GCP - Cloud Load Balancing
A company wants to ensure their web app stays available even if one server fails. They have three servers behind a load balancer. Which setup best achieves this goal?
A company wants to ensure their web app stays available even if one server fails. They have three servers behind a load balancer. Which setup best achieves this goal?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand high availability requirements
To stay available if one server fails, traffic must shift automatically to healthy servers in different zones.Step 2: Evaluate options for failover
Use a load balancer with health checks and three backend servers in different zones. uses load balancer with health checks and multi-zone servers, ensuring automatic failover and availability.Step 3: Reject other options
Use a single server with a backup database. lacks redundancy; Use three servers without a load balancer and rely on DNS round robin. lacks health checks and proper failover; Use a load balancer but disable health checks to avoid false failures. risks undetected failures by disabling health checks.Final Answer:
Use a load balancer with health checks and three backend servers in different zones. -> Option AQuick Check:
Health checks + multi-zone = high availability [OK]
Quick Trick: Health checks + multi-zone servers ensure uptime [OK]
Common Mistakes:
- Disabling health checks thinking it helps
- Relying on DNS round robin alone
- Using single server for high availability
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