CentOS7.x系统内核升级到最新版

yum update

sh upgradekernel.sh

#!/bin/bash

clear;

function upgradeYum()
{
    yum clean all;
    yum update -y;
    reboot;
}

function upgradeKernel()
{
    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;
    yum --disablerepo="*" --enablerepo="elrepo-kernel" list available;
    yum --enablerepo=elrepo-kernel install -y kernel-ml;
    grub2-mkconfig -o /boot/grub2/grub.cfg;
    grub2-editenv list;
    awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg;
    echo -n  "请输入最新的内核编号 ->";
    read  num;
    grub2-set-default $num;
    grub2-editenv list;
}

function confirmKernel()
{
    echo -n  "确定内核与输入的对应吗? 如果是请输入(y),否则输入(n) ->";
    read confirmInput;
    if [ "$confirmInput" == 'y' ]; then
        reboot;
    elif [ "$selected" == 'n' ]; then
        exit;
    else
        confirmKernel;
        return;
    fi;
}

function removeOldKernel()
{
    IFS=$'\n';
    for LINE in `rpm -qa | grep kernel- | grep 3.`; do
        yum -y remove ${LINE};
    done;
    reboot;
}

function checkSystem()
{
    cat /etc/redhat-release;
    uname -sr;
    uname -a;
    echo "[Notice] Confirm Upgrade Kernel? please select: (1~4)"
    select selected in '执行yum update输入1' '升级内核请输入2' '删除旧的内核' 'Exit'; do break; done;
    [ "$selected" == 'Exit' ] && echo 'Exit Upgrade.' && exit;
    if [ "$selected" == '执行yum update输入1' ]; then
        upgradeYum;
    elif [ "$selected" == '升级内核请输入2' ]; then
        upgradeKernel;
        confirmKernel;
    elif [ "$selected" == '删除旧的内核' ]; then
        removeOldKernel;
    else
        ConfirmInstall;
        return;
    fi;
    echo "[OK] You Selected: ${selected}";
}

checkSystem;