1.加载秘钥：rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

2.安装elrepo：rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

3.加载数据：yum --disablerepo=* --enablerepo=elrepo-kernel repolist

4.查看可用包：yum --disablerepo=* --enablerepo=elrepo-kernel list kernel*

5.安装最新内核：yum --disablerepo=* --enablerepo=elrepo-kernel install -y kernel-ml.x86_64

6.查看默认内核启动顺序：awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg

7.设置为0：grub2-set-default 0

8.删除旧内核（可选）：

rpm -qa|grep kernel|grep 3.10
rpm -qa|grep kernel|grep 3.10|xargs yum remove -y

9.重启查看：reboot、uname -r