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ALTo connect AWS Lambda to an RDS database in a VPC, follow these steps:
1. VPC Configuration:
- Ensure your RDS is in private subnets of a VPC.
- Subnets must have a route to a NAT Gateway (for internet access, if needed).
2. Security Groups:
- Assign a security group to Lambda that allows outbound access.
- RDS security group must allow inbound on the DB port (e.g., 3306 for MySQL) from Lambda’s security group.
3. Lambda Configuration:
- In Lambda settings, configure VPC access:
- Choose the same VPC.
- Choose private subnets (with NAT access if Lambda needs internet).
- Assign the proper security group.
4. IAM Role:
- Attach basic Lambda execution role + any RDS-specific permissions (if using RDS Proxy or Secrets Manager).
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