Cloud SQL Connection Failure Fix from GKE

Reconnect GKE workloads to Cloud SQL by correcting network, proxy, or IAM settings.

April 19, 2026•1 min read

#gcp#cloud-sql#gke

Problem

Application pods cannot open database sessions to Cloud SQL.

Root Cause

The Cloud SQL Auth Proxy is missing, the private IP route is blocked, or the workload identity binding is incomplete.

Fix

Code

kubectl describe pod api-db-proxy -n data
gcloud sql instances describe devfixer-db
gcloud iam service-accounts add-iam-policy-binding db-workload@devfixer-prod.iam.gserviceaccount.com \
  --member="serviceAccount:devfixer-prod.svc.id.goog[data/api]" \
  --role="roles/iam.workloadIdentityUser"
kubectl rollout restart deployment/api -n data

Result

Database connections succeed and application startup errors clear.

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