1、導入密鑰
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2、添加庫
# Centos 7
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
# Centos 6
rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
3、更新核心
yum --enablerepo=elrepo-kernel install kernel-ml
4、查詢所有核心清單
# Centos 7
grep -oP "(?<=^menuentry \')[^\']+" /etc/grub2.cfg
# 或者
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
# Centos 6
grep -oP '(?<=title ).*' /boot/grub/grub.conf
5、修改預設啟動核心
# Centos 7
grub2-set-default "CentOS Linux (4.12.4-1.el7.elrepo.x86_64) 7 (Core)"
# 或者
grub2-set-default 0
# Centos 6
sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf
reboot
uname -r