You just pushed a new service into Azure. It talks to a Pub/Sub topic in Google Cloud. Then someone asks who approved that connection, and everyone in the room pauses. That’s the moment you realize identity and access in a multi-cloud setup are not something you can wing.
Azure Resource Manager (ARM) defines and deploys resources declaratively inside Azure, from virtual networks to secrets in Key Vault. Google Pub/Sub moves messages instantly across distributed systems without you having to build a queue yourself. When combined, they create a steady pipeline between infrastructure automation and messaging delivery. But to make Azure Resource Manager Google Pub/Sub actually safe and reliable, you need to nail access control and workflow repeatability.
Here’s the short version: Azure authentication meets Google message routing. Your ARM templates can reference Pub/Sub endpoints that act as real-time data receivers or triggers for downstream services. It’s a cross-cloud handshake managed through identities and permissions, not duct tape and retries.
Integration workflow explained
You start with identity federation. Azure provides enterprise-grade RBAC and managed identities, while Google Pub/Sub supports service accounts and IAM policies. Linking the two means defining a trust boundary: which Azure resource or identity can publish or consume messages on the Pub/Sub side. That mapping occurs through OIDC claims or workload identity federation so you skip long-lived keys and human error. The flow is simple—Azure deploys, sends events, Pub/Sub receives or routes them, and both sides validate tokens instantly.
Quick answer: how do you connect ARM to Pub/Sub?
Create a service identity in Azure with permissions scoped to the resources sending messages. Then configure corresponding Pub/Sub IAM roles for that identity using Google’s workload federation. No need for shared secrets, just assign roles based on real deployment intent.