Configure Read-Only User for Grafana

Configure a dedicated read-only user for Grafana to improve security by preventing accidental data modifications through dashboards. This allows you to maintain separate credentials for visualization (read-only) and administration (full access), following the principle of least privilege.

QuestDB Enterprise

For QuestDB Enterprise, use the comprehensive Role-Based Access Control (RBAC) system to create granular user permissions and roles. The configuration below applies to QuestDB Open Source.

Problem: Separate Read and Write Access​

You want to:

  1. Connect Grafana with read-only credentials
  2. Prevent accidental INSERT, UPDATE, DELETE, or DROP operations from dashboards
  3. Still be able to execute DDL statements (CREATE TABLE, etc.) from the QuestDB web console

However, QuestDB's PostgreSQL wire protocol doesn't support standard PostgreSQL user management commands like CREATE USER or GRANT.

Solution: Enable the Read-Only User​

QuestDB Open Source supports a built-in read-only user that can be enabled via configuration. This gives you two users:

  • Admin user (default: admin): Full access for DDL and DML operations
  • Read-only user (default: user): Query-only access for dashboards

Configuration​

Add these settings to your server.conf file or set them as environment variables:

Via server.conf:

# Enable the read-only user
pg.readonly.user.enabled=true

# Optional: Customize username (default is "user")
pg.readonly.user=grafana_reader

# Optional: Customize password (default is "quest")
pg.readonly.password=secure_password_here

Via environment variables:

export QDB_PG_READONLY_USER_ENABLED=true
export QDB_PG_READONLY_USER=grafana_reader
export QDB_PG_READONLY_PASSWORD=secure_password_here

Via Docker:

docker run \
  -p 9000:9000 -p 8812:8812 \
  -e QDB_PG_READONLY_USER_ENABLED=true \
  -e QDB_PG_READONLY_USER=grafana_reader \
  -e QDB_PG_READONLY_PASSWORD=secure_password_here \
  questdb/questdb:latest

Using the Read-Only User​

After enabling, you have two separate users:

Admin user (web console):

  • Username: admin (default)
  • Password: quest (default)
  • Permissions: Full access - SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, ALTER
  • Use for: QuestDB web console, administrative tasks, schema changes

Read-only user (Grafana):

  • Username: grafana_reader (or whatever you configured)
  • Password: secure_password_here (or whatever you configured)
  • Permissions: SELECT queries only
  • Use for: Grafana dashboards, monitoring tools, analytics applications
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