How we fine-tuned HAProxy to achieve 2,000,000 concurrent SSL connections

This machine has 2.38 million TCP connections established, and
The amount of RAM being used is around 48 Gigabytes.

https://medium.freecodecamp.com/how-we-fine-tuned-haproxy-to-achieve-2-000-000-concurrent-ssl-connections-d017e61a4d27