分享一个可以一键制作在线yum源的脚本

复制代码
#!/bin/bash
# 自动化配置CentOS 7在线yum源（基于阿里云归档源）
# 需以root权限执行

# 检查是否为root用户
if [ "$(id -u)" -ne 0 ]; then
    echo "错误：请使用root权限执行此脚本（sudo或直接登录root）"
    exit 1
fi

echo "===== 开始配置DNS解析 ====="
# 备份原有DNS配置
cp /etc/resolv.conf /etc/resolv.conf.bak$(date +%Y%m%d)
# 添加通用DNS服务器（避免域名解析失败）
cat << EOF >> /etc/resolv.conf
nameserver 114.114.114.114  # 国内通用DNS
nameserver 8.8.8.8          # 备用DNS
EOF
echo "DNS配置完成"


echo -e "\n===== 开始替换CentOS 7 yum源 ====="
# 备份原有yum源配置
if [ -f "/etc/yum.repos.d/CentOS-Base.repo" ]; then
    mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak$(date +%Y%m%d)
    echo "已备份原有yum源配置"
fi

# 安装curl（如果未安装，用于下载源配置）
if ! command -v curl &> /dev/null; then
    echo "未检测到curl，尝试通过原有源安装（若失败可手动安装）"
    yum install -y curl || {
        echo "curl安装失败，尝试使用wget替代"
        yum install -y wget || {
            echo "错误：curl和wget均无法安装，请检查基础网络"
            exit 1
        }
    }
fi

# 下载阿里云CentOS 7归档源
echo "下载阿里云CentOS 7源配置..."
if command -v curl &> /dev/null; then
    curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo || {
        echo "阿里云源下载失败，尝试官方归档源..."
        # 若阿里云失败，直接写入官方vault源配置
        cat << EOF > /etc/yum.repos.d/CentOS-Base.repo
[base]
name=CentOS-\$releasever - Base
baseurl=https://vault.centos.org/7.9.2009/os/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-\$releasever - Updates
baseurl=https://vault.centos.org/7.9.2009/updates/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-\$releasever - Extras
baseurl=https://vault.centos.org/7.9.2009/extras/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7
EOF
    }
else
    # 若curl不可用，用wget下载
    wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo || {
        echo "阿里云源下载失败，使用官方归档源..."
        # 写入官方vault源配置（同上文）
        cat << EOF > /etc/yum.repos.d/CentOS-Base.repo
[base]
name=CentOS-\$releasever - Base
baseurl=https://vault.centos.org/7.9.2009/os/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-\$releasever - Updates
baseurl=https://vault.centos.org/7.9.2009/updates/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-\$releasever - Extras
baseurl=https://vault.centos.org/7.9.2009/extras/\$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-7
EOF
    }
fi

# 替换源配置中的$releasever为具体版本7（避免变量解析问题）
sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo
echo "yum源配置替换完成"


echo -e "\n===== 清理并重建yum缓存 ====="
yum clean all &> /dev/null
yum makecache &> /dev/null || {
    echo "缓存重建失败，尝试强制重建..."
    yum makecache fast
}
echo "yum缓存重建完成"


echo -e "\n===== 测试安装git（验证源有效性） ====="
yum install -y git && {
    echo -e "\n===== 全部操作完成！yum源已配置，git安装成功 ====="
    exit 0
}

# 若git安装失败，提示可能的问题
echo -e "\n警告：git安装失败，可能源仍有问题，请检查网络或手动调整源配置"
exit 1
使用方法：
将脚本保存为 fix_centos7_yum.sh
赋予执行权限：chmod +x fix_centos7_yum.sh
执行脚本：./fix_centos7_yum.sh