Grant Internet Access to a VPC Lambda Function
If your Lambda function needs to access private VPC resources (for example, an Amazon RDS DB instance or Amazon EC2 instance), you must associate the function with a VPC. If your function also requires internet access (for example, to reach a public AWS service endpoint), your function must use a NAT gateway or instance. For more information, see
To add a VPC configuration to your Lambda function, you must associate it with at least one subnet. If the function needs internet access, you need to follow two rules:
- The function should only be associated with private subnets.
- Your VPC should contain a NAT gateway or instance in a public subnet.
Whether a subnet is public or private depends on its route table. Every route table has a default route, which determines the next hop for packets that have a public destination.
- Private subnet: the default route points to a NAT gateway (nat-...) or NAT instance (eni-...).
- Public subnet: the default route points to an internet gateway (igw-...).
If your VPC already has a public subnet (with a NAT) and one or more private subnets for your Lambda function, then you only need to follow the steps in “Configure your function".
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