I'm getting timeout errors when trying to create AWS Batch jobs using the AWS Javascript SDK from a Lambda.
How can I connect to AWS Batch from a Lambda instance besides creating public/private subnets with a NAT gateway?
The only other way is to not put your lambda in VPC. If you really need your function to be in VPC, the only way is to place it in private subnet and then use NAT in public subnet. This is because there is no VPC interface endpoint for AWS Batch.
You could also have second lambda function, not in VPC. So the main function in the VPC, invokes the second one which operates on AWS Batch. This will work, because AWS Lambda has interface endpoint which allows you to invoke functions from VPC without internet access.
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I have a Lambda function deployed into a public subnet in a VPC and I’m trying to connect to a Lambda function outside of a VPC and I’m running into connectivity issues.
I believe the security group settings and IAM policies will permit the connection, but I'm not sure if there's an issue with connecting to an out-of-VPC Lambda from an in-VPC one.
Is there a tool in AWS Console, AWS CLI or anywhere else that I can use to troubleshoot where the connection is failing? I’ve used the Reachability Analyzer before but it only works on a handful of resource types like EC2 instances.
I've tried invoking the out-of-VPC Lambda from inside my in-VPC Lambda, but the request doesn't work and I don't see any helpful information about what happened. I tried running the Reachability Analyzer, but it doesn't allow you to test if Lambda functions are reachable.
I was expecting the request to work, but I'm not sure if I need to configure a VPC interface endpoint because I'm connecting from an in-VPC Lambda to an out-of-VPC Lambda.
I’m new to networking and would appreciate any help.
I have a Lambda function deployed into a public subnet in a VPC and I’m trying to connect to a Lambda function outside of a VPC and I’m running into connectivity issues.
The Lambda function in the VPC never gets a public IP assigned to it. So it can't connect to anything outside of the VPC. It can't use the Internet Gateway attached to the public subnet because it doesn't have a public IP.
By "connect to a Lambda function outside of a VPC" what you are really doing is connecting to the AWS API outside of the VPC. You never "connect" to a Lambda function, because Lambda functions aren't running and just sitting around idle waiting for your request. Lambda functions don't really exist until a request comes in to the AWS Lambda Invoke API, at which point AWS spins up an instance of the Lambda function and passes it the invocation payload.
To fix this connectivity issue, you either need to create an AWS Lambda VPC Endpoint in your VPC, to handle requests to the Lambda API originating in your VPC. Or you need to move the VPC Lambda function to a private subnet, with a route to a NAT Gateway. Lambda functions in private subnets can access things outside the VPC by having their requests routed through the NAT Gateway.
I was expecting the request to work, but I'm not sure if I need to configure a VPC interface endpoint because I'm connecting from an in-VPC Lambda to an out-of-VPC Lambda.
That's not how VPC Interface Endpoints work. The entire purpose of VPC Interface Endpoints is to allow a resource inside your VPC to access part of the AWS API that exists outside the VPC. A VPC Interface Endpoint will absolutely allow your Lambda function running in the VPC to access the Lambda Invoke API, in order to trigger an execution of your out-of-VPC Lambda function.
I am connecting to AWS DocumentDB from a Lambda function. In order to be able to do this I had to attach lambda to the default VPC (that's where DocumentDB cluster is running) and the default (public) subnets. But, this has caused my Lambda to timeout whenever trying make an outbound request, e.g. push message to SQS. This, I want to avoid.
So what is the recommended way of connecting to DocumentDB without loosing functionality that occurs when putting Lambda in the VPC? There's gotta be a simple solution.
Lambda functions in a VPC never get a public IP address. So if the function needs to access both VPC resources and other resources outside of the VPC the function has to be deployed only to private subnets with routes to a NAT Gateway.
Alternatively, if the only external resources you need to access are other AWS services, then you could add VPC Endpoints for those services to the VPC.
I have the following resources provisioned in AWS:
A VPC (the default VPC for my AWS region) with 3 subnets and an internet gateway
An EC2 instance in the VPC with an elastic IP attached, and a NodeJS application server running
A RDS instance in the VPC
A Lambda function configured to run in the VPC (because it needs to access RDS)
An S3 bucket
An SQS queue
The application server running on my EC2 instance is able to connect to S3 and SQS using the AWS SDK for NodeJS. All I had to do was specify the S3 bucket's name and SQS queue's url.
However, my lambda function was unable to do the same until I set up a VPC Gateway Endpoint for S3, and a VPC Interface Endpoint for SQS. This despite the lambda function having internet access - I was able to retrieve a file on the internet in a test run of the lambda function.
What was preventing the lambda function from accessing S3 and SQS until the VPC endpoints were created?
default VPC for my AWS region
The default VPC has all its subnets public. Lambda does not have internet access, even if you place it in such a subnet. Thus it can't access S3 nor anything else.
To enable internet access for your lambda, it must be placed in private subnet and use NAT to access the internet, as explained in AWS docs.
Alternatively, you have to create VPC interface endpoints for S3 and SQS. This way your lambda will use the VPC endpoints to access these services, rather then trying to do it using internet.
when the lambda function is not within vpc then iam able to add a step to emr cluster but if the lambda function is residing inside vpc where emr cluster is present and same private VPC subnet also.
This time iam getting timeout error when iam trying to add a step in emr cluster using boto3 client module "add_job_flow_steps"
"errorMessage": "2020-05-14T02:48:46.771Z ad979ac2-ff26-476a-b301-23797caeeaa9 Task timed out after 123.10 seconds".
Do i need to add a VPC Endpoint for me to communicate between AWS services within same VPC Subnet or is there any other way which i could communicate?
when the lambda function is not within vpc then iam able to add a step to emr cluster
This works because lambda not in vpc, can access internet. Subsequently, you can connect to public endpoint of AWS services, such as EMR.
if the lambda function is residing inside vpc where emr cluster is present and same private VPC subnet also.
This does not work, because lambda in VPC does not have internet access:
If your function needs internet access, use NAT. Connecting a function to a public subnet does not give it internet access or a public IP address.
To enable your lambda access the EMR service you need to use either NAT gateway or VPC interface endpoint as shown in the following link:
Connect to Amazon EMR Using an Interface VPC Endpoint
Please not that lambda in VPC also requires modified execution role.
I have hosted a Lambda function using AWS Chalice inside a VPC since I want it to access a Serverless Aurora DB Instance. Now I also want this function to send_message() to an SQS.
I followed Tutorial: Sending a Message to an Amazon SQS Queue from Amazon Virtual Private Cloud and was able to call the SQS from inside my EC2. But even then I could not use my Lambda function to call the SQS.
It would be very helpful if someone could actually tell me how to do the whole thing manually rather than using the CloudFormation stack, or at least tell me how to get the SQS Endpoint working.
It appears that your situation is:
An Amazon VPC with an Amazon Aurora database
An AWS Lambda function that wants to communicate with the Aurora database AND an Amazon SQS queue
An AWS Lambda function can be configured as:
Connected to a subnet in a VPC, or
Not connected to a VPC, which means it is connected to the Internet
If you wish to have an AWS Lambda function communicate with resources inside a VPC AND the Internet, then you will need:
The Lambda function connected to a private subnet
A NAT Gateway in a public subnet
An Internet Gateway connected to the public subnet (it is most probably already in your VPC)
Alternatively, you can use a VPC Endpoint for SQS, which allows the Lambda function to access SQS without going to the Internet. If you are wanting to connect to multiple service (eg S3, SNS, SQS), it is probably easier just to use a NAT Gateway rather than creating VPC Endpoints for each service.
You either need to add a VPC Endpoint for SQS to your VPC, or place the Lambda function in subnets with a route to a NAT Gateway.