AWS Lambda using firebase-admin initializeApp timeout

Question

I use Lambda to Firebase message. I ref this. But the lambda function still timeout because it cannot connect to google server.

Handler.js

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Answer 1

After a couple hours struggling, I finally find the reason. Because my Lambda using VPC to connect RDS and the network interface of VPC only have private IP.

AWS document:

When you add VPC configuration to a Lambda function, it can only access resources in that VPC. If a Lambda function needs to access both VPC resources and the public Internet, the VPC needs to have a Network Address Translation (NAT) instance inside the VPC.

So I need to create NAT inside the VPC. I follow this Blog and problem solved.