During a blue-green deployment, the team notices that after switching traffic, some users still reach the old environment. What is the most probable issue?

medium📝 Analysis Q7 of 15

Microservices - CI/CD for Microservices

ADNS caching causing delay in traffic routing update

BThe new environment is not running

CThe old environment was deleted too soon

DThe database schema is incompatible

Step-by-Step Solution

Solution:

Step 1: Identify cause of mixed traffic
Users reaching old environment after switch usually happens due to DNS caching delays.
Step 2: Rule out other causes
New environment running or deletion timing does not cause mixed traffic; database schema issues affect data, not routing.
Final Answer:
DNS caching causing delay in traffic routing update -> Option A
Quick Check:
Mixed traffic cause = DNS caching delay [OK]

Quick Trick: DNS caching can delay traffic switch effect [OK]

Common Mistakes:

Assuming new environment is down
Deleting old environment too early
Confusing database issues with routing

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More Microservices Quizzes

During a blue-green deployment, the team notices that after switching traffic, some users still reach the old environment. What is the most probable issue?

Step 1: Identify cause of mixed traffic

Step 2: Rule out other causes

Final Answer:

Quick Check:

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