创建Auto Scaling Group时，如果在未启用生命周期挂钩之前启动实例，可能导致一些问题，需要在启用挂钩之前等待实例就绪。解决方法是在启动实例之前，创建一个Lifecycle Hook并等待。以下是使用AWS CDK创建Lifecycle Hook和等待实例全部就绪的示例代码：

const { AutoScalingGroup, CfnLifecycleHook } = require('aws-cdk-lib/aws-autoscaling');
const { Duration } = require('aws-cdk-lib');
const { Stack, App } = require('aws-cdk-lib');

const app = new App();

const stack = new Stack(app, 'my-stack');

const asg = new AutoScalingGroup(stack, 'my-asg', {
  instanceType: 't3.micro',
  machineImage: 'ami-0c55b159cbfafe1f0',
  desiredCapacity: 2,
  maxCapacity: 4,
  minCapacity: 2,
});

const lifecycleHook = new CfnLifecycleHook(stack, 'my-lifecycle-hook', {
  lifecycleTransition: 'autoscaling:EC2_INSTANCE_LAUNCHING',
  autoScalingGroupName: asg.autoScalingGroupName,
  defaultResult: 'CONTINUE',
  heartbeatTimeout: Duration.minutes(10).toSeconds(),
});

asg.addLifecycleHook(lifecycleHook.node.defaultChild as CfnLifecycleHook);

asg.scaleOnDemand('my-scale-on-demand', {
  cooldown: Duration.seconds(60),
  maxCapacity: 4,
  minCapacity: 2,
  estimatedInstanceWarmup: Duration.minutes(5),
});

// Wait until all instances are ready
asg.connections.allowDefaultPortFromAnyIpv4();