Hello,
I would like to ask on suggested vsz_limit values.
Is there any way of calculating such values? How should we determine
them? I don't want to risk wrong values (and possible errors) on a
production system, if I upgrade to 2.0.16 where vsz_limit values are
enforced (I read release notes)!
If there is no standard way of calculation, could someone please check
the following info and suggest some values?
I am running dovecot-2.0.13-1_128.el5 x86_64 RPM on CentOS 5.7 (as a VM
on a KVM Host).
All accounts are virtual, hosted on LDAP Server. We have about 250
mailboxes of 4GB each (in practice, only a couple of mailboxes ever
reach 1GB so we are "over-booking"). It is a relatively low-load server.
Memory status and config follows below.
Thanks,
Nick
The server memory condition is as follows:
# vmstat
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
0 0 92 62400 212324 1299604 0 0 397 235 70 39 4 2
89 4 0
# free -m
total used free shared buffers cached
Mem: 2010 1951 59 0 207 1269
-/+ buffers/cache: 474 1536
Swap: 2015 0 2015
---------- Config Start -------------
# 2.0.13: dovecot.conf
protocols = imap pop3
mail_location = maildir:~/Maildir/
mail_gid = 500
mail_uid = 500
auth_mechanisms = plain login
auth_username_format = %Lu
auth_verbose = yes
disable_plaintext_auth = no
mail_plugins = quota
protocol imap {
imap_client_workarounds = "delay-newmail "
mail_plugins = quota imap_quota
}
protocol pop3 {
mail_max_userip_connections = 3
mail_plugins = quota
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
auth_socket_path = /var/run/dovecot/auth-master
info_log_path =
log_path =
mail_plugins = quota
postmaster_address = sysad...@example.com
sendmail_path = /usr/lib/sendmail
}
userdb {
args = /etc/dovecot/dovecot-usrdb-ldap.conf
driver = ldap
}
passdb {
args = /etc/dovecot/dovecot-passdb-ldap.conf
driver = ldap
}
plugin {
quota = maildir:User quota
quota_rule = *:storage=4G
quota_rule2 = Trash:storage=+3%%
quota_warning = storage=75%% quota-warning 75 %u
quota_warning2 = storage=90%% quota-warning 90 %u
}
service quota-warning {
executable = script /opt/mail1.sh
user = vmail
unix_listener quota-warning {
user = vmail
}
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
unix_listener auth-master {
group = vmail
mode = 0660
user = vmail
}
user = root
}
service imap-login {
service_count = 1
vsz_limit = 64 M
}
service pop3-login {
service_count = 1
vsz_limit = 64 M
}
ssl_ca = </etc/pki/CA/certs/chain.pem
ssl_cert = </etc/pki/CA/certs/cert.pem
ssl_key = </etc/pki/CA/private/key.pem
syslog_facility = local1
---------- Config End -------------
