Behind the balancer

  • Build
  • Level 14 of 41
  • Scale

Difficulty 2 of 5

Three app replicas are ready. One fails for ten seconds. Use at most one added part. Keep availability above 99.5 percent, and keep p99 below 200 ms.

Play level

HTTP/2Users1,000 req/sAPI server0.5 vCPU · 1 GBAPI server0.5 vCPU · 1 GBAPI server0.5 vCPU · 1 GB
HTTP/2Users1,000 req/sAPI serverAPI serverAPI server
The board at the start of the level
One balancer, many serversDrag or use arrow keys to add or remove servers

5 servers · 72% busy · p99 66 ms

Goals and limits

p99 latency
under 200 ms
Availability
at least 99.5%
Monthly cost
under 100 USD/mo
Parts you can add
Load balancer (L7), Load balancer (L4)
Part limit
1
Traffic
1,000 req/s

Concepts

How players did

Player results load from the server.

All levels