【玩转腾讯云】腾讯云CentOS 7.6升级内核到最新操作(附自动化Shell脚本)

#!/bin/bash
#
# Title: CentOS7.6_x64_upgrade_kernel_script
# Author: ZNing
# Date: 2019-7-3 23:13:09
# Pass on the Tencent Cloud CentOS7.6 x64
# You should run this script three times. The first is yum update, the second is kernel upgrade to 5, the final one is optional when you decided to maunal which is deleting old kernel.
# Having fun to using it. (*^▽^*) Best wishes from Misaka Mikoto and Misaka 10086. 

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  "please enter the latest kernel number ->";
    read  num;
    grub2-set-default $num;
    grub2-editenv list;
}

function confirmKernel()
{
    echo -n  "are the kernel changed? If it is, plz input(y),else(n) ->";
    read confirmInput;
    if [ "$confirmInput" == 'y' ]; then
		reboot;
	elif [ "$selected" == 'n' ]; then
		exit;
	else
		confirmKernel;
		return;
	fi;
}

function removeOldKernel()
{
    IFS=$'\n';
    for LINE in `rpm -qa | grep kernel- | grep 3.`; do
        #Do some works on "${LINE}"
        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 'Upgrade Step 1' 'Upgrade Step 2' 'Delete Old Kernel' 'Exit'; do break; done;
	[ "$selected" == 'Exit' ] && echo 'Exit Upgrade.' && exit;
	if [ "$selected" == 'Upgrade Step 1' ]; then
		upgradeYum;
	elif [ "$selected" == 'Upgrade Step 2' ]; then
		upgradeKernel;
        confirmKernel;
	elif [ "$selected" == 'Delete Old Kernel' ]; then
		removeOldKernel;
	else
		ConfirmInstall;
		return;
	fi;
	echo "[OK] You Selected: ${selected}";
}

checkSystem;