Service unavailable, lots of idle dovecot-login processes
Hi,
Web search turned no results to this problem:
We have a small site running private e-mail for maybe 12 people, dovecot is used by Postfix-SASL and IMAP clients.
PROBLEM: When starting dovecot, after a few hours, IMAP clients are no longer able to connect. Thunderbird indicates that connection is refused.
On the server, we see 100 dovecot/imap-login processes. This is the process limit. If we increase the process limit to 200, same thing, we survive a few hours longer but eventually we're seeing 200 imap-login processes and rejected connections.
When listing TCP connections via lsof, there are only around 30 connections open to IMAP and we have exactly the same amount of dovecot/imap processes. These connections are held by 30 dovecot/imap-login processes.
The other 70 dovecot/imap-login processes seem to do nothing. They're all sitting in "epoll_wait(14," according to strace but don't have TCP connections open.
The only way out of this that we have found is re-starting dovecot every few hours.
BTW, service_count = 1 for improved security. Dovecot Version: 2.3.4.1 (f79e8e7e4)
Interestingly we were using nearly the same config on our old server with 2.2.13 and did not see this issue.
Any ideas how to solve that properly?
Thank you, Wolfgang
On 02/02/2021 14:59 Wolfgang <adminkram@tripelspark.de> wrote:
Hi,
Web search turned no results to this problem:
We have a small site running private e-mail for maybe 12 people, dovecot is used by Postfix-SASL and IMAP clients.
PROBLEM: When starting dovecot, after a few hours, IMAP clients are no longer able to connect. Thunderbird indicates that connection is refused.
On the server, we see 100 dovecot/imap-login processes. This is the process limit. If we increase the process limit to 200, same thing, we survive a few hours longer but eventually we're seeing 200 imap-login processes and rejected connections.
When listing TCP connections via lsof, there are only around 30 connections open to IMAP and we have exactly the same amount of dovecot/imap processes. These connections are held by 30 dovecot/imap-login processes.
The other 70 dovecot/imap-login processes seem to do nothing. They're all sitting in "epoll_wait(14," according to strace but don't have TCP connections open.
The only way out of this that we have found is re-starting dovecot every few hours.
BTW, service_count = 1 for improved security. Dovecot Version: 2.3.4.1 (f79e8e7e4)
Interestingly we were using nearly the same config on our old server with 2.2.13 and did not see this issue.
Any ideas how to solve that properly?
Thank you, Wolfgang
Hi!
Can you provide output of doveconf -n? Also, would it be possible to try out with latest version at https://repo.dovecot.org?
Aki
On 02 Feb 2021, at 05:59, Wolfgang <adminkram@tripelspark.de> wrote:
hen listing TCP connections via lsof, there are only around 30 connections open to IMAP and we have exactly the same amount of dovecot/imap processes. These connections are held by 30 dovecot/imap-login processes.
The other 70 dovecot/imap-login processes seem to do nothing. They're all sitting in "epoll_wait(14," according to strace but don't have TCP connections open.
Have you tried reducing the number from 100 to, say, 30?
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
-- I draw the line at 7 unreturned phone calls.
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
Hi,
Sorry, the problem is back! Not solved, again no change except that I lowered the limits again and restarted dovecot. Here is what it looks like:
lsof -a -i4 -i6 -itcp | fgrep imap-logi | wc 9
--> There are 9 TCP connections to imap-login.
ps aux | fgrep imap-login | wc 81 ps aux | fgrep imap | wc 90
--> There are 90-81 = 9 IMAP worker processes (OK) and 81 imap-login processes (not OK). Thunderbird cannot connect again.
ps auxf | fgrep dove root 28118 0.0 0.0 4200 2752 ? Ss Feb03 0:02 /usr/sbin/dovecot -F dovecot 28138 0.0 0.0 4176 2224 ? S Feb03 0:01 \_ dovecot/anvil root 28139 0.0 0.0 4172 2436 ? S Feb03 0:00 \_ dovecot/log root 28140 0.0 0.0 6764 4636 ? S Feb03 0:05 \_ dovecot/config dovecot 28143 0.0 0.0 5360 3584 ? S Feb03 0:01 \_ dovecot/stats dovenull 28206 0.0 0.0 8200 4652 ? S Feb03 0:02 \_ dovecot/imap-login USER2 28207 0.0 0.0 6356 3988 ? S Feb03 0:02 \_ dovecot/imap dovenull 28234 0.0 0.0 8200 4712 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28235 0.0 0.0 6356 2924 ? S Feb03 0:02 \_ dovecot/imap dovenull 28275 0.0 0.0 8200 4716 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28276 0.0 0.0 9416 7308 ? S Feb03 0:03 \_ dovecot/imap dovenull 19673 0.0 0.0 8212 6380 ? S Feb04 0:00 \_ dovecot/imap-login USER3 19674 0.0 0.0 14220 7680 ? S Feb04 0:01 \_ dovecot/imap dovenull 21688 0.0 0.0 8200 6416 ? S Feb04 0:01 \_ dovecot/imap-login USER2 21690 0.0 0.0 9604 8504 ? S Feb04 0:01 \_ dovecot/imap dovenull 22398 0.0 0.0 8200 6440 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22400 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22593 0.0 0.0 8200 6292 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22595 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22814 0.0 0.0 8200 6324 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22816 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23026 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23028 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login .......(skipped some lines of imap-login)........ dovenull 23179 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23181 0.0 0.0 8200 6368 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23421 0.0 0.0 8200 6284 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23423 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23611 0.0 0.0 8200 6380 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23613 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23797 0.0 0.0 8200 6464 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23799 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24029 0.0 0.0 8200 6300 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24031 0.0 0.0 8200 6188 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24205 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24207 0.0 0.0 8200 6320 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 5628 0.0 0.0 8212 6408 ? S 08:59 0:00 \_ dovecot/imap-login USER1 5629 0.0 0.0 7844 6460 ? S 08:59 0:00 \_ dovecot/imap optores 5630 0.0 0.0 6356 4444 ? S 08:59 0:00 \_ dovecot/imap USER1 5631 0.0 0.0 6372 4568 ? S 08:59 0:00 \_ dovecot/imap dovenull 6373 0.0 0.0 8200 6224 ? S 09:43 0:00 \_ dovecot/imap-login USER1 6375 0.0 0.0 7052 5900 ? S 09:43 0:00 \_ dovecot/imap
The config is the same as last time except for this:
auth_worker_max_count = 100 default_process_limit = 80
Which should be more than enough.
Any ideas? Wolfgang
On 2/3/21 8:19 PM, Wolfgang wrote:
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
Can you set
verbose_proctitle = yes
this should provide more information what the process is up to.
Can you also check your logs?
Aki
On 05/02/2021 11:46 Wolfgang <adminkram@tripelspark.de> wrote:
Hi,
Sorry, the problem is back! Not solved, again no change except that I lowered the limits again and restarted dovecot. Here is what it looks like:
lsof -a -i4 -i6 -itcp | fgrep imap-logi | wc 9
--> There are 9 TCP connections to imap-login.
ps aux | fgrep imap-login | wc 81 ps aux | fgrep imap | wc 90
--> There are 90-81 = 9 IMAP worker processes (OK) and 81 imap-login processes (not OK). Thunderbird cannot connect again.
ps auxf | fgrep dove root 28118 0.0 0.0 4200 2752 ? Ss Feb03 0:02 /usr/sbin/dovecot -F dovecot 28138 0.0 0.0 4176 2224 ? S Feb03 0:01 \_ dovecot/anvil root 28139 0.0 0.0 4172 2436 ? S Feb03 0:00 \_ dovecot/log root 28140 0.0 0.0 6764 4636 ? S Feb03 0:05 \_ dovecot/config dovecot 28143 0.0 0.0 5360 3584 ? S Feb03 0:01 \_ dovecot/stats dovenull 28206 0.0 0.0 8200 4652 ? S Feb03 0:02 \_ dovecot/imap-login USER2 28207 0.0 0.0 6356 3988 ? S Feb03 0:02 \_ dovecot/imap dovenull 28234 0.0 0.0 8200 4712 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28235 0.0 0.0 6356 2924 ? S Feb03 0:02 \_ dovecot/imap dovenull 28275 0.0 0.0 8200 4716 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28276 0.0 0.0 9416 7308 ? S Feb03 0:03 \_ dovecot/imap dovenull 19673 0.0 0.0 8212 6380 ? S Feb04 0:00 \_ dovecot/imap-login USER3 19674 0.0 0.0 14220 7680 ? S Feb04 0:01 \_ dovecot/imap dovenull 21688 0.0 0.0 8200 6416 ? S Feb04 0:01 \_ dovecot/imap-login USER2 21690 0.0 0.0 9604 8504 ? S Feb04 0:01 \_ dovecot/imap dovenull 22398 0.0 0.0 8200 6440 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22400 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22593 0.0 0.0 8200 6292 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22595 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22814 0.0 0.0 8200 6324 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22816 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23026 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23028 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login .......(skipped some lines of imap-login)........ dovenull 23179 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23181 0.0 0.0 8200 6368 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23421 0.0 0.0 8200 6284 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23423 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23611 0.0 0.0 8200 6380 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23613 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23797 0.0 0.0 8200 6464 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23799 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24029 0.0 0.0 8200 6300 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24031 0.0 0.0 8200 6188 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24205 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24207 0.0 0.0 8200 6320 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 5628 0.0 0.0 8212 6408 ? S 08:59 0:00 \_ dovecot/imap-login USER1 5629 0.0 0.0 7844 6460 ? S 08:59 0:00 \_ dovecot/imap optores 5630 0.0 0.0 6356 4444 ? S 08:59 0:00 \_ dovecot/imap USER1 5631 0.0 0.0 6372 4568 ? S 08:59 0:00 \_ dovecot/imap dovenull 6373 0.0 0.0 8200 6224 ? S 09:43 0:00 \_ dovecot/imap-login USER1 6375 0.0 0.0 7052 5900 ? S 09:43 0:00 \_ dovecot/imap
The config is the same as last time except for this:
auth_worker_max_count = 100 default_process_limit = 80
Which should be more than enough.
Any ideas? Wolfgang
On 2/3/21 8:19 PM, Wolfgang wrote:
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
Thx!
It seems these processes are in state "dovecot/imap-login [1 pre-login]".
Concerning logs, the only thing that seems suspicious to me is:
Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 5 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: Connection closed, session=<QD/tiia6aKlb6BxS> Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<OCruiia6fstb6BxS> Jan 31 00:33:06 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<SaPviia6HMxb6BxS>
The IPs in question are not our own IPs.
Since restarting (about 45 minutes), I have about a dozen of the "Disconnected (no auth attempts" and exactly 13 of the pre-login processes. In fact, the number of pre-login processes just jumped by 2 and the log just shows 2 new "Disconnected (no auth attempts in 0 secs)"
This might have something to do with it.
Version is 2.3.4.1. It's a production system, I'd like to avoid having to compile my own version of dovecot unless there's no way around it.
Greetings, Wolfgang
On 2/5/21 10:51 AM, Aki Tuomi wrote:
Can you set
verbose_proctitle = yes
this should provide more information what the process is up to.
Can you also check your logs?
Aki
On 05/02/2021 11:46 Wolfgang <adminkram@tripelspark.de> wrote:
Hi,
Sorry, the problem is back! Not solved, again no change except that I lowered the limits again and restarted dovecot. Here is what it looks like:
lsof -a -i4 -i6 -itcp | fgrep imap-logi | wc 9
--> There are 9 TCP connections to imap-login.
ps aux | fgrep imap-login | wc 81 ps aux | fgrep imap | wc 90
--> There are 90-81 = 9 IMAP worker processes (OK) and 81 imap-login processes (not OK). Thunderbird cannot connect again.
ps auxf | fgrep dove root 28118 0.0 0.0 4200 2752 ? Ss Feb03 0:02 /usr/sbin/dovecot -F dovecot 28138 0.0 0.0 4176 2224 ? S Feb03 0:01 \_ dovecot/anvil root 28139 0.0 0.0 4172 2436 ? S Feb03 0:00 \_ dovecot/log root 28140 0.0 0.0 6764 4636 ? S Feb03 0:05 \_ dovecot/config dovecot 28143 0.0 0.0 5360 3584 ? S Feb03 0:01 \_ dovecot/stats dovenull 28206 0.0 0.0 8200 4652 ? S Feb03 0:02 \_ dovecot/imap-login USER2 28207 0.0 0.0 6356 3988 ? S Feb03 0:02 \_ dovecot/imap dovenull 28234 0.0 0.0 8200 4712 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28235 0.0 0.0 6356 2924 ? S Feb03 0:02 \_ dovecot/imap dovenull 28275 0.0 0.0 8200 4716 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28276 0.0 0.0 9416 7308 ? S Feb03 0:03 \_ dovecot/imap dovenull 19673 0.0 0.0 8212 6380 ? S Feb04 0:00 \_ dovecot/imap-login USER3 19674 0.0 0.0 14220 7680 ? S Feb04 0:01 \_ dovecot/imap dovenull 21688 0.0 0.0 8200 6416 ? S Feb04 0:01 \_ dovecot/imap-login USER2 21690 0.0 0.0 9604 8504 ? S Feb04 0:01 \_ dovecot/imap dovenull 22398 0.0 0.0 8200 6440 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22400 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22593 0.0 0.0 8200 6292 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22595 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22814 0.0 0.0 8200 6324 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22816 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23026 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23028 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login .......(skipped some lines of imap-login)........ dovenull 23179 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23181 0.0 0.0 8200 6368 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23421 0.0 0.0 8200 6284 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23423 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23611 0.0 0.0 8200 6380 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23613 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23797 0.0 0.0 8200 6464 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23799 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24029 0.0 0.0 8200 6300 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24031 0.0 0.0 8200 6188 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24205 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24207 0.0 0.0 8200 6320 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 5628 0.0 0.0 8212 6408 ? S 08:59 0:00 \_ dovecot/imap-login USER1 5629 0.0 0.0 7844 6460 ? S 08:59 0:00 \_ dovecot/imap optores 5630 0.0 0.0 6356 4444 ? S 08:59 0:00 \_ dovecot/imap USER1 5631 0.0 0.0 6372 4568 ? S 08:59 0:00 \_ dovecot/imap dovenull 6373 0.0 0.0 8200 6224 ? S 09:43 0:00 \_ dovecot/imap-login USER1 6375 0.0 0.0 7052 5900 ? S 09:43 0:00 \_ dovecot/imap
The config is the same as last time except for this:
auth_worker_max_count = 100 default_process_limit = 80
Which should be more than enough.
Any ideas? Wolfgang
On 2/3/21 8:19 PM, Wolfgang wrote:
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
Can you try using https://repo.dovecot.org and see if it happens with 2.3.13 version?
Aki
On 05/02/2021 13:42 Wolfgang <adminkram@tripelspark.de> wrote:
Thx!
It seems these processes are in state "dovecot/imap-login [1 pre-login]".
Concerning logs, the only thing that seems suspicious to me is:
Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 5 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: Connection closed, session=<QD/tiia6aKlb6BxS> Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<OCruiia6fstb6BxS> Jan 31 00:33:06 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<SaPviia6HMxb6BxS>
The IPs in question are not our own IPs.
Since restarting (about 45 minutes), I have about a dozen of the "Disconnected (no auth attempts" and exactly 13 of the pre-login processes. In fact, the number of pre-login processes just jumped by 2 and the log just shows 2 new "Disconnected (no auth attempts in 0 secs)"
This might have something to do with it.
Version is 2.3.4.1. It's a production system, I'd like to avoid having to compile my own version of dovecot unless there's no way around it.
Greetings, Wolfgang
On 2/5/21 10:51 AM, Aki Tuomi wrote:
Can you set
verbose_proctitle = yes
this should provide more information what the process is up to.
Can you also check your logs?
Aki
On 05/02/2021 11:46 Wolfgang <adminkram@tripelspark.de> wrote:
Hi,
Sorry, the problem is back! Not solved, again no change except that I lowered the limits again and restarted dovecot. Here is what it looks like:
lsof -a -i4 -i6 -itcp | fgrep imap-logi | wc 9
--> There are 9 TCP connections to imap-login.
ps aux | fgrep imap-login | wc 81 ps aux | fgrep imap | wc 90
--> There are 90-81 = 9 IMAP worker processes (OK) and 81 imap-login processes (not OK). Thunderbird cannot connect again.
ps auxf | fgrep dove root 28118 0.0 0.0 4200 2752 ? Ss Feb03 0:02 /usr/sbin/dovecot -F dovecot 28138 0.0 0.0 4176 2224 ? S Feb03 0:01 \_ dovecot/anvil root 28139 0.0 0.0 4172 2436 ? S Feb03 0:00 \_ dovecot/log root 28140 0.0 0.0 6764 4636 ? S Feb03 0:05 \_ dovecot/config dovecot 28143 0.0 0.0 5360 3584 ? S Feb03 0:01 \_ dovecot/stats dovenull 28206 0.0 0.0 8200 4652 ? S Feb03 0:02 \_ dovecot/imap-login USER2 28207 0.0 0.0 6356 3988 ? S Feb03 0:02 \_ dovecot/imap dovenull 28234 0.0 0.0 8200 4712 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28235 0.0 0.0 6356 2924 ? S Feb03 0:02 \_ dovecot/imap dovenull 28275 0.0 0.0 8200 4716 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28276 0.0 0.0 9416 7308 ? S Feb03 0:03 \_ dovecot/imap dovenull 19673 0.0 0.0 8212 6380 ? S Feb04 0:00 \_ dovecot/imap-login USER3 19674 0.0 0.0 14220 7680 ? S Feb04 0:01 \_ dovecot/imap dovenull 21688 0.0 0.0 8200 6416 ? S Feb04 0:01 \_ dovecot/imap-login USER2 21690 0.0 0.0 9604 8504 ? S Feb04 0:01 \_ dovecot/imap dovenull 22398 0.0 0.0 8200 6440 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22400 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22593 0.0 0.0 8200 6292 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22595 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22814 0.0 0.0 8200 6324 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22816 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23026 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23028 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login .......(skipped some lines of imap-login)........ dovenull 23179 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23181 0.0 0.0 8200 6368 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23421 0.0 0.0 8200 6284 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23423 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23611 0.0 0.0 8200 6380 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23613 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23797 0.0 0.0 8200 6464 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23799 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24029 0.0 0.0 8200 6300 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24031 0.0 0.0 8200 6188 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24205 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24207 0.0 0.0 8200 6320 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 5628 0.0 0.0 8212 6408 ? S 08:59 0:00 \_ dovecot/imap-login USER1 5629 0.0 0.0 7844 6460 ? S 08:59 0:00 \_ dovecot/imap optores 5630 0.0 0.0 6356 4444 ? S 08:59 0:00 \_ dovecot/imap USER1 5631 0.0 0.0 6372 4568 ? S 08:59 0:00 \_ dovecot/imap dovenull 6373 0.0 0.0 8200 6224 ? S 09:43 0:00 \_ dovecot/imap-login USER1 6375 0.0 0.0 7052 5900 ? S 09:43 0:00 \_ dovecot/imap
The config is the same as last time except for this:
auth_worker_max_count = 100 default_process_limit = 80
Which should be more than enough.
Any ideas? Wolfgang
On 2/3/21 8:19 PM, Wolfgang wrote:
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
I tried installing the debian packages you mentioned directly after installation, IMAP login fails for all users, and because it's a production system I had to immediately go back.
I may be able to re-try late at night.
Regards, Wolfgang
On 2/5/21 12:58 PM, Aki Tuomi wrote:
Can you try using https://repo.dovecot.org and see if it happens with 2.3.13 version?
Aki
On 05/02/2021 13:42 Wolfgang <adminkram@tripelspark.de> wrote:
Thx!
It seems these processes are in state "dovecot/imap-login [1 pre-login]".
Concerning logs, the only thing that seems suspicious to me is:
Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 5 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: Connection closed, session=<QD/tiia6aKlb6BxS> Jan 31 00:33:05 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<OCruiia6fstb6BxS> Jan 31 00:33:06 static dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=91.232.28.82, lip=78.46.17.21, TLS handshaking: SSL_accept() failed: error:1408F09C:SSL routines:ssl3_get_record:http request, session=<SaPviia6HMxb6BxS>
The IPs in question are not our own IPs.
Since restarting (about 45 minutes), I have about a dozen of the "Disconnected (no auth attempts" and exactly 13 of the pre-login processes. In fact, the number of pre-login processes just jumped by 2 and the log just shows 2 new "Disconnected (no auth attempts in 0 secs)"
This might have something to do with it.
Version is 2.3.4.1. It's a production system, I'd like to avoid having to compile my own version of dovecot unless there's no way around it.
Greetings, Wolfgang
On 2/5/21 10:51 AM, Aki Tuomi wrote:
Can you set
verbose_proctitle = yes
this should provide more information what the process is up to.
Can you also check your logs?
Aki
On 05/02/2021 11:46 Wolfgang <adminkram@tripelspark.de> wrote:
Hi,
Sorry, the problem is back! Not solved, again no change except that I lowered the limits again and restarted dovecot. Here is what it looks like:
lsof -a -i4 -i6 -itcp | fgrep imap-logi | wc 9
--> There are 9 TCP connections to imap-login.
ps aux | fgrep imap-login | wc 81 ps aux | fgrep imap | wc 90
--> There are 90-81 = 9 IMAP worker processes (OK) and 81 imap-login processes (not OK). Thunderbird cannot connect again.
ps auxf | fgrep dove root 28118 0.0 0.0 4200 2752 ? Ss Feb03 0:02 /usr/sbin/dovecot -F dovecot 28138 0.0 0.0 4176 2224 ? S Feb03 0:01 \_ dovecot/anvil root 28139 0.0 0.0 4172 2436 ? S Feb03 0:00 \_ dovecot/log root 28140 0.0 0.0 6764 4636 ? S Feb03 0:05 \_ dovecot/config dovecot 28143 0.0 0.0 5360 3584 ? S Feb03 0:01 \_ dovecot/stats dovenull 28206 0.0 0.0 8200 4652 ? S Feb03 0:02 \_ dovecot/imap-login USER2 28207 0.0 0.0 6356 3988 ? S Feb03 0:02 \_ dovecot/imap dovenull 28234 0.0 0.0 8200 4712 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28235 0.0 0.0 6356 2924 ? S Feb03 0:02 \_ dovecot/imap dovenull 28275 0.0 0.0 8200 4716 ? S Feb03 0:02 \_ dovecot/imap-login USER1 28276 0.0 0.0 9416 7308 ? S Feb03 0:03 \_ dovecot/imap dovenull 19673 0.0 0.0 8212 6380 ? S Feb04 0:00 \_ dovecot/imap-login USER3 19674 0.0 0.0 14220 7680 ? S Feb04 0:01 \_ dovecot/imap dovenull 21688 0.0 0.0 8200 6416 ? S Feb04 0:01 \_ dovecot/imap-login USER2 21690 0.0 0.0 9604 8504 ? S Feb04 0:01 \_ dovecot/imap dovenull 22398 0.0 0.0 8200 6440 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22400 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22593 0.0 0.0 8200 6292 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22595 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22814 0.0 0.0 8200 6324 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 22816 0.0 0.0 8200 6312 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23026 0.0 0.0 8200 6384 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23028 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login .......(skipped some lines of imap-login)........ dovenull 23179 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23181 0.0 0.0 8200 6368 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23421 0.0 0.0 8200 6284 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23423 0.0 0.0 8200 6412 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23611 0.0 0.0 8200 6380 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23613 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23797 0.0 0.0 8200 6464 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 23799 0.0 0.0 8200 6296 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24029 0.0 0.0 8200 6300 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24031 0.0 0.0 8200 6188 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24205 0.0 0.0 8200 6340 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 24207 0.0 0.0 8200 6320 ? S Feb04 0:00 \_ dovecot/imap-login dovenull 5628 0.0 0.0 8212 6408 ? S 08:59 0:00 \_ dovecot/imap-login USER1 5629 0.0 0.0 7844 6460 ? S 08:59 0:00 \_ dovecot/imap optores 5630 0.0 0.0 6356 4444 ? S 08:59 0:00 \_ dovecot/imap USER1 5631 0.0 0.0 6372 4568 ? S 08:59 0:00 \_ dovecot/imap dovenull 6373 0.0 0.0 8200 6224 ? S 09:43 0:00 \_ dovecot/imap-login USER1 6375 0.0 0.0 7052 5900 ? S 09:43 0:00 \_ dovecot/imap
The config is the same as last time except for this:
auth_worker_max_count = 100 default_process_limit = 80
Which should be more than enough.
Any ideas? Wolfgang
On 2/3/21 8:19 PM, Wolfgang wrote:
Hi,
But as Aki said, doveconf -n is crucial, especially since you upgraded from an older version.
Thank you for your response. Unfortunately, I missed the first e-mail a few days ago.
Interestingly it does no longer happen since a few days. We're seeing one IMAP and one IMAP-LOGIN process per connection now which is the expected behavior.
It's completely unclear to me why this does not longer happen now.
Anyway, here's the doveconf output in case you spot something.
Thank you, Wolfgang
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-11-amd64 x86_64 Debian 10.7 # Hostname: static...... auth_mechanisms = scram-sha-1 digest-md5 cram-md5 plain auth_worker_max_count = 300 default_process_limit = 200 first_valid_uid = 1000 hostname = ....... log_timestamp = "%Y-%m-%d %H:%M:%S " mail_location = maildir:~/Maildir mail_plugins = quota acl mail_privileged_group = mail mail_server_admin = postmaster@....... managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } namespace zzzzz { list = children location = maildir:%%h/Maildir-xxx:INDEX=~/index_shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/shadow driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail/shared-%d/shared-mailboxes quota = maildir:User quota quota_rule = *:storage=1G quota_warning = storage=90%% quota-warning 90 %u sieve = file:~/sieve;active=~/dovecot.sieve sieve_extensions = +editheader } postmaster_address = postmaster@xxxxxxx.de protocols = " imap sieve sieve" service auth-worker { chroot = yes user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { vsz_limit = 64 M } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } } ssl_cert = </etc/letsencrypt/live/..../fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/passwd default_fields = quota_rule=*:storage=1G driver = passwd-file } protocol lda { mail_plugins = quota acl sieve } protocol imap { mail_max_userip_connections = 32 mail_plugins = quota acl imap_quota imap_acl }
participants (3)
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＠lbutlr
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Aki Tuomi
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Wolfgang