Hello, What is the good rule of thumbs for setting the number of keepalive connections to an upstream group?
1. https://www.nginx.com/blog/performance-tuning-tips-tricks/ in this blog, the writer seems to recommend a constant value of 128, no real explanation why it would fit whatever the number of servers in the upstream 2. https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive the upstream module doc seems to recommend a rule like 16 times the number of servers in the upstream, as we have two examples with respectively keepalive 32 for 2 upstream servers and keepalive 16 for 1 upstream server 3. https://www.nginx.com/blog/avoiding-top-10-nginx-configuration-mistakes/#no-keepalives in this blog, the writer recommends a rule of 2 times the number of servers in the upstream I used to follow rule of item 3 as it comes with a somewhat good explanation, but it does not seem to be largely accepted. What could explain such a divergence between several sources? What would you recommend please? Regards, Sébastien.
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