How to configure a Lambda function to access resources in a VPC

Question

Hi Guys,

When building an application with AWS Lambda, I need to host my Lambda function in a VPC. The reason for this is because the Lambda function will use other resources that aren’t accessible from the public internet, such as a relational database or Redis instance. But how can I do that, can anyone suggest?

Answer 1

Hi@akhtar,

You can configure a Lambda function to connect to private subnets in a virtual private cloud (VPC) in your AWS account. Use Amazon Virtual Private Cloud (Amazon VPC) to create a private network for resources such as databases, cache instances, or internal services. Connect your function to the VPC to access private resources during execution.

To connect a function to a VPC

1. Open the Lambda console Functions page.

2. Choose a function.

3. Under VPC, choose Edit.

4. For VPC connection, choose Custom VPC.

5. Choose a VPC, subnets, and security groups.

6. Choose Save.

When you connect a function to a VPC, Lambda creates an elastic network interface for each combination of the security group and subnet in your function's VPC configuration. This process can take about a minute.