Hello Simon,
I reconstructed all mailboxes but it did not help.I found that the service outages happen usually during nights.There were two backups run by cron every night which gzipped a lot of data.I disabled these CPU intensive backups and the cyrus processes are stable for more than 6 days now. I can understand why pop3s, imaps request timed out during the CPU sensitive backups but I still don't understand why only restart helped. I tried to run the backups with lower priority using nice but it did not help.
Thanks for your help.
Regards, Gyorgy
Idézet (Gyorgy Knyihar <cyrus123@xxxxxxxxx>):
> Hello Simon,>> Thank you very much for your help.> Please see my answers below.>> Idezet (Simon Matter <simon.matter@xxxxxxxxx>):>>>> Hello Simon,>>>>>> I tried you suggestion and there are no more>>> "Sep 3 07:45:59 srv1 deliver[20650]:>>> connect(/var/lib/imap/socket/lmtp) failed: Connection refused">>> messages appearing in the error log file.>>>>>> Many thanks for your help.>>>>>> I run postfix chrooted so a hardlink pointing to>>> /var/lib/imap/socket/lmtp was required in>>> /var/spool/postfix/var/lib/imap/socket directory. This needs to be>>> refreshed every time cyrus is restarted.>>>> It's much easier to make lmtp not chrooted. Simply remove the chroot>> option from lmtp service in master.cf. I don't think that's a big security>> problem.>> Yes, this sounds easier, thanks.>>>>>>>>> But my collegaues told me that this is not the only problem. Cyrus>>> pop3, pop3s, imap and imaps services become unavailable time to time.>>> And only restart helps.>>> Delivery from postfix to cyrus mailboxes via this new setup (direct>>> lmtp) is OK during the outage of pop3, pop3s, imap, imaps service. The>>> services don't die at the same time. Sometimes imap dies but pop3>>> still works. Restart helps. It is really strange. It was a stable>>> system before and nothing was changed. I could find only the following>>> errormessages in the log files:>>>>>> Sep 8 01:35:00 srv1 pop3s[15591]: Fatal error: tls_start_servertls()>>> failed>>> Sep 8 01:37:09 srv1 imaps[15687]: Fatal error: tls_start_servertls()>>> failed>>>> Do you only have problems with pop3s and imaps, or also with pop3 and>> imap? If it's only SSL/TLS, there yould be a problem with /dev/random and>> you should try using /dev/urandom instead. Otherwise it could be that one>> or more of your cyrus databases are corrupt. Did you try a reconstruct on>> all you mailboxes?>> It is a problem with pop3 and imap as well. I monitor the services> with nagios running on the same machine and there are problems with> all services.> Time to time these services die and only restart helps.> I haven't tried to reconstruct mailboxes yet. I will try.> I don't know if it does matter but lot of users are over their quota.>> Thanks a lot for your help.>> Regards, Gyorgy>>>>> Simon>>>>>>>> and>>>>>> Sep 8 02:17:47 srv1 cyrus-master[20423]: pop3 has -5 workers?!?>>>>>> There are many of such messages. I can access my mailbox using TLS>>> without any problem.>>>>>> Any help would be appreciated.>>>>>> Thanks, Gyorgy>>>>>> Idézet (Simon Matter <simon.matter@xxxxxxxxx>):>>>>>>>> Hello,>>>>>>>>>> We had a properly working postfix + cyrus-imap system till 23rd of>>>>> July. Then messages like the below one started to appear in the log>>>>> file.>>>>>>>>>> Sep 3 07:45:59 srv1 deliver[20650]:>>>>> connect(/var/lib/imap/socket/lmtp) failed: Connection refused>>>>>>>>>> The postfix log shows:>>>>>>>>>> Sep 3 07:45:59 srv1 postfix/pipe[19972]: B88D01DC8EF8: to=<xxx@>>>>> srv1.xxx.xx>, orig_to=<xxx@xxxxxx>, relay=cyrus-deliver, delay=2>>>>> 49424, status=deferred (temporary failure. Command output: couldn't>>>>> connect to l>>>>> mtpd: Connection refused_ 421 4.3.0 deliver: couldn't connect to lmtpd_>>>>> )>>>>>>>>>>>>>>> Do you have any ideas what could happen? It worked fine before.>>>>>>>>>>>>>>> cyrus.conf contains:>>>>>>>>>> # at least one LMTP is required for delivery>>>>> # lmtp cmd="lmtpd" listen="lmtp" prefork=0>>>>> lmtpunix cmd="lmtpd" listen="/var/lib/imap/socket/lmtp">>>>> prefork=5>>>>>>>>>>>>>>> postfix/master.cf contains:>>>>>>>>>> cyrus-deliver unix - n n - - pipe>>>>> user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -r ${sender} -m>>>>> ${extension} ${user}>>>>>>>>>>>>>>> postfix/main.cf contains:>>>>>>>>>> mailbox_transport = cyrus-deliver>>>>>>>> Hi,>>>>>>>> I don't know why things suddenly fail but you shouldn't use the cyrus>>>> transport anymore. You should use lmtp as a mailtransport directly. If>>>> your postfix setup isn't somehow exotic you should be able to simply>>>> switch with this config:>>>> mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp>>>>>>>> Maybe you could give it a try.>>>>>>>> Simon>>>>>>>>>>>>>>>>>>>> ---->>> Cyrus Home Page: http://cyrusimap.web.cmu.edu/>>> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki>>> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html>>>>>> ----> Cyrus Home Page: http://cyrusimap.web.cmu.edu/> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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