[Dovecot] Error: file_dotlock_open() failed with file + Too many open files

[Kavish Karkera]

Hi All,

We are getting these below error on our IMAP server. 

is this because of open file limits.??

We have set it to 4096.

[root at vish conf.d]# ulimit -n
4096



Aug 27 16:08:26 imap(kavish.karkera at example.com-24685): Error: file_dotlock_open() failed with file /data/quarantine/index//data/quarantine/mailstore/24685/.INBOX.kavish.karkera/dovecot.index.cache: Too many open files

Aug 27 16:08:26 imap(kavish.karkera at example.com-24685): Error: open(/data/quarantine/index//data/quarantine/mailstore/24685/.INBOX.kavish.karkera/dovecot.index.cache.lock) failed: Too many open files

Below is our dovecot conf file.

======================================================================
# 2.2.5: /usr/local/dovecot-2.2.5/etc/dovecot-imap/dovecot.conf
# OS: Linux 2.6.18-194.26.1.el5 x86_64 CentOS release 5.5 (Final) 
auth_socket_path = /usr/local/var/run/dovecot2.2-imap/auth-userdb
base_dir = /usr/local/var/run/dovecot2.2-imap/
default_vsz_limit = 1 G
first_valid_gid = 99
first_valid_uid = 99
hostname = 
log_path = /var/log/dovecot2.2-imap.log
mail_location = maildir:~:INDEX=/data/quarantine/index/%h:CONTROL=/data/quarantine/index/%h
mail_plugins = " virtual notify"
namespace {
  inbox = no
  location = 
  prefix = 
  separator = .
  type = private
}
namespace {
  hidden = yes
  inbox = yes
  list = yes
  location = virtual:~/virtual:LAYOUT=maildir++:INDEX=~/virtual:CONTROL=~/virtual
  prefix = virtual.
  separator = .
  subscriptions = no
  type = private
}
namespace {
  hidden = yes
  inbox = no
  list = no
  location = maildir:~:INDEX=/data/quarantine/index/%h:CONTROL=/data/quarantine/index/%h:LAYOUT=maildir++
  prefix = boxvirtual.
  separator = .
  subscriptions = no
  type = private
}
passdb {
  args = /usr/local/dovecot-2.2.5/etc/dovecot-imap/dovecot-sql.conf.ext
  driver = sql
}
protocols = imap
service auth {
  unix_listener auth-userdb {
    group = nobody
    mode = 0666
    user = nobody
  }
}
service imap-login {
  inet_listener imap {
    port = 20143
  }
  vsz_limit = 1 G
}
service imap-postlogin {
  executable = script-login -d /usr/local/bin/dovecot.virtual.sh
  unix_listener imap-postlogin {
    mode = 0666
  }
}
service imap {
  executable = /usr/local/dovecot-2.2.5/libexec/dovecot/imap imap-postlogin
  vsz_limit = 1 G
}
ssl = no
userdb {
  args = /usr/local/dovecot-2.2.5/etc/dovecot-imap/dovecot-sql.conf.ext
  driver = sql
}
protocol imap {
  mail_max_userip_connections = 1000
  mail_plugins = " virtual notify"
}



Regards,
Kavish Karkera