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CentOS 7 内核升级脚本 (kernel-lt-5.4)
脚本内容，均无加密可放心使用，如果不想看可以拉到最后看使用脚本
#!/bin/bash# =====================================================# CentOS 7 内核一键安装脚本 - 源修复版# 版本: 3.0# 描述: 修复CentOS 7源问题，直接从网络下载并安装kernel-lt-5.4.278# =====================================================
# 设置严格模式（兼容老旧系统）set -eo pipefailset +u # 避免未定义变量报错
# 颜色定义RED='\033[0;31m'GREEN='\033[0;32m'YELLOW='\033[1;33m'BLUE='\033[0;34m'PURPLE='\033[0;35m'CYAN='\033[0;36m'WHITE='\033[1;37m'NC='\033[0m'
# 配置常量readonly KERNEL_VERSION="5.4.278-1.el7.elrepo.x86_64"readonly KERNEL_PACKAGE="kernel-lt-${KERNEL_VERSION}.rpm"readonly DOWNLOAD_URL="http://linux.6wd.cn/${KERNEL_PACKAGE}"readonly LOG_FILE="/var/log/kernel-install-$(date +%Y%m%d-%H%M%S).log"readonly BACKUP_DIR="/root/kernel-backup-$(date +%Y%m%d-%H%M%S)"
# 错误退出函数error_exit() { echo -e "\n${RED}╔════════════════════════════════════════════════════════════════╗${NC}" echo -e "${RED}║ ❌ 安装失败 ❌ ║${NC}" echo -e "${RED}╠════════════════════════════════════════════════════════════════╣${NC}" echo -e "${RED}║${WHITE} 错误: $1${NC}" echo -e "${RED}║${WHITE} 日志: $LOG_FILE${NC}" echo -e "${RED}╚════════════════════════════════════════════════════════════════╝${NC}" exit 1}
# 清理函数cleanup() { if [[ -f "$KERNEL_PACKAGE" ]]; then rm -f "$KERNEL_PACKAGE" 2>/dev/null echo -e "${BLUE}[清理] 已删除临时文件: $KERNEL_PACKAGE${NC}" | tee -a "$LOG_FILE" fi}
# 设置陷阱trap cleanup EXITtrap 'echo -e "\n${RED}[中断] 脚本被用户终止${NC}" | tee -a "$LOG_FILE"; exit 130' INT TERM
# 打印横幅print_banner() { clear 2>/dev/null || true echo -e "${PURPLE}╔════════════════════════════════════════════════════════════════╗${NC}" echo -e "${PURPLE}║${WHITE}${BOLD} CentOS 7 内核一键安装脚本 (源修复版) ${PURPLE}║${NC}" echo -e "${PURPLE}╠════════════════════════════════════════════════════════════════╣${NC}" printf "${PURPLE}║${WHITE} 目标内核: ${GREEN}%-45s${PURPLE}║${NC}\n" "$KERNEL_VERSION" printf "${PURPLE}║${WHITE} 日志文件: ${BLUE}%-45s${PURPLE}║${NC}\n" "$LOG_FILE" echo -e "${PURPLE}╚════════════════════════════════════════════════════════════════╝${NC}" echo ""}
# 修复CentOS 7源fix_centos_repo() { echo -e "${BLUE}[1/7] 修复CentOS 7 yum源...${NC}" | tee -a "$LOG_FILE"
# 备份原有源 if [[ -d /etc/yum.repos.d ]]; then mkdir -p /etc/yum.repos.d/backup mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/ 2>/dev/null || true fi
# 使用阿里云镜像源（CentOS 7 vault） cat > /etc/yum.repos.d/CentOS7-Aliyun.repo << 'EOF'[base]name=CentOS-7 - Base - Aliyunbaseurl=http://mirrors.aliyun.com/centos-vault/7.9.2009/os/\$basearch/gpgcheck=1gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7enabled=1
[updates]name=CentOS-7 - Updates - Aliyunbaseurl=http://mirrors.aliyun.com/centos-vault/7.9.2009/updates/\$basearch/gpgcheck=1gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7enabled=1
[extras]name=CentOS-7 - Extras - Aliyunbaseurl=http://mirrors.aliyun.com/centos-vault/7.9.2009/extras/\$basearch/gpgcheck=1gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7enabled=1
[epel]name=Extra Packages for Enterprise Linux 7 - \$basearchbaseurl=http://mirrors.aliyun.com/epel/7/\$basearchgpgcheck=0enabled=1EOF
# 添加elrepo源（用于内核） rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org 2>/dev/null || true cat > /etc/yum.repos.d/elrepo.repo << 'EOF'[elrepo]name=ELRepo.org Community Enterprise Linux Repository - el7baseurl=http://mirrors.aliyun.com/elrepo/elrepo/el7/\$basearch/ http://elrepo.org/linux/elrepo/el7/\$basearch/enabled=1gpgcheck=1gpgkey=https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgprotect=0
[elrepo-kernel]name=ELRepo.org Community Enterprise Linux Kernel Repository - el7baseurl=http://mirrors.aliyun.com/elrepo/kernel/el7/\$basearch/ http://elrepo.org/linux/kernel/el7/\$basearch/enabled=1gpgcheck=1gpgkey=https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgprotect=0EOF
# 清理缓存 yum clean all >> "$LOG_FILE" 2>&1 yum makecache >> "$LOG_FILE" 2>&1
echo -e "${GREEN}✓ yum源修复完成${NC}" | tee -a "$LOG_FILE"}
# 检查root权限check_root() { echo -e "${BLUE}[2/7] 检查权限...${NC}" | tee -a "$LOG_FILE" if [[ $EUID -ne 0 ]]; then error_exit "此脚本必须以root权限运行" fi echo -e "${GREEN}✓ root权限验证通过${NC}" | tee -a "$LOG_FILE"}
# 检查系统check_system() { echo -e "${BLUE}[3/7] 检查系统版本...${NC}" | tee -a "$LOG_FILE"
if [[ ! -f /etc/centos-release ]]; then error_exit "此脚本仅支持CentOS系统" fi
local centos_version=$(cat /etc/centos-release | grep -oP '[0-9]+' | head -1) if [[ "$centos_version" != "7" ]]; then error_exit "此脚本仅支持CentOS 7，当前版本: $(cat /etc/centos-release)" fi
local arch=$(uname -m) if [[ "$arch" != "x86_64" ]]; then error_exit "此脚本仅支持x86_64架构，当前架构: $arch" fi
echo -e "${GREEN}✓ 系统版本: $(cat /etc/centos-release) ($arch)${NC}" | tee -a "$LOG_FILE"}
# 检查磁盘空间check_disk_space() { echo -e "${BLUE}[4/7] 检查磁盘空间...${NC}" | tee -a "$LOG_FILE"
BOOT_FREE=$(df -m /boot | awk 'NR==2 {print $4}') if [[ "$BOOT_FREE" -lt 200 ]]; then error_exit "/boot分区空间不足（可用: ${BOOT_FREE}MB），需要至少200MB" fi echo -e "${GREEN}✓ /boot分区可用: ${BOOT_FREE}MB${NC}" | tee -a "$LOG_FILE"}
# 下载内核文件download_kernel() { echo -e "${BLUE}[5/7] 开始下载内核文件...${NC}" | tee -a "$LOG_FILE" echo "下载地址: $DOWNLOAD_URL" | tee -a "$LOG_FILE"
# 选择下载工具 if command -v wget &>/dev/null; then echo "使用 wget 下载..." | tee -a "$LOG_FILE" wget -O "$KERNEL_PACKAGE" "$DOWNLOAD_URL" --progress=bar:force 2>&1 | tee -a "$LOG_FILE" elif command -v curl &>/dev/null; then echo "使用 curl 下载..." | tee -a "$LOG_FILE" curl -L -o "$KERNEL_PACKAGE" "$DOWNLOAD_URL" --progress-bar 2>&1 | tee -a "$LOG_FILE" else error_exit "未找到 wget 或 curl，无法下载" fi
# 验证下载 if [[ ! -f "$KERNEL_PACKAGE" ]]; then error_exit "下载失败：文件未找到" fi
# 兼容Linux/BSD的stat命令 FILE_SIZE=$(stat -c%s "$KERNEL_PACKAGE" 2>/dev/null) if [[ -z "$FILE_SIZE" ]]; then FILE_SIZE=$(stat -f%z "$KERNEL_PACKAGE" 2>/dev/null) fi
if [[ -z "$FILE_SIZE" || "$FILE_SIZE" -lt 10000000 ]]; then error_exit "下载文件不完整（大小: ${FILE_SIZE:-0} 字节）" fi echo -e "${GREEN}✓ 下载成功，文件大小: $((FILE_SIZE/1024/1024))MB${NC}" | tee -a "$LOG_FILE"}
# 安装依赖install_dependencies() { echo -e "${BLUE}[6/7] 安装依赖包...${NC}" | tee -a "$LOG_FILE"
# 先安装epel-release yum install -y epel-release >> "$LOG_FILE" 2>&1 || true
# 安装必要的工具 local packages=( "grub2-tools" "coreutils" "numfmt" "file" "which" )
local failed=0 for pkg in "${packages[@]}"; do echo -n " 安装 $pkg... " | tee -a "$LOG_FILE" if yum install -y "$pkg" >> "$LOG_FILE" 2>&1; then echo -e "${GREEN}成功${NC}" | tee -a "$LOG_FILE" else echo -e "${YELLOW}跳过${NC}" | tee -a "$LOG_FILE" fi done
echo -e "${GREEN}✓ 依赖安装完成${NC}" | tee -a "$LOG_FILE"}
# 安装内核install_kernel() { echo -e "${BLUE}[7/7] 安装内核...${NC}" | tee -a "$LOG_FILE"
# 尝试yum安装 echo "尝试使用yum安装..." | tee -a "$LOG_FILE" if yum localinstall -y "$KERNEL_PACKAGE" >> "$LOG_FILE" 2>&1; then echo -e "${GREEN}✓ yum安装成功${NC}" | tee -a "$LOG_FILE" else echo -e "${YELLOW}⚠ yum安装失败，尝试rpm强制安装...${NC}" | tee -a "$LOG_FILE"
# 安装内核依赖 yum install -y elfutils-libelf-devel >> "$LOG_FILE" 2>&1 || true
# rpm强制安装 rpm -ivh --replacepkgs "$KERNEL_PACKAGE" --nodeps >> "$LOG_FILE" 2>&1 || { error_exit "内核安装失败，请检查日志: $LOG_FILE" } echo -e "${GREEN}✓ rpm安装成功${NC}" | tee -a "$LOG_FILE" fi
# 验证安装 if rpm -q "kernel-lt-${KERNEL_VERSION}" &>/dev/null; then echo -e "${GREEN}✓ 内核安装验证通过${NC}" | tee -a "$LOG_FILE" else error_exit "内核安装验证失败：rpm数据库中未找到" fi}
# 配置GRUBconfigure_grub() { echo -e "${BLUE}[8/8] 配置GRUB引导...${NC}" | tee -a "$LOG_FILE"
GRUB_CFG="/boot/grub2/grub.cfg" if [[ ! -f "$GRUB_CFG" ]]; then error_exit "GRUB配置文件不存在: $GRUB_CFG" fi
# 获取GRUB菜单项 GRUB_ENTRIES=$(awk -F\' '$1=="menuentry " {print i++ " : " $2}' "$GRUB_CFG" 2>/dev/null) if [[ -z "$GRUB_ENTRIES" ]]; then error_exit "无法读取GRUB菜单项" fi
# 查找新内核索引 NEW_INDEX=$(echo "$GRUB_ENTRIES" | grep -n "$KERNEL_VERSION" | head -1 | cut -d: -f1) if [[ -z "$NEW_INDEX" ]]; then KERNEL_MAIN_VER="${KERNEL_VERSION%%-*}" NEW_INDEX=$(echo "$GRUB_ENTRIES" | grep -n "$KERNEL_MAIN_VER" | head -1 | cut -d: -f1) echo -e "${YELLOW}⚠ 使用模糊匹配找到内核索引${NC}" | tee -a "$LOG_FILE" fi
# 转换为0-based索引 if [[ -n "$NEW_INDEX" ]]; then NEW_INDEX=$((NEW_INDEX - 1)) echo -e "${GREEN}✓ 找到新内核GRUB索引: $NEW_INDEX${NC}" | tee -a "$LOG_FILE" else NEW_INDEX=0 echo -e "${YELLOW}⚠ 未找到新内核索引，使用默认索引0${NC}" | tee -a "$LOG_FILE" fi
# 设置默认启动项 if grub2-set-default "$NEW_INDEX" >> "$LOG_FILE" 2>&1; then echo -e "${GREEN}✓ 默认启动项设置成功${NC}" | tee -a "$LOG_FILE" else echo -e "${YELLOW}⚠ grub2-set-default失败，尝试手动设置...${NC}" | tee -a "$LOG_FILE" GRUBENV="/boot/grub2/grubenv" if [[ -f "$GRUBENV" ]]; then cp -a "$GRUBENV" "${GRUBENV}.backup" if grep -q '^saved_entry=' "$GRUBENV"; then sed -i "s/^saved_entry=.*/saved_entry=$NEW_INDEX/" "$GRUBENV" else echo "saved_entry=$NEW_INDEX" >> "$GRUBENV" fi echo -e "${GREEN}✓ 手动设置成功${NC}" | tee -a "$LOG_FILE" fi fi
# 重新生成GRUB配置 grub2-mkconfig -o "$GRUB_CFG" >> "$LOG_FILE" 2>&1 echo -e "${GREEN}✓ GRUB配置已更新${NC}" | tee -a "$LOG_FILE"}
# 显示完成信息show_completion() { echo -e "\n${GREEN}╔════════════════════════════════════════════════════════════════╗${NC}" echo -e "${GREEN}║${WHITE}${BOLD} ✅ 安装成功！ ${GREEN}║${NC}" echo -e "${GREEN}╠════════════════════════════════════════════════════════════════╣${NC}" echo -e "${GREEN}║${WHITE} 当前内核: ${NC}$(uname -r)" | tee -a "$LOG_FILE" echo -e "${GREEN}║${WHITE} 新内核: ${GREEN}$KERNEL_VERSION${NC}" | tee -a "$LOG_FILE" echo -e "${GREEN}║${WHITE} 日志文件: ${BLUE}$LOG_FILE${NC}" | tee -a "$LOG_FILE" echo -e "${GREEN}╚════════════════════════════════════════════════════════════════╝${NC}" echo ""
# 询问重启 echo -ne "${YELLOW}是否立即重启系统？${NC} (y/n): " read -r reboot_choice if [[ "$reboot_choice" =~ ^[Yy]$ ]]; then echo -e "${BLUE}系统将在5秒后重启...${NC}" echo -e "${RED}按 Ctrl+C 取消重启${NC}" sleep 5 sync && reboot else echo -e "${BLUE}请手动执行 'reboot' 重启系统${NC}" echo -e "${BLUE}重启后执行 'uname -r' 验证内核版本${NC}" fi}
# ========== 主函数 ==========main() { print_banner
# 执行步骤 check_root check_system check_disk_space fix_centos_repo # 新增：修复yum源 download_kernel install_dependencies install_kernel configure_grub
# 完成 show_completion}
# ========== 执行主函数 ==========main "$@"✨ 主要修复内容
1. 修复yum源问题 (新增 fix_centos_repo 函数)
- 使用阿里云镜像源替换失效的腾讯云源
- 添加elrepo源用于内核支持
- 自动备份原有源配置
2. 增强依赖安装 (改进 install_dependencies 函数)
- 即使部分依赖安装失败也能继续
- 添加必要工具如
numfmt、file等 - 更详细的安装状态显示
3. 改进错误处理
- 更友好的错误提示界面
- 详细的步骤显示
- 添加8个步骤的完整流程
4. 添加美化功能
- 使用Unicode边框
- 彩色进度显示
- 清晰的步骤分隔
📥 使用方法
# 直接运行（会自动修复源问题）bash <(curl -s http://linux.6wd.cn/up.sh)
# 或者下载后运行curl -o up.sh http://linux.6wd.cn/up.shchmod +x up.sh./up.sh这个版本会自动修复yum源问题，使用阿里云镜像，确保依赖包能正常下载！
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CentOS 7 内核升级脚本 (kernel-lt-5.4)
https://6wd.cn/posts/centos7-kernel-lt-5-4-upgrade/ 部分信息可能已经过时
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