Upgrade 2.2.27 to 2.3.9.2: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable

[Aki Tuomi]

Can you enable 'verbose_proctitle=yes' and maybe compare with ss -tp output?

Aki

> On 08/01/2020 11:58 Eirik Rye <rye at domeneshop.no> wrote:
> 
>  
> On 08/01/2020 10:49, Eirik Rye wrote:
> > [...]
> 
> In any case, the biggest issue is the one described in the original 
> message in this thread, where logins are periodically failing for many 
> for users:
> 
> 2020-01-08T10:54:57.436400+01:00 imap dovecot: imap-login: Error: 
> master(imap): net_connect_unix(imap) failed: Resource temporarily 
> unavailable - http://wiki2.dovecot.org/SocketUnavailable
> 2020-01-08T10:54:57.437550+01:00 imap dovecot: imap-login: Internal 
> login failure
> 
> At the same time:
> 
> ~# ps aux | grep "dovecot/imap$" | wc -l
> 6637
> ~# doveadm process status | grep "^imap " | wc -l
> 6660
> ~# cat /proc/`pidof dovecot`/limits | grep "open files"
> Max open files            32768                32768                files
> ~# doveconf -n
> [...]
> service imap-login {
>    client_limit = 2500
>    inet_listener imap {
>      port = 143
>    }
>    inet_listener imaps {
>      port = 993
>      ssl = yes
>    }
>    process_limit = 16
>    process_min_avail = 16
>    service_count = 0
>    vsz_limit = 512 M
> }
> service imap {
>    client_limit = 1
>    process_limit = 20000
> }
> 
> -- 
> Eirik