You may be running up against Linux system/user limits. Run
$ cat /proc/sys/kernel/pid_max
and
$ ulimit -a
That should give some insight into your problem.
On 12/09/2015 2:53 PM, Rajesh M wrote:
hi
centos 6 64 bit
hex core processor with hyperthreading ie display shows 12 cores
16 gb ram
600 gb 15000 rpm drive
we are having around 4000 users on a server
i wish to allow 1500 pop3 and 1500 imap connections simultaneously.
need help regarding the settings to handle the above
imap-login, pop3-login
imap pop3 service settings
i recently i got an error
imap-login: Error: read(imap) failed: Remote closed connection (process_limit
reached?)
my current dovecot config file
# 2.2.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-431.23.3.el6.x86_64 x86_64 CentOS release 6.5 (Final)
auth_cache_negative_ttl = 0
auth_cache_ttl = 0
auth_mechanisms = plain login digest-md5 cram-md5
default_login_user = vpopmail
disable_plaintext_auth = no
first_valid_gid = 89
first_valid_uid = 89
log_path = /var/log/dovecot.log
login_greeting = ready.
mail_max_userip_connections = 50
mail_plugins = " quota"
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 ihave
namespace {
inbox = yes
location =
prefix =
separator = .
type = private
}
passdb {
args = cache_key=%u webmail=127.0.0.1
driver = vpopmail
}
plugin {
quota = maildir:ignore=Trash
quota_rule = ?:storage=0
}
protocols = imap pop3
service imap-login {
client_limit = 256
process_limit = 400
process_min_avail = 4
service_count = 0
vsz_limit = 512 M
}
service pop3-login {
client_limit = 1000
process_limit = 400
process_min_avail = 12
service_count = 0
vsz_limit = 512 M
}
ssl_cert = </var/qmail/control/servercert.pem
ssl_dh_parameters_length = 2048
ssl_key = </var/qmail/control/servercert.pem
userdb {
args = cache_key=%u quota_template=quota_rule=*:backend=%q
driver = vpopmail
}
protocol imap {
imap_client_workarounds = delay-newmail
mail_plugins = " quota imap_quota"
}
protocol pop3 {
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_fast_size_lookups = yes
pop3_lock_session = no
pop3_no_flag_updates = yes
}
thanks very much,
rajesh
