To remove database passwords from your Lambda setup, configure end-to-end IAM authentication with Amazon RDS Proxy. Lambda authenticates to the proxy with IAM, and the proxy authenticates to the database with IAM—so the proxy does not need database-password secrets in AWS Secrets Manager. This is distinct from standard IAM authentication, which uses IAM only between Lambda and the proxy and still relies on a stored database password for the proxy-to-database connection.
Choose end-to-end IAM, not just “IAM authentication”
RDS Proxy sits between your Lambda function and its database. It pools and shares database connections to help applications handle changing connection demand, and can improve resilience by connecting to a standby database while preserving application connections. Those capabilities do not guarantee a particular performance gain; results depend on your workload.
The phrase “IAM authentication with RDS Proxy” can describe two different configurations:
| Configuration | Lambda to proxy | Proxy to database | Database-password secret required? |
|---|---|---|---|
| Standard IAM authentication | IAM | Password retrieved by the proxy from Secrets Manager | Yes |
| End-to-end IAM authentication | IAM | IAM | No |
If your goal is to stop storing database credentials, standard IAM is not the complete solution. AWS documents standard IAM and end-to-end IAM as separate authentication approaches; standard IAM uses a Secrets Manager secret for each database account the proxy uses. See Amazon RDS Proxy and Configuring IAM authentication for RDS Proxy.
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Check engine, Region, and network support first
RDS Proxy support and authentication options depend on the database engine, engine version, and AWS Region. Check the current RDS Proxy availability by Region and engine for the deployment you intend to use.
For the documented Lambda connectivity pattern, place the function and database in the same VPC. AWS lists RDS for MySQL, MariaDB, PostgreSQL, and SQL Server, as well as Aurora MySQL and Aurora PostgreSQL, in its Lambda connectivity guidance; that does not mean every engine version or Region supports every proxy feature. Review Using AWS Lambda with Amazon RDS and the live proxy compatibility information.
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- Confirm the selected database engine and version support RDS Proxy and end-to-end IAM in your Region.
- Check security-group rules for traffic from Lambda to the proxy and from the proxy to the database.
- Plan for the proxy endpoint as the application’s database host.
Configure end-to-end IAM authentication
The exact database-user setup and token-generation steps vary by engine and runtime. Use AWS’s instructions for the engine you run rather than treating a SQL command or client example for another engine as universal.
- Configure a database user for IAM authentication. Create or adapt the database account using the engine-specific instructions in Configuring IAM authentication for RDS Proxy.
- Set the proxy’s default authentication scheme to
IAM_AUTH. Configure the proxy for end-to-end IAM and associate the required proxy IAM role, following the same AWS setup guide. - Grant narrowly scoped connect permissions. The relevant IAM identity needs
rds-db:connectaccess for the intended database user. Scope the resource to the correct account, Region, database resource identifier, and username; do not copy sample identifiers as if they applied to your deployment. - Give the Lambda execution role the required permission. Its policy must authorize connection as the intended database user through the proxy. Use the engine-specific guidance for the resource ARN and authentication-token generation steps.
- Point the client at the proxy endpoint and enable TLS/SSL. Use a compatible client library and AWS’s engine-specific connection instructions. AWS explicitly requires TLS/SSL when connecting to a proxy using IAM authentication; see Connecting to a database through RDS Proxy.
Verify the connection before removing old secrets
Test the complete path before deleting or disabling credentials used by the previous setup. Confirm that the proxy is available, Lambda can reach its endpoint, IAM authentication succeeds, and the application’s normal queries work.
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If you are converting a proxy from standard IAM to end-to-end IAM, follow AWS’s migration procedure, Moving from standard IAM authentication to end-to-end IAM authentication for RDS Proxy. AWS says to verify proxy availability and DefaultAuthScheme before proceeding. Keep any existing secret until the new path is confirmed and the migration steps permit its removal.
What this setup does—and does not—solve
- It removes the need for a database-password secret in Secrets Manager for this proxy authentication design. It does not mean the application can connect without network access, a correctly configured database user, or IAM permissions.
- It centralizes authorization in IAM across both connection hops. A broad
rds-db:connectpolicy can grant more access than intended, so restrict it to the specific database account and resource. - It adds a managed connection layer. Pooling and resilience features may help, but the documentation does not establish a universal speed-up or cost benefit for every workload. Review current RDS Proxy quotas and limitations for operational constraints.
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