How to access a Lambda API from the private subnet?
I see that there are VPC endpoints to handle AWS services accessibility from the private subnet, however, there is no support for the Lambda API.
Is there any other way to use Lambda API without having internet access?
Currently, there is no VPC endpoint available for Lambda which can be used to hit the Lambda API without routing your request over the internet.
If you don't want to give internet access to your service making the Lambda call, you can use a Private API Gateway which integrates with the Lambda function/service as the back-end. The private API gateway endpoint can be invoked using the execute-api VPC endpoint: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-private-api-test-invoke-url.html
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I am trying to set up a VPC endpoint in an existing VPC.
I am able to make calls to the private gateway endpoints from the lambda which is within the VPC.
Problem:
When I try to invoke a Regional API gateway endpoint, I am getting a 403.
Nat Gateway is setup. I am able to hit the internet via NAT gateway.
I need to call the private endpoint as well as regional endpoints from the lambdas within the VPC
Your VPC endpoint shadows your public API endpoints. From docs:
you cannot access public APIs from a VPC by using an API Gateway VPC endpoint with private DNS enabled
Thus, you can disable private DNS for the VPC endpoint. This way, you will have to explicitly use private VPC endpoint URL in your lambda.
Alternative way to access public API is through:
Note that these DNS settings don't affect the ability to call these public APIs from the VPC if you're using an edge-optimized custom domain name to access the public API
I have a AWS Lambda function written in C# with a HTTP API Gateway to expose the lambda function.
When I try to invoke another endpoint via httpPost in c#, the lambda logs doesn't display any logs and the request via POSTMAN to the API Gateway returns Service Unavailable.
Should I enable CORS or anything else? I tried to enable CORS but the result still the same.
Can someone help me, please?
AWS Lambda functions running inside a VPC are never assigned a public IP address. So by default they can't connect to anything outside of the VPC. The only way to provide access to resources outside the VPC is to either place the Lambda functions in private VPC subnets with a route to a NAT gateway, or to create VPC endpoints for those services the Lambda function needs to connect to.
I have a ECS fargate container running inside a private VPC which doesn't have internet access. It needs to invoke a lambda via AWS SDK. Based on my understanding, AWS creates a default public endpoint for the lambda and when I call invokeLambda method the traffic will always go to internet. If my understanding is right, that means my Fargate container won't be able to call the lambda. Is it right?
If it is right, what is the alternative solution is? The goal is that the traffic won't go to internet in any chance.
Can I create a private link endpoint for my lambda?
Or create a API gateway with VPC endpoint which connects to lambda?
If my understanding is right, that means my Fargate container won't be able to call the lambda. Is it right?
Yes. Without NAT gateway or instance, you won't be able to directly invoke the lambda function from private subnet.
Can I create a private link endpoint for my lambda?
Sadly no. There are not VPC interface endpoints for lambda.
Or create a API gateway with VPC endpoint which connects to lambda?
Yes, this should be possible by creating private API gateway. The private API would be only accessible from within your VPC. But API gateway to lambda will still probably go over the internet.
The Security Overview of AWS Lambda whitepaper writes:
Invocations from Amazon Kinesis and DynamoDB streams, SQS queues, Application Load Balancer,and API Gateway follow the request-response path
For request-response invocations, the payload passes from the API caller—such as AWS API Gateway or the AWS SDK—to a load balancer, and then to the Lambda invoke service. This service identifies an execution environment for the function, and passes the payload to that execution environment to complete the invocation. Traffic to the load balancer passes over the internet, and is secured with TLS.
I am working on a project where my main lambda function is in a VPC in private subnet and some sister lambda functions in a different VPC which are in their own private subnets. How can I go about calling these sister lambdas's from the main lambda across VPC without giving internet access to each of them via a NAT gateway linking to a public subnet which has an internet gateway attached to it.
Other AWS services that my main lambda invokes are:
1. S3
2. Dynamodb
3. Autoscaling
4. ECS
5. RDS
This can be done, but there are some complex steps involved.
First of all, when you use aws-sdk, the calls are made through the internet. To avoid this situation and access the services within the AWS network, The AWS has introduced some private VPC endpoints. I have only used S3 and API gateway private endpoints to date. But there is more type of VPC endpoints.
This is how I would do today,
setup a private API gateway API to invoke lambda - The private API's are only accessible through a private VPC endpoint for API gateway.
create a private VPC endpoint for API gateway.
setup VPC peering between the VPCs
(from the sister lambda on other VPC) invoke the API through the VPC endpoints public DNS URL
The drawback of adding an API in front of the lambda is, the API has a hard timeout of 29 seconds.
hope this helps.
Is there a way to set up api gateway endpoint for lambda functions to be only accessible internally ? I don't want it to be expose to the public.
API Gateway has released a new Private Endpoint feature, which makes this possible.
The API Gateway Private Endpoint will only be accessible from VPC and it requires setting up an Interface VPC Endpoints which will be used to access the endpoint. Also, it will be required to setup a Resource Policy to grant access to the API from your VPCs and VPC endpoints.
In order to access the API endpoint from your on premises network, you can either establish a AWS Direct Connect connection or AWS VPN Connection from your on premise to the Amazon VPC.
Unfortunately, no. At the moment API Gateway Invoke URLs are public. Making them private is not possible.
You can secure your API Gateway Rest API using either IAM roles or custom authorizers.
Yes, now you can configure AWS API Gateway with private link. follow the link, but you can only access the endpoint from VPC and if you want to access that end point from your data center you will need Direct Connect.