Zhang,

I looked at the dovecot log and did not see any issues. I wasn't sure if this was an issue during the install or not. Prior to putting this on my production system, I tested it on a VPS using 3 or 4 different operating systems. All others went through flawlessly, RHEL / Centos was the only one that experienced this problem. Just wanted to report it to make sure you were aware.

It doesn't appear to affect functionality except that dovecot doesn't start up after the install.

Last question: Are these services automatically set to start using chkconfig dovecot --level 235 on for example, or do i have to manually set this in order to have the mail server automatically load upon bootup?

Same problem here, im using CentOS 6.0, the error just pops but everything works as it should after manualy starting dovecot.
There are no logs in /var/log/dovecot.log but i found some strange ones in sieve.log.

Apr 27 21:07:59 lda: Error: userdb lookup: connect(/var/run/dovecot/auth-master) failed: No such file or directory
Apr 27 21:07:59 lda: Fatal: Internal error occurred. Refer to server log for more information.
Apr 27 21:07:59 lda: Error: userdb lookup: connect(/var/run/dovecot/auth-master) failed: No such file or directory
Apr 27 21:07:59 lda: Fatal: Internal error occurred. Refer to server log for more information.

Restaring dovecot :
/etc/init.d/dovecot restart
Stopping Dovecot Imap:                                   [  OK  ]
Starting Dovecot Imap:                                    [  OK  ]
[root@core02 postfix]# cat /var/log/dovecot.log
Apr 28 15:49:25 master: Warning: Killed with signal 15 (by pid=7466 uid=0 code=kill)
Apr 28 15:49:27 master: Info: Dovecot v2.0.18 starting up (core dumps disabled)

Also "dovecot -n" gives :
# 2.0.18: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-220.13.1.el6.x86_64 x86_64 CentOS release 6.2 (Final)
auth_mechanisms = PLAIN LOGIN
dict {
  expire = db:/var/lib/dovecot/expire/expire.db
  quotadict = mysql:/etc/dovecot/used-quota.conf
}
disable_plaintext_auth = no
last_valid_uid = 500
listen = *
log_path = /var/log/dovecot.log
mail_gid = 500
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/
mail_uid = 500
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacati                                        on subaddress comparator-i;ascii-numeric relational regex imap4flags copy includ                                        e variables body enotify environment mailbox date ihave
passdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
plugin {
  auth_socket_path = /var/run/dovecot/auth-master
  autocreate = INBOX
  autocreate2 = Sent
  autocreate3 = Trash
  autocreate4 = Drafts
  autocreate5 = Junk
  autosubscribe = INBOX
  autosubscribe2 = Sent
  autosubscribe3 = Trash
  autosubscribe4 = Drafts
  autosubscribe5 = Junk
  expire = Trash 7 Trash/* 7 Junk 30
  expire_dict = proxy::expire
  quota = dict:user::proxy::quotadict
  quota_rule = *:storage=1G
  quota_warning = storage=85%% quota-warning 85 %u
  quota_warning2 = storage=90%% quota-warning 90 %u
  quota_warning3 = storage=95%% quota-warning 95 %u
  sieve = /%Lh/sieve/dovecot.sieve
  sieve_dir = /%Lh/sieve
  sieve_global_dir = /home/vmail/sieve
  sieve_global_path = /home/vmail/sieve/dovecot.sieve
}
protocols = pop3 imap sieve
service auth {
  unix_listener /var/spool/postfix/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl_cert = </etc/pki/tls/certs/iRedMail_CA.pem
ssl_key = </etc/pki/tls/private/iRedMail.key
userdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  log_path = /var/log/sieve.log
  mail_plugins = quota sieve autocreate
  postmaster_address = root
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_plugins = quota imap_quota autocreate
}
protocol pop3 {
  mail_plugins = quota
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}

Seams the error can be ignored, everything seams to work ok.
The only real problem I have is with my ISP which blocked my 25 port for incomming email.

< INFO > Configure Policyd (postfix policy daemon).
ERROR 1064 (42000) at line 4 in file: '/usr/share/doc/policyd-1.82/DATABASE.mysql': You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TYPE=MyISAM' at line 6
< INFO > Configure Dovecot (pop3/imap server).

Different kind of error.  Very annoying.  Looks more like bugs in policyd under this line
'/usr/share/doc/policyd-1.82/DATABASE.mysql'

CREATE TABLE policy (
  _rcpt        char(60) NOT NULL default '',
  _optin       tinyint(1) unsigned NOT NULL default '1',
  _priority    tinyint(1) unsigned NOT NULL default '0',
  UNIQUE KEY _rcpt (_rcpt,_optin)
) TYPE=MyISAM;

I think it should be.

CREATE TABLE policy (
  _rcpt        char(60) NOT NULL default '',
  _optin       tinyint(1) unsigned NOT NULL default '1',
  _priority    tinyint(1) unsigned NOT NULL default '0',
  UNIQUE KEY _rcpt (_rcpt,_optin)
) ENGINE=MyISAM;   <-----  Change Type to Engine

Too more links in message. Allowed 1 links. Reduce number of links and post it again.

I'm not sure which link your BB is referring to.  I don't have http:// in the cut and paste.  Very annoying..  :-(

Thanks for the reply Huangbin.  I'm using the standard CentOS 6.2 64Bit with Epel and Remi repository installed.  For IRedMail, I use the latest stabil version which is this one.

http://iredmail.googlecode.com/files/iR … .4.tar.bz2

And no I haven't tried the beta version.  Should I for the Centos 6.2 64 bit?

Stopping mysqld:                                           [  OK  ]
MySQL Daemon failed to start.
Starting mysqld:                                           [FAILED]
Stopping httpd:                                            [FAILED]
Starting httpd:                                            [  OK  ]

Starting Dovecot Imap: doveconf: Fatal: Error in configuration file /var/softwares/iRedMail-0.8.0-beta4/config line 2: Expecting '='
doveconf: Error: managesieve-login: dump-capability process returned 89
doveconf: Fatal: Error in configuration file /var/softwares/iRedMail-0.8.0-beta4/config line 2: Expecting '='
                                                           [FAILED]
Shutting down amavisd: The amavisd daemon is apparently not running, no PID file /var/run/amavisd/amavisd.pid
                                                           [FAILED]

Starting amavisd:                                          [  OK  ]

Stopping Clam AntiVirus Daemon:                            [FAILED]
Starting Clam AntiVirus Daemon: LibClamAV Warning: **************************************************
LibClamAV Warning: ***  The virus database is older than 7 days!  ***
LibClamAV Warning: ***   Please update it as soon as possible.    ***
LibClamAV Warning: **************************************************
                                                           [  OK  ]
Stopping fail2ban:                                         [FAILED]
Starting fail2ban:                                         [  OK  ]

I just finished installing the Beta4 and the error still the same for CentOS 6.2 64Bit.  I'd suggest for copying my.cnf, you change your my.cnf to fit this setup to make it works.

change my.cnf
skip-locking to skip-external-locking

change From [client]
default-character-set=utf8

To [client]
loose-default-character-set=utf8

Disable set-variable = max_connections=1024
# set-variable = max_connections=1024

All the same issues with the stable release version.  Not sure whether this only pertain to Centos 6.2 64  Bit and if it's perhaps you could add some sort of identifier that will look for which version of linux/os it's trying to install and call the proper config setup.  My 2 cents.

We test only CentOS official repos. Sorry.

First one, Dovecot, is a known issue. It doesn't impact anything, so it's safe to ignore it. Still no idea about why it happened. And it happens on CentOS 6, other distributions don't have this issue.

The second one, we use '/etc/init.d/amavisd restart' to start Amavisd service, it will perform 'stop' first, because it wasn't running, so this is not an issue.