How to get rid of too many open files error?

Question

linux

Write a powerful parser in Golang. Recently, errors "dial tcp: lookup localhost: too many open files" began to fall
Ulimit increased, connections in go are all closed, what else could be the problem?

Answer 1

How did you increase ulimit? Hopefully through /etc/security/limits.conf?
And there is another utilitylsof -p 1753

Answer 2

is on the Internet in the first line https://winitpro.ru/index.php/2019/11/19/oshibka-t...
may differ slightly from the OS

Answer 3

I think you should look at maxIdleConnsPerHost