此脚本作用是使Linux系统安装chrony软件实现自动校时功能 NTP池有10.10.1.10内网地址与阿里云和香港时间地址

SHELL
#!/bin/bash
# 定义 NTP 服务器地址
NTP_SERVERS=(
    "server 10.10.1.10 iburst"
    "server 172.16.26.2 iburst"
    "server 3.hk.pool.ntp.org iburst"
    "server 1.asia.pool.ntp.org iburst"
    "server 3.asia.pool.ntp.org iburst"
    "server ntp.aliyun.com iburst"
)

# 检查操作系统信息
get_os_info() {
    if [[ -f /etc/os-release ]]; then
        . /etc/os-release
        OS_ID=$ID
        OS_VERSION_ID=$VERSION_ID
    elif [[ -f /etc/redhat-release ]]; then
        OS_ID="centos"
        OS_VERSION_ID=$(grep -oE '[0-9]+' /etc/redhat-release | head -n1)
    else
        echo "无法检测到操作系统信息" >&2
        exit 1
    fi
}

# 修改时区
set_timezone() {
    echo "正在将时区设置为 Asia/Shanghai..."
    if command -v timedatectl >/dev/null 2>&1; then
        timedatectl set-timezone Asia/Shanghai
    else
        echo "系统不支持 timedatectl，使用手动方式设置时区..."
        rm -f /etc/localtime
        ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    fi

    # 显示当前时间设置
    echo "当前时间设置："
    date
}

# 检查 chrony 同步状态
check_chrony_status() {
    if command -v chronyc >/dev/null 2>&1; then
        LEAP_STATUS=$(chronyc tracking | grep 'Leap status' | awk '{print $NF}')
        if [[ "$LEAP_STATUS" == "Normal" ]]; then
            echo "Chrony 已成功同步时间 (Leap status: Normal)"
            return 0
        else
            echo "Chrony 尚未同步时间，继续配置..."
            return 1
        fi
    else
        echo "Chrony 未安装或不可用"
        return 1
    fi
}

# 检查并安装 chrony
install_chrony() {
    if check_chrony_status; then
        return 0  # 如果 chrony 已经正常同步，跳过安装步骤
    fi

    case "$OS_ID" in
        centos|rocky|alma)
            if [[ "$OS_VERSION_ID" -ge "8" ]]; then
                dnf install -y chrony || { echo "chrony 安装失败"; exit 1; }
            else
                yum install -y chrony || yum install -y chronyd || { echo "chrony 安装失败"; exit 1; }
            fi
            ;;
        debian|ubuntu)
            apt-get install -y chrony || { echo "chrony 安装失败"; exit 1; }
            ;;
        *)
            echo "不支持的操作系统: $OS_ID" >&2
            exit 1
            ;;
    esac
}

# 修改 chrony 配置
modify_chrony_config() {
    case "$OS_ID" in
        centos|rocky|alma) CONFIG_FILE="/etc/chrony.conf" ;;
        debian|ubuntu) CONFIG_FILE="/etc/chrony/chrony.conf" ;;
        *)
            echo "不支持的操作系统: $OS_ID" >&2
            exit 1
            ;;
    esac

    # 备份配置文件
    cp $CONFIG_FILE "${CONFIG_FILE}.bak"

    # 注释掉现有的 server 和 pool 行
    sed -i '/^\s*\(server\|pool\) / s/^\([^#]\)/#\1/' $CONFIG_FILE

    # 添加新的 NTP 服务器
    for server in "${NTP_SERVERS[@]}"; do
        grep -qxF "$server" $CONFIG_FILE || echo "$server" >> $CONFIG_FILE
    done

    echo "已修改 $CONFIG_FILE 的时间同步地址。"
}

# 重启并启用 chrony 服务
restart_and_enable_chrony() {
    if [[ "$OS_ID" == "centos" || "$OS_ID" == "rocky" || "$OS_ID" == "alma" ]]; then
        # 获取主版本号和次版本号
        OS_VERSION_MAJOR=$(echo "$OS_VERSION_ID" | awk -F'.' '{print $1}')
        OS_VERSION_MINOR=$(echo "$OS_VERSION_ID" | awk -F'.' '{print $2}')

        if [[ "$OS_VERSION_MAJOR" -ge 7 ]]; then
            # CentOS 7 和 Rocky 8 等使用 systemd
            systemctl restart chronyd
            systemctl enable chronyd
        else
            # CentOS 6 使用 SysVinit
            /etc/init.d/chronyd restart
            chkconfig chronyd on
        fi
    elif [[ "$OS_ID" == "ubuntu" ]]; then
        if [[ "$VERSION_ID" =~ 14.* || "$VERSION_ID" =~ 16.* ]]; then
            # 对于 Ubuntu 14/16 使用 service 和 update-rc.d
            service chrony restart
            update-rc.d chrony defaults
        else
            # 对于 Ubuntu 16 以上版本使用 systemctl
            systemctl restart chrony
            systemctl enable chrony
        fi
    else
        echo "不支持的操作系统: $OS_ID" >&2
        exit 1
    fi

    if [[ $? -eq 0 ]]; then
        echo "已重启chrony服务并设置开机自启。"
        chronyc makestep > /dev/null
        echo "请输入 chronyc tracking 来验证是否同步成功"
    else
        echo "Chrony 服务重启失败" >&2
        exit 1
    fi
}



# 主函数
main() {
    get_os_info
    set_timezone
    install_chrony
    modify_chrony_config
    restart_and_enable_chrony

}

main