[Solved] Why does Istio use a sidecar proxy pattern instead of modifying application code directly? — Ans: To separate networking logic from business logic without changing app code | Microservices

Microservices - Service Mesh

Why does Istio use a sidecar proxy pattern instead of modifying application code directly?

ATo allow applications to run only on specific nodes

BTo separate networking logic from business logic without changing app code

CTo increase application startup time for better stability

DTo reduce the number of containers running in the cluster

Step-by-Step Solution

Solution:

Step 1: Understand sidecar proxy purpose
Istio uses sidecars to handle networking features like routing and security without touching app code.
Step 2: Evaluate other options
Sidecars do not reduce container count, increase startup time intentionally, or restrict node scheduling.
Final Answer:
To separate networking logic from business logic without changing app code -> Option B
Quick Check:
Sidecar pattern = separate networking from app code [OK]

Quick Trick: Sidecars keep app code clean by handling networking separately [OK]

Common Mistakes:

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Why does Istio use a sidecar proxy pattern instead of modifying application code directly?