centos7 内核升级

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

2. rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
3.yum --enablerepo=elrepo-kernel install kernel-lt -y  

或者yum --enablerepo=elrepo-kernel install kernel-ml -y

4.vim /etc/grub.conf

5. reboot