If you are migrating to serverless with Google Cloud Run from your on-premises datacenters, or Google Kubernetes Engine (GKE) clusters, you might notice that Cloud Run has a slightly different networking stack than GCE/GKE.
When accessing endpoints that require “IP whitelisting” (such as Cloud Memorystore, or something on your corporate network) from Cloud Run, you can’t easily have static IPs for your Cloud Run applications. This is because currently you can’t configure Cloud NAT or Serverless VPC Access yet.
Until we support these on Cloud Run, I want to share a workaround (with example code) that involves routing the egress traffic of a Cloud Run application through a GCE instance with a static IP address. Read More →