How do you do loadbalance in nginx depending on how busy the backends are?

Question

Nginx

I look at the loadbalance in nginx, everything is rotated there through round robin + backends that are not responding are excluded.
Is it possible to check server load by cpu for example.

Answer 1

github.com/gnosek/nginx-upstream-fair

Answer 2

It would be more effective to ask in the mailing list. But offhand, I note that they usually use the built-in perl.

Answer 3

In nginx, this is not very well implemented. I advise you to try the scheme
nginx->haproxy->haproxy
backends are more advanced in terms of fair balancing

Answer 4

And if HttpLuaModule instead of UpstreamFair ?

Answer 5

Nginx can route not only by round-robin, but also by the number of connections, taking into account weights. Which quite well solve the problem of “give a request to the least loaded backend”.
nginx.org/r/least_conn/ru