Hi all,
I'm sure my issues are a result of misconfiguration, but I'm hoping
someone can point me in the right direction. I'm getting pressure to
move us back to GroupWise, which I desperately want to avoid :-/
We're running dovecot 1.2.9 on Ubuntu 10.4 LTS+postfix. The server is a
VM with 1 vCPU and 4GB of RAM. We serve about 10,000 users with anywhere
from 500-1000 logged in at any one time. Messages are stored in Maildir
format on two NFS servers (one for staff, the other for students).
Today I implemented the "High performance" setup described here:
http://wiki.dovecot.org/NFS (mainly moving indexes off of NFS, since I'm
only using the one server).
I also added imapproxy to our webmail client server (SOGo). The vast
majority of our users come in over the web.
We currently see load averages spiking into the 20-30 range. When this
happens, service crawls to a near standstill, and ultimately the SOGo
client starts crashing out.
I'm wondering if anything jumps out at anybody here - feel free to mock
if/when you find an obvious configuration problem. I just want it to
work :-)
dovecot -n
# 1.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-25-server x86_64 Ubuntu 10.04.1 LTS
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s managesieve
listen(default): *
listen(imap): *
listen(pop3): *
listen(managesieve): *:2000
ssl_cert_file: /etc/dovecot/certs/mail_nhusd_k12_ca_us.crt
ssl_key_file: /etc/dovecot/certs/mail_nhusd_k12_ca_us.key
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
login_process_per_connection: no
login_process_size: 512
login_processes_count: 20
login_max_processes_count: 3000
login_max_connections: 64
max_mail_processes: 2048
mail_max_userip_connections(default): 20
mail_max_userip_connections(imap): 20
mail_max_userip_connections(pop3): 10
mail_max_userip_connections(managesieve): 10
mail_access_groups: staffmailusers
mail_privileged_group: dovecot
mail_uid: mail
mail_gid: 502
mail_location: maildir:~/Maildir:INDEX=/var/indexes/%u
mail_nfs_storage: yes
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_executable(managesieve): /usr/lib/dovecot/managesieve
mail_plugins(default): acl imap_acl quota imap_quota expire
mail_plugins(imap): acl imap_acl quota imap_quota expire
mail_plugins(pop3):
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
mail_plugin_dir(managesieve): /usr/lib/dovecot/modules/managesieve
namespace:
type: private
separator: /
inbox: yes
list: yes
subscriptions: yes
namespace:
type: shared
separator: /
prefix: shared/%%u/
location: maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
list: children
lda:
deliver_log_format: %$ -- FROM=%f SUBJECT=%s
mail_plugins: cmusieve acl expire
log_path:
info_log_path:
syslog_facility: mail
postmaster_address:postmas...@nhusd.k12.ca.us
hostname: mail.nhusd.k12.ca.us
auth_socket_path: /var/run/dovecot/auth-master
auth default:
passdb:
driver: pam
passdb:
driver: ldap
args: /etc/dovecot/dovecot-ldap.conf
userdb:
driver: ldap
args: /etc/dovecot/dovecot-ldap.conf
socket:
type: listen
master:
path: /var/run/dovecot/auth-master
mode: 384
plugin:
quota: maildir:User quota
quota_rule: *:storage=9G
quota_rule2: Trash:storage=200M
acl: vfile
acl_shared_dict:file:/home/staff/dovecot/shared-mailboxes
expire: Trash 7 Trash/* 7 Spam 30
expire_dict: proxy::expire
sieve: ~/.dovecot.sieve
sieve_dir: ~/sieve
sieve_extensions: +imapflags
dict:
expire: mysql:/etc/dovecot/dovecot-dict-expire.conf
--
Chris Hobbs
Director, Technology
New Haven Unified School District
--
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