centos 7升级内核

   28  uname -a
   29  cat /etc/redhat-release
   30  rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
   31  rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
   32  yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
   33  yum -y --enablerepo=elrepo-kernel install kernel-lt
   34  sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
   35  grub2-set-default 0
   36  grub2-mkconfig -o /boot/grub2/grub.cfg
   37  reboot
   41  uname -a

 现在elrepo源已经没有内核软件了，可以去http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/下载

安装后，然后执行34行以下命令