1. 在AWS CDK中创建一个EC2实例。

2. 在实例启动期间，在UserData中添加脚本以安装必要的软件并启动Flask应用程序。

以下是一个示例CDK代码：

from aws_cdk import (
    aws_ec2 as ec2,
    aws_iam as iam,
    aws_autoscaling as autoscaling,
    core,
)

class FlaskOnEC2Stack(core.Stack):
    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
        super().__init__(scope, id, **kwargs)

        # 创建VPC
        vpc = ec2.Vpc(
            self, "MyVPC",
            max_azs=2,
            nat_gateways=1
        )

        asg_role = iam.Role(
            self, "ASGRole",
            assumed_by=iam.ServicePrincipal("ec2.amazonaws.com"),
        )

        # 启动脚本
        script = """#!/bin/bash
        yum update -y
        yum install -y git mysql gcc python3-devel python3-pip
        pip3 install Flask uwsgi

        cd /home/ec2-user
        git clone ${FLASK_APP_REPO}
        cd my_flask_app
        mkdir /home/ec2-user/logs

        uwsgi --socket 127.0.0.1:3333 --module my_flask_app:app --callable app --stats /tmp/stats.sock &

        # 下面的命令将启动uWSGI进程并将输出重定向到文件
        uwsgi_cmd='/usr/local/bin/uwsgi --socket 127.0.0.1:3333 --module my_flask_app:app --callable app --stats /tmp/stats.sock'
        echo "Starting uwsgi with command $uwsgi_cmd" >> /home/ec2-user/logs/startup.log
        $uwsgi_cmd >> /home/ec2-user/logs/uwsgi.log 2>&1 &
        """

        # 创建启动配置
        launch_config = autoscaling.LaunchConfiguration(
            self, "LaunchConfig",
            instance_type=ec2.InstanceType