使用AWS SDK启动ec2实例时指定存储(Specify storage when launching ec2 instance with AWS SDK)

 在文档中找不到如何在启动新的ec2实例时指定根存储。 如果我通过Web界面启动实例，我可以完成以下步骤：  
 
 在启动实例之前更改存储设置。 我怎么能用SDK做到这一点？ 目前我有： 
 
AWS = require('aws-sdk');
var ec2 = new AWS.EC2({
  accessKeyId: accessKeyId,
  secretAccessKey: secretAccessKey,
  region: 'us-east-1'
});

var params = {
  ImageId: 'ami-123456',
  InstanceType: 't2.micro',
  MinCount: 1, MaxCount: 1,
  SecurityGroups: [
    'my-security-group',
  ],
  // how to specify storage settings??
};

// Create the instance
ec2.runInstances(params, function(err, data) {
  if (err) { console.log("Could not create instance", err); return; }

  var instanceId = data.Instances[0].InstanceId;
  console.log("Created instance", instanceId);
});

In could not find in the docs how to specify the root storage when starting a new ec2 instance. If I start an instance through the web interface, I can go through this step: 
 
to change storage settings before launching the instance. How can I do that with the SDK? Currently I have:
 
AWS = require('aws-sdk');
var ec2 = new AWS.EC2({
  accessKeyId: accessKeyId,
  secretAccessKey: secretAccessKey,
  region: 'us-east-1'
});

var params = {
  ImageId: 'ami-123456',
  InstanceType: 't2.micro',
  MinCount: 1, MaxCount: 1,
  SecurityGroups: [
    'my-security-group',
  ],
  // how to specify storage settings??
};

// Create the instance
ec2.runInstances(params, function(err, data) {
  if (err) { console.log("Could not create instance", err); return; }

  var instanceId = data.Instances[0].InstanceId;
  console.log("Created instance", instanceId);
});

原文：https://stackoverflow.com/questions/39985698