Hi All,
I have recently moved by webmail server from a VPS to a hosted dedicated server
running Ubuntu 16.04.
Everything is fine except that login is particularly and consistently long
(around 4-5 seconds).
I have noticed that the process dovecot/auth seems to eat all of the resources
of one of the cores available on the host during login. The authentication
backend is a postgres database which is running absolutely fine.
I have been scavenging on the dovecot mailing list for some time but I have not
been able to find a solution to my problem so decided to send this bottle to
the sea.
Here is my config:
$ sudo dovecot -n
# 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.13 (7b14904)
# OS: Linux 3.14.32-xxxx-grs-ipv6-64 x86_64 Ubuntu 16.04.1 LTS ext4
auth_cache_size = 10 M
auth_mechanisms = plain login
default_internal_user = vmail
first_valid_uid = 0
mail_location = maildir:/home/data/vmail/%d/%n
mail_plugins = " fts fts_solr"
mail_privileged_group = vmail
maildir_stat_dirs = yes
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
namespace inbox {
inbox = yes
location =
mailbox Archive {
auto = subscribe
special_use = Archive
}
mailbox Drafts {
auto = subscribe
special_use = Drafts
}
mailbox Junk {
auto = subscribe
special_use = Junk
}
mailbox Sent {
auto = subscribe
special_use = Sent
}
mailbox "Sent Messages" {
special_use = Sent
}
mailbox Trash {
auto = subscribe
special_use = Trash
}
prefix =
}
passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
plugin {
antispam_backend = pipe
antispam_mail_notspam = learn_ham
antispam_mail_sendmail = /usr/bin/rspamc
antispam_mail_sendmail_args = -h;localhost:11334;-P;q1
antispam_mail_spam = learn_spam
antispam_spam = Junk
antispam_trash = Trash
fts = solr
fts_solr = break-imap-search url=http://localhost:8080/solr/
sieve = file:~/sieve;active=~/.dovecot.sieve
sieve_before = /var/lib/dovecot/sieve.d/
}
postmaster_address = postmas...@domain.net
protocols = imap lmtp sieve pop3
service auth-worker {
unix_listener auth-worker {
user = vmail
}
user = vmail
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
unix_listener auth-userdb {
group = vmail
mode = 0660
user = vmail
}
user = vmail
}
service imap-login {
inet_listener imap {
port = 0
}
service_count = 1
}
service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0666
user = postfix
}
user = vmail
}
service pop3-login {
inet_listener pop3 {
port = 0
}
}
ssl = required
ssl_cert =
