AWS - Architecture Best Practices
You deployed a multi-tier app but the application tier in the private subnet cannot connect to the database tier. What is the most likely cause?
You deployed a multi-tier app but the application tier in the private subnet cannot connect to the database tier. What is the most likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze connectivity between application and database tiers
Application tier must be allowed by database security group to connect on required ports.Step 2: Check common misconfigurations
If security group blocks inbound traffic, connection fails despite correct subnet placement.Final Answer:
The database security group does not allow inbound traffic from the application tier -> Option DQuick Check:
Security group rules control traffic between tiers [OK]
Quick Trick: Check security group rules for inter-tier traffic [OK]
Common Mistakes:
- Blaming web tier subnet for app-db connection
- Assuming public IP needed for private subnet
- Ignoring security group inbound rules
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