Linux从入门到精通—— 一键替换主流 Centos 版本国内（阿里云、华为云、腾讯云）yum和epel源

一键替换主流 Centos 版本国内（阿里云、华为云、腾讯云）yum和epel源 

#!/bin/bash
 
get_release_version() {
    cat /etc/redhat-release | awk '{match($0,"release "); print substr($0,RSTART+RLENGTH)}' | awk -F '.' '{print $1}'
}
 
update_yum_source() {
    local start_time=$(date +%s%N)
    local version=$1
    local provider=$2
    local repo_url=""
    local backup_dir="/etc/yum.repos.d/backup"
    local backup_file="$backup_dir/CentOS-Base.repo.bak.$(date +%Y%m%d%H%M%S)"
 
    mkdir -pv "$backup_dir"
 
    [ -f "/etc/yum.repos.d/CentOS-Base.repo" ] && mv "/etc/yum.repos.d/CentOS-Base.repo" "$backup_file" || true
 
    case $provider in
        aliyun)
            case $version in
                6)
                    wget_repo https://mirrors.aliyun.com/repo/Centos-vault-6.10.repo
                    if host mirrors.cloud.aliyuncs.com >/dev/null 2>&1; then
                        echo -e "\033[32m是阿里云ECS实例，YUM源已成功更新为阿里云内网YUM源地址...\033[0m"
                    else
                        sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
                        echo -e "\033[32m非阿里云ECS实例，YUM源已成功更新为阿里云外网YUM源地址...\033[0m"
                    fi
                    ;;
                7)
                    wget_repo https://mirrors.aliyun.com/repo/Centos-7.repo
                    if host mirrors.cloud.aliyuncs.com >/dev/null 2>&1; then
                        echo -e "\033[32m是阿里云ECS实例，YUM源已成功更新为阿里云内网YUM源地址...\033[0m"
                    else
                        sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
                        echo -e "\033[32m非阿里云ECS实例，YUM源已成功更新为阿里云外网YUM源地址...\033[0m"
                    fi
                    ;;
                8)
                    if host mirrors.cloud.aliyuncs.com >/dev/null 2>&1; then
                        wget_repo http://mirrors.cloud.aliyuncs.com/repo/Centos-vault-8.5.2111.repo
                        sed -i 's/mirrors.cloud.aliyuncs.com/url_tmp/g' /etc/yum.repos.d/CentOS-Base.repo && sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/CentOS-Base.repo && sed -i 's/url_tmp/mirrors.aliyun.com/g' /etc/yum.repos.d/CentOS-Base.repo
                        echo -e "\033[32m是阿里云ECS实例，YUM源已成功更新为阿里云内网YUM源地址...\033[0m"
                    else
                        wget_repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
                        echo -e "\033[32m非阿里云ECS实例，YUM源已成功更新为阿里云外网YUM源地址...\033[0m"
                    fi
                    ;;
                *)
                    echo "当前尚不支持此 CentOS 版本：$version，未来有时间将会进行补充。如有需要，请发送邮件至 zuoyangs@qq.com。"
                    exit 1
                    ;;
            esac
            ;;
        huaweicloud)
		    echo "准备更新为华为云YUM源..."  
            wget_repo "https://mirrors.huaweicloud.com/repository/conf/CentOS-${version}-anon.repo"
            ;;
        tencent)
            case $version in
                5)
                    wget_repo "http://mirrors.cloud.tencent.com/repo/centos5_base.repo"
                    ;;
                6)
                    wget_repo "http://mirrors.cloud.tencent.com/repo/centos6_base.repo"
                    ;;
                7)
                    wget_repo "http://mirrors.cloud.tencent.com/repo/centos7_base.repo"
                    ;;
                8)
                    wget_repo "http://mirrors.cloud.tencent.com/repo/centos8_base.repo"
                    ;;
                *)
                    echo "当前尚不支持此 CentOS 版本：$version，未来有时间将会进行补充。如有需要，请发送邮件至 zuoyangs@qq.com。"
                    exit 1
                    ;;
            esac
            ;;
        *)
            echo "未知的云服务提供商: $provider"
            exit 1
            ;;
    esac
}

wget_repo() {    
    local repo_url=$1    
    echo -e "\033[33m正在从 $repo_url 下载YUM源配置文件...\033[0m"  
    if ! wget -O /etc/yum.repos.d/CentOS-Base.repo "$repo_url"; then    
        echo -e "\033[31m执行 wget 失败，请检查网络连接或URL是否正确。\033[0m"  # 红色错误信息  
        exit 1    
    else    
        echo -e "\033[32mYUM源配置文件已成功下载并保存到 /etc/yum.repos.d/CentOS-Base.repo\033[0m"
    fi    
}

pre_install() {
    local start_time=$(date +%s%N)
    if command -v wget &> /dev/null; then
        :
    else
        echo "wget 没有预安装，准备安装 wget"
        yum install wget -y >/dev/null 2>&1
        echo "已安装好 wget"
    fi
    local end_time=$(date +%s%N)
    local duration=$((end_time - start_time))
    print_duration $duration "pre_install 函数执行耗时："
}
 
print_duration() {
    local duration_ns=$1
    local prefix=$2
    if [ -z "$prefix" ]; then
        prefix="执行耗时："
    fi
    if [ $duration_ns -gt 1000000000 ]; then
        duration_s=$(($duration_ns / 1000000000))
        echo "${prefix}${duration_s}秒"
    else
        duration_ms=$(($duration_ns / 1000000))
        echo "${prefix}${duration_ms}毫秒"
    fi
}
 
main() {
    local start_time=$(date +%s%N)
    echo "当前时间：$(date +'%Y-%m-%d %H:%M:%S')"
    pre_install
    local version=$(get_release_version)
    local provider=$1
    update_yum_source "$version" "$provider"
 
    yum clean all
    yum makecache
	
	yum install -y epel-release
 
    local end_time=$(date +%s%N)
    local duration=$((end_time - start_time))
    print_duration $duration "main 函数执行总耗时："
}
 
# 检查是否以 root 用户运行
if [ "$(id -u)" != "0" ]; then
    echo "该脚本必须以root用户运行" 1>&2
    exit 1
fi
 
if [[ $# -eq 0 ]]; then
    echo "用法: $0 {aliyun|huaweicloud}"
    exit 1
fi
 
main $1