linux操作系统内核升级

1。mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum clean all # 清除系统所有的yum缓存
yum makecache # 生成yum缓存
yum update


rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm


awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

yum --disablerepo="*" --enablerepo="elrepo-kernel" list available


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


vi /etc/default/grub
#GRUB_DEFAULT=saved
GRUB_DEFAULT=0

grub2-mkconfig -o /boot/grub2/grub.cfg