862.el7.x86_64-advanced-1ef88ad8-4275-4ceb-9d7f-80abefd6a4c2' {
menuentry 'CentOS Linux (3.10.0-862.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-862.el7.x86_64-advanced-1ef88ad8-4275-4ceb-9d7f-80abefd6a4c2' {
menuentry 'CentOS Linux (0-rescue-396035e748534ed49bfde6ab589c7cbe) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-396035e748534ed49bfde6ab589c7cbe-advanced-1ef88ad8-4275-4ceb-9d7f-80abefd6a4c2' {
[inspur@localhost ~]$3.设置新的启动内核
[inspur@localhost ~]$ sudo grub2-set-default 'CentOS Linux (3.10.0-862.el7.x86_64) 7 (Core)' [inspur@localhost ~]$
4.验证启动内核
[inspur@localhost ~]$ sudo grub2-editenv list saved_entry=CentOS Linux (3.10.0-862.el7.x86_64) 7 (Core) [inspur@localhost ~]$
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