16 Nov
2020
16 Nov
'20
6:51 a.m.
On 16/11/2020 13:44 森川 孝司 <morikawa-k6@itec.hankyu-hanshin.co.jp> wrote:
We have upgraded dovecot from 2.0.9 (centos6) to 2.2.36 (centos8).
If more than 1000 users log in, the following error will occur.
Nov 16 11:33:00 xxxxxxxx dovecot[1361]: imap-login: Error: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable - http://wiki2.dovecot.org/SocketUnavailable (client-pid=1362, client-id=129834, rip=10.10.10.10, created 551 msecs ago, received 0/4 bytes) Nov 16 11:30:26 xxxxxxxx dovecot[1361]: imap: Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: Resource temporarily unavailable
I set the following because I thought it was a problem with the number of connections, but I get an error.
service imap-login { service_count=0 client_limit = $default_client_limit process_min_avail = 4 process_limit = $default_process_limit vsz_limit = 1G }
limits.conf
- soft nofile 4096
- hard nofile 4096
cat /proc/sys/net/core/somaxconn
4096
Is there any other tuning point? Where should I look?
https://wiki.dovecot.org/SocketUnavailable
Aki