使用AWS SDK启动ec2实例时指定存储

Question

在docs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，我可以执行此步骤：

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);
});

Answer 1

BlockDeviceMappings:[{ DeviceName:'/dev/sda1', Ebs:{ VolumeSize:8, DeleteOnTermination:true, VolumeType:"gp2", } }]