Learn how to configure secure connections to GCP-managed databases using service account authentication, Secret Manager, and best practices for production deployments.

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Prerequisites: Service Account Setup

Use attached service accounts for secure, key-free authentication on:
  • GCE - VMs with attached service accounts
  • GKE - Pods with Workload Identity
References: Service accounts | Best practices | ADC

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Create Service Account

  1. Go to IAM & Admin → Service Accounts
  2. Create service account named bytebase
  3. Grant roles as needed:
    • Cloud SQL Client and Cloud SQL Instance User - for Cloud SQL
    • Secret Manager Secret Accessor - for Secret Manager
  4. Note the email: bytebase@PROJECT_ID.iam.gserviceaccount.com

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Attach Service Account

Option A: GCE VM
  1. Create VM in Compute Engine
  2. Set service account: bytebase@PROJECT_ID.iam.gserviceaccount.com
  3. Set access scopes: “Allow full access to all Cloud APIs”
Option B: GKE with Workload Identity 
# Create Kubernetes service account
kubectl create serviceaccount bytebase-ksa

# Bind to Google service account
kubectl annotate serviceaccount bytebase-ksa \
  iam.gke.io/gcp-service-account=bytebase@PROJECT_ID.iam.gserviceaccount.com

# Allow impersonation
gcloud iam service-accounts add-iam-policy-binding bytebase@PROJECT_ID.iam.gserviceaccount.com \
  --role roles/iam.workloadIdentityUser \
  --member "serviceAccount:PROJECT_ID.svc.id.goog[NAMESPACE/bytebase-ksa]"
Reference: Workload Identity Deploy Bytebase on your resource - credentials are provided automatically.

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Alternative: Service Account Keys

Use only when running Bytebase outside GCP. See why to avoid service account keys.
  1. Create a service account with required roles
  2. Download the JSON key file
  3. Set environment variable: 
    -e GOOGLE_APPLICATION_CREDENTIALS=/path/to/key.json
Reference: Service account keys authentication

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Cloud SQL with IAM Authentication

Prerequisites: Service account with Cloud SQL roles.
References: IAM authentication | Configure instances

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Step 1: Configure Cloud SQL Instance

  1. In Cloud SQL, edit your instance
  2. Add flag: cloudsql_iam_authentication = on
  3. Save (SSL is enabled by default)

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Step 2: Add Service Account User

Using gcloud: 
gcloud sql users create bytebase@PROJECT_ID.iam.gserviceaccount.com \
  --instance=INSTANCE_NAME \
  --type=cloud_iam_service_account
Using Console: Instance → Users → Add User Account → Cloud IAM → Enter service account email References: MySQL | PostgreSQL

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Step 3: Connect from Bytebase

  1. Click New Instance in Bytebase
  2. Configure connection details:
    • Host: Your Cloud SQL connection name (PROJECT_ID:REGION:INSTANCE_ID)
      • Find this in Cloud SQL console → Instance details
    • Port: 3306 (MySQL) or 5432 (PostgreSQL)
    • Username:
      • MySQL: bytebase (service account name only)
      • PostgreSQL: bytebase@PROJECT_ID.iam (with project ID)
    • Authentication: Select Google Cloud SQL IAM
  3. Click Test Connection then Create

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GCP Secret Manager

Store database passwords securely in Google Cloud Secret Manager instead of Bytebase.
Prerequisites: Service account with Secret Manager Secret Accessor role.

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Step 1: Create Secret

  1. Go to Secret Manager Console
  2. Click Create Secret
  3. Enter secret name (e.g., db-password) and your database password as value
  4. Click Create and note the resource name: projects/PROJECT_ID/secrets/SECRET_NAME

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Step 2: Configure in Bytebase

  1. In your database instance settings, find the password field
  2. Click the key icon to use external secret
  3. Select GCP Secret Manager
  4. Enter the secret resource name from Step 1
  5. Test connection and save

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Private IP and VPC Peering

For Cloud SQL instances using private IP:

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Step 1: Configure VPC Peering

  1. Enable Service Networking API
  2. Reserve IP range for services: 
    gcloud compute addresses create google-managed-services-default \
  --global \
  --purpose=VPC_PEERING \
  --prefix-length=16 \
  --network=default
  3. Create private connection: 
    gcloud services vpc-peerings connect \
  --service=servicenetworking.googleapis.com \
  --ranges=google-managed-services-default \
  --network=default
Reference: Private IP configuration

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Step 2: Connect from Bytebase

  1. Deploy Bytebase in the same VPC or a peered VPC
  2. Use the private IP address for the Cloud SQL instance
  3. Configure connection as normal with private IP

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Database-Specific Configuration

For specific database types running on GCP:

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Best Practices

  1. Use Service Accounts over Keys: Always prefer attached service accounts
  2. Enable Private IP: Use VPC peering for enhanced security
  3. Use Secret Manager: Centralize password management
  4. Follow Least Privilege: Grant only necessary IAM roles
  5. Enable Audit Logging: Monitor database access with Cloud Audit Logs

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Troubleshooting

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Connection Refused

  • Verify Cloud SQL instance allows connections from your IP/network
  • Check authorized networks configuration
  • Ensure VPC peering is properly configured for private IP

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IAM Authentication Failed

  • Verify service account has Cloud SQL Instance User role
  • Check database user was created with correct type
  • Ensure cloudsql_iam_authentication flag is enabled

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Secret Manager Access Denied

  • Verify service account has Secret Manager Secret Accessor role
  • Check secret resource name is correct
  • Ensure secret exists in the correct project

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Private IP Connection Issues

  • Verify VPC peering is active
  • Check firewall rules allow traffic
  • Ensure Bytebase is deployed in the correct VPC