CentOS 8/7/6 安装最新内核并自动卸载多余内核

#导入key
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

#添加源
#CentOS 8
yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
#CentOS 7
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
#CentOS 6
yum install https://www.elrepo.org/elrepo-release-6.el6.elrepo.noarch.rpm

#安装内核
yum --enablerepo=elrepo-kernel -y install kernel-ml
#卸载原版内核headers
yum remove -y kernel-headers
#安装新内核headers
yum --enablerepo=elrepo-kernel -y install kernel-ml-headers
#安装内核devel
yum --enablerepo=elrepo-kernel -y install kernel-ml-devel

#更新引导
#CentOS 7/8
grub2-set-default 0
#CentOS 6
sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf
#重启应用新内核
reboot
#卸载多余内核
yum remove $(rpm -qa | grep kernel | grep -v $(uname -r))

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