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Microservicessystem_design~12 mins

Container networking in Microservices - Architecture Diagram

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System Overview - Container networking

This system shows how containers communicate within a microservices environment. It ensures that services inside containers can talk to each other and to the outside world securely and efficiently. Key requirements include service discovery, network isolation, and load balancing.

Architecture Diagram
User
  |
  v
Ingress Controller (Load Balancer)
  |
  v
Service Mesh Proxy (Sidecar)
  |
  +-----------------------------+
  |                             |
  |  Container A <--> Container B|
  |  (Microservice A)  (Microservice B)
  |                             |
  +-----------------------------+
       |                  |
       v                  v
   Container Network   Container Network
       |                  |
       v                  v
   Network Plugin (CNI)  Network Plugin (CNI)
       |                  |
       +------------------+
              |
              v
         Host Network
Components
User
client
Initiates requests to the microservices system
Ingress Controller (Load Balancer)
load_balancer
Distributes incoming traffic to appropriate services inside the cluster
Service Mesh Proxy (Sidecar)
service_proxy
Manages service-to-service communication, security, and observability
Container A (Microservice A)
service
Runs one microservice instance inside a container
Container B (Microservice B)
service
Runs another microservice instance inside a container
Network Plugin (CNI)
network_plugin
Provides networking capabilities and IP management for containers
Host Network
host_network
Underlying network of the physical or virtual machine hosting containers
Request Flow - 8 Hops
User → Ingress Controller (Load Balancer)
Ingress Controller (Load Balancer) → Service Mesh Proxy (Sidecar) in Container A
Service Mesh Proxy (Sidecar) in Container A → Service Mesh Proxy (Sidecar) in Container B
Service Mesh Proxy (Sidecar) in Container B → Container B (Microservice B)
Container B (Microservice B) → Service Mesh Proxy (Sidecar) in Container B
Service Mesh Proxy (Sidecar) in Container B → Service Mesh Proxy (Sidecar) in Container A
Service Mesh Proxy (Sidecar) in Container A → Ingress Controller (Load Balancer)
Ingress Controller (Load Balancer) → User
Failure Scenario
Component Fails:Network Plugin (CNI)
Impact:Containers lose network connectivity, service-to-service communication fails, and external requests cannot reach containers.
Mitigation:Use redundant network plugins or fallback to host network mode; monitor plugin health and restart plugin components automatically.
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for distributing incoming user requests to the correct microservice?
AService Mesh Proxy (Sidecar)
BNetwork Plugin (CNI)
CIngress Controller (Load Balancer)
DHost Network
Design Principle
This architecture shows how container networking uses layered components to isolate and manage communication. The load balancer handles external traffic, while service mesh proxies manage secure and observable service-to-service calls. Network plugins provide the underlying connectivity, ensuring containers can communicate within the host network.