What is the best approch to setup custom domain with static IP for AppEngine

Question

I had done an investigation on below

1. Adding custom domain through AppEngine settings - Doesn\'t seem to be static IP, it uses Google NS.
2. Setting up VM

Answer 1

Static IP for AppEngine/Cloud Functions can be achieved by HTTPS Load Balancer with "Serverless Network End Group" backend.

LB also helps multi-region serving for AppEngine and other serverless components.

This is similar to Internet NEG with HTTPS LB, serverless NEG can be mapped to Google internal services like Cloud run/CF, AppEngine. It was also possible to map multiple AppEngine services from the same GCP project.

I was able to gain early access to serverless NEG on my project and test on my side. I will update this post when Serverless NEG available for public access.

Edit (7/7/2020): Serverless NEG is available in Beta now and is available for everyone to access, See

Serverless network endpoint groups overview

Setting up serverless NEGs