kubectl apply is too powerful. It’s time to gate your GKE cluster. 🛡️🔐

By default, Kubernetes will happily try to run any container image you throw at it. From any registry. From anyone. In a modern threat landscape, this "trust by default" model is a massive security gap. We need to know cryptographically that the code running in production was built by our trusted CI/CD pipeline, scanned for vulnerabilities, and hasn't been tampered with since.

The solution? Google Cloud Binary Authorisation. It acts as a deploy-time gatekeeper for GKE, rejecting any image that doesn't hold a valid, verifiable "signature" from your trusted build system. I’ve published an implementation guide on securing the software supply chain from Artifact Registry to GKE.

In this article, I cover: ✅ The Trust Chain: Establishing a Root of Trust using Cloud KMS asymmetric keys. ✅ The "Signer": configuring Cloud Build to automatically attest to images post-build. ✅ The Gatekeeper: Writing a GKE admission policy that blocks unsigned images by default. ✅ The "Break Glass": How to bypass controls during emergencies (and audit it instantly).

If SLSA compliance or Supply Chain Security is on your 2026 roadmap, this architecture is the implementation baseline.

Read the full guide here: https://lnkd.in/eA-z5uZw

#GoogleCloud #GKE #Kubernetes #DevSecOps #SupplyChainSecurity #BinaryAuthorization #CloudSecurity #SRE