[Dovecot] auth: Error: net_accept() failed: Too many open files

[boyd yang]

Hi All,


I got below errors when I do some 2000 users concurrency test against
dovecot 2.1.7.

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files

Dec 23 10:18:52 auth: Error: net_accept() failed: Too many open files


I seems the auth process become the bottleneck as there is only one auth
process.


service auth-worker {

  process_limit = 1000

}

service imap-login {

  process_min_avail = 48

  service_count = 0

}

service imap {

  process_limit = 10240

  process_min_avail = 8

}

I find that the auth process does not open too many files with lsof, and my
limit is very big(1000000).

How to fix this?
Thanks!