Service Boundaries

Architecture

Implement service boundaries using dedicated access policies per microservice:

• Per-Service Policies that grant access only to owned resources
• Inter-Service Policies for explicit service-to-service communication
• Shared Resource Policies for common infrastructure components

When to Use

This pattern is ideal when you need:

• Clear separation of concerns in microservices architectures
• To prevent one compromised service from accessing others
• Independent deployment and scaling of services
• Compliance with zero-trust security models

Considerations

• Each service should have its own IAM role and policy
• Use naming conventions to enable resource restrictions
• Document inter-service dependencies explicitly
• Consider using AWS PrivateLink for network-level isolation