Microservicessystem_design~12 mins

Secrets management (Vault, AWS Secrets Manager) in Microservices - Architecture Diagram

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System Overview - Secrets management (Vault, AWS Secrets Manager)

This system securely manages sensitive information like passwords, API keys, and certificates for microservices. It ensures secrets are stored safely, accessed only by authorized services, and rotated regularly to reduce risk.

Architecture Diagram

User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
Microservices Cluster
  |
  +-------------------+
  |                   |
  v                   v
Secrets Manager     Cache Layer
(Vault or AWS       (In-memory or
Secrets Manager)    Redis/Memcached)
  |
  v
Secure Storage Backend
(Database or Cloud KMS)

Components

User

client

Initiates requests to microservices

Load Balancer

load_balancer

Distributes incoming requests evenly to API Gateway instances

API Gateway

api_gateway

Routes requests to appropriate microservices and handles authentication

Microservices Cluster

service

Runs business logic and requests secrets when needed

Secrets Manager (Vault or AWS Secrets Manager)

secrets_manager

Stores and manages secrets securely with access control and auditing

Cache Layer

cache

Temporarily stores secrets to reduce latency and load on Secrets Manager

Secure Storage Backend

database

Encrypted storage for secrets managed by the Secrets Manager

Request Flow - 12 Hops

User → Load Balancer

Load Balancer → API Gateway

API Gateway → Microservices Cluster

Microservices Cluster → Cache Layer

Cache Layer → Microservices Cluster

Cache Layer → Secrets Manager

Secrets Manager → Secure Storage Backend

Secrets Manager → Cache Layer

Secrets Manager → Microservices Cluster

Microservices Cluster → API Gateway

API Gateway → Load Balancer

Load Balancer → User

Failure Scenario

Component Fails:Secrets Manager

Impact:Microservices cannot retrieve new secrets; cached secrets still available but may become stale

Mitigation:Use cache to serve secrets temporarily; implement Secrets Manager replication and failover; alert operators for quick recovery

Architecture Quiz - 3 Questions

Test your understanding

Which component is responsible for securely storing and managing secrets?

AAPI Gateway

BSecrets Manager

CCache Layer

DLoad Balancer

Design Principle

This architecture uses a dedicated Secrets Manager to centralize secret storage and access control, combined with a cache layer to reduce latency and improve availability. It separates concerns, secures sensitive data, and ensures microservices can access secrets efficiently and safely.