使用VPC中运行的Lambda提供的AWS开发工具包

Question

I have a simple lambda function as follows

var AWS = require("aws-sdk");

exports.handler = (event, context, callback) => {

var ec2 = new AWS.EC2({region:'us-east-1'});
return ec2.describeRegions({}).promise()
.then(function(regionResponse) {
    console.log(regionResponse.Regions)
    callback(null, regionResponse.Regions);
})
.catch(
    function (err) {
        console.log({"error" : err});
        callback(err, null);
    }
)

};

I can run this function outside of a VPC successfully.

I create a VPC using the VPC wizard and create a VPC with a single public subnet and an Internet Gateway. I place the function in the VPC and give it an execution role with Lambda VPC Execution rights. It now fails with a timeout, which I have set to 10 seconds (normal execution 1 sec)

What am I missing from my config that prevents the function from accessing the AWS SDK inside the VPC?

Answer 1

1. You are putting callback after return statement. Of course it will never be executed because you returned from the function.

2. If the subnet you are running the Lambda is not public or does not have NAT Gateway, it won't be able to connect to Internet, thus to AWS API's.