about imap-login: Error and imap: Error after Version-UP

['Aki Tuomi']

You need to configure stats service client limit and imap service client limit. Those are different services than imap-login service.

Aki

> On 17/11/2020 01:28 森川　孝司 <morikawa-k6 at itec.hankyu-hanshin.co.jp> wrote:
> 
>  
> Aki-san
> 
> I have already seen that page.
> Is the setting method wrong?
> 
> Is there any other tuning point?
> 
> morikawa
> -----Original Message-----
> From: Aki Tuomi [mailto:aki.tuomi at open-xchange.com] 
> Sent: Monday, November 16, 2020 8:52 PM
> To: 森川　孝司 <morikawa-k6 at itec.hankyu-hanshin.co.jp>; dovecot at dovecot.org
> Subject: Re: about imap-login: Error and imap: Error after Version-UP
> 
> 
> > On 16/11/2020 13:44 森川　孝司 <morikawa-k6 at 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