Dovecot version 2.3.17 - mail replication stopped working

Daniel Botting
Thu, 28 Oct 2021 14:33:24 -0000

Hi,

We upgraded to Dovecot 2.3.17 today and mail replication has stopped
working as expected, the error in mail.err is:

Oct 28 10:27:44 hostname dovecot: imap-login: Error:
net_connect_unix(/var/run/dovecot/stats-writer) failed: No such file or
directory

Oct 28 10:28:47 hostname dovecot: doveadm: Error: sync: invalid option
-- 'T'

This is constantly repeated afterwards

All the files in /var/run/dovecot have last modified time of 10:27

The permissions on both hosts for this file are:

srw-rw----? 1 root??? dovecot??? 0 Oct 28 10:27 stats-writer
OS: Debian 10.11

Doveconf -n output below:

# 2.3.17 (e2aa53df5b): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.17 (054dddfa)
# OS: Linux 4.19.0-18-amd64 x86_64 Debian 10.11
# Hostname: mailserver fqdn
auth_verbose = yes
default_vsz_limit = 0
doveadm_password = # hidden, use -P to show it
first_valid_gid = 8
first_valid_uid = 8
last_valid_gid = 8
last_valid_uid = 8
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
mail_gid = 8
mail_location = maildir:~/Maildir
mail_plugins = " notify replication"
mail_uid = 8
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 imapflags
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 }
passdb {
 ? args = /etc/dovecot/dovecot-ldap.conf.ext
 ? driver = ldap
}
plugin {
 ? mail_replica = tcps:fqdn:port number
 ? sieve = ~/.dovecot.sieve
 ? sieve_dir = ~/sieve
 ? sieve_extensions = +editheader +imapflags
}
postmaster_address = postmaster at ourdomain
protocols = " imap sieve pop3"
replication_dsync_parameters = -d -N -l 15 -U -T 10
replication_max_conns = 24
service aggregator {
 ? fifo_listener replication-notify-fifo {
 ??? user = mail
 ? }
 ? unix_listener replication-notify {
 ??? user = mail
 ? }
}
service auth {
 ? unix_listener /var/run/dovecot-exim-bridge {
 ??? mode = 0660
 ??? user = Debian-exim
 ? }
}
service doveadm {
 ? inet_listener {
 ??? port = 12345
 ??? ssl = yes
 ? }
}
service imap-login {
 ? inet_listener imap {
 ??? port = 143
 ? }
 ? inet_listener imaps {
 ??? port = 993
 ??? ssl = yes
 ? }
 ? process_limit = 512
 ? process_min_avail = 4
 ? service_count = 1
}
service imap {
 ? process_limit = 1024
}
service managesieve-login {
 ? inet_listener sieve {
 ??? port = 4190
 ? }
 ? process_min_avail = 1
 ? service_count = 8
 ? vsz_limit = 256 M
}
service managesieve {
 ? process_limit = 1024
}
service replicator {
 ? process_min_avail = 1
 ? unix_listener replicator-doveadm {
 ??? mode = 0666
 ? }
}
ssl = required
ssl_cert = </ssl cert path
ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL
ssl_client_ca_dir = /etc/ssl/certs
ssl_key = # hidden, use -P to show it
userdb {
 ? args = /etc/dovecot/dovecot-ldap.conf.ext
 ? driver = ldap
 ? override_fields = home=/var/mail/%u uid=mail gid=mail
}
protocol lda {
 ? mail_plugins = " notify replication sieve"
}
protocol imap {
 ? mail_max_userip_connections = 32
 ? mail_plugins = " notify replication"
}
protocol sieve {
 ? mail_max_userip_connections = 10
 ? managesieve_logout_format = bytes=%i/%o
 ? managesieve_max_line_length = 64 k
}

Best regards

Daniel