通过lambda访问所有ec2跨区域

跨区域为所有ec2执行一个lambda函数

    var aws = require('aws-sdk');  
aws.config.region = 'us-east-1','ap-south-1','eu-central-1';  
var ec2 = new aws.EC2();  
var now = new Date();  
date = now.toISOString().substring(0, 10)  
hours = now.getHours()  
minutes = now.getMinutes()  
exports.handler = function(event, context) {  
    var instanceparams = {
        Filters: [{
            Name: 'tag:Backup',
            Values: [
                'yes'
            ]
        }]
    }
    ec2.describeInstances(instanceparams, function(err, data) {
        if (err) console.log(err, err.stack);
        else {
            for (var i in data.Reservations) {
                for (var j in data.Reservations[i].Instances) {
                    instanceid = data.Reservations[i].Instances[j].InstanceId;
                    nametag = data.Reservations[i].Instances[j].Tags
                    for (var k in data.Reservations[i].Instances[j].Tags) {
                        if (data.Reservations[i].Instances[j].Tags[k].Key == 'Name') {
                            name = data.Reservations[i].Instances[j].Tags[k].Value;
                        }
                    }
                    console.log("Creating AMIs of the Instance: ", name);
                    var imageparams = {
                        InstanceId: instanceid,
                        Name: name + "_" + date + "_" + hours + "-" + minutes,
                        NoReboot: true
                    }
                    ec2.createImage(imageparams, function(err, data) {
                        if (err) console.log(err, err.stack);
                        else {
                            image = data.ImageId;
                            console.log(image);
                            var tagparams = {
                                Resources: [image],
                                Tags: [{
                                    Key: 'DeleteOn',
                                    Value: 'yes'
                                }]
                            };
                            ec2.createTags(tagparams, function(err, data) {
                                if (err) console.log(err, err.stack);
                                else console.log("Tags added to the created AMIs");
                            });
                        }
                    });
                }
            }
        }
    });
}

哪里aws.config.region文件用于区域配置..它用于当前(lambda部署的)区域