Am Dienstag, den 18.12.2018, 14:06 -0500 schrieb Albert E. Whale, CEH
CHS CISA CISSP:
> I have two servers pointing to an NFS mounted mail spool with
> dovecot. Since I recently switched from using Dovecot v1.X, I
> have been experiencing high CPU use with the two Dovecot
> servers.
> I am not certain why they are not well behaved. Here is the
> configuration information.
>
>
>
> This configuration is currently running at a load average of 17.
>
>
> /usr/sbin/dovecot -n
>
> # 2.1.15: /etc/dovecot/dovecot.conf
>
> # OS: Linux 3.10.54-server-2.mga3 i686 Mageia 3
>
> base_dir = /var/run/dovecot/
>
> disable_plaintext_auth = no
>
> lock_method = dotlock
>
> login_greeting = SpamZapper Email ready.
>
> login_log_format_elements = user=<%u> method=%m rip=%r
> lip=%l %c
>
> mail_debug = yes
>
> mail_fsync = always
>
> mail_location = maildir:~/Maildir
>
> mail_nfs_index = yes
>
> mail_nfs_storage = yes
>
> mail_privileged_group = mail
>
> mbox_lock_timeout = 15 mins
>
> mmap_disable = yes
>
> passdb {
>
> driver = pam
>
> }
>
> protocols = imap pop3
>
> service anvil {
>
> client_limit = 203
>
> process_limit = 1
>
> }
>
> service auth {
>
> user = root
>
> }
>
> service imap-login {
>
> chroot = login
>
> client_limit = 10
>
> user = dovecot
>
> vsz_limit = 256 M
>
> }
>
> service pop3-login {
>
> chroot = login
>
> client_limit = 20
>
> user = dovecot
>
> }
>
> ssl = no
>
> syslog_facility = local2
>
> userdb {
>
> driver = passwd
>
> }
>
> verbose_proctitle = yes
>
> protocol pop3 {
>
> mail_max_userip_connections = 20
>
> pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m,
> size=%s
>
> pop3_uidl_format = %08Xv%08Xu
>
> }
>
> protocol lda {
>
> postmaster_address = postmas...@example.com
>
> }
>
> protocol imap {
>
> mail_max_userip_connections = 10
>
> }
>
>
> And the other server which is currently running with a load
> average of 10.
> dovecot -n
>
> # 2.2.13: /etc/dovecot/dovecot.conf
>
> doveconf: Warning: service anvil { client_limit=100 } is lower
> than required under max. load (303)
>
> # OS: Linux 4.1.15-server-2.mga5 x86_64 Mageia 4
>
> base_dir = /var/run/dovecot/
>
> disable_plaintext_auth = no
>
> listen = *
>
> lock_method = dotlock
>
> login_greeting = SpamZapper Email ready.
>
> login_log_format_elements = user=<%u> method=%m rip=%r
> lip=%l %c
>
> mail_fsync = always
>
> mail_location = maildir:~/Maildir
>
> mail_nfs_index = yes
>
> mail_nfs_storage = yes
>
> mail_privileged_group = mail
>
> mmap_disable = yes
>
> passdb {
>
> driver = pam
>
> }
>
> protocols = imap pop3
>
> service anvil {
>
> client_limit = 100
>
> process_limit = 1
>
> }
>
> service auth {
>
> user = root
>
> }
>
> service imap-login {
>
> chroot = login
>
> client_limit = 48
>
> user = dovecot
>
> vsz_limit = 256 M
>
> }
>
> service pop3-login {
>
> chroot = login
>
> client_limit = 50
>
> user = dovecot
>
> }
>
> ssl = no
>
> syslog_facility = local2
>
> userdb {
>
> driver = passwd
>
> }
>
> verbose_proctitle = yes
>
> protocol pop3 {
>
> mail_max_userip_connections = 50
>
> pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m,
> size=%s
>
> pop3_uidl_format = %08Xv%08Xu
>
> }
>
> protocol lda {
>
> postmaster_address = postmas...@example.com
>
> }
>
> protocol imap {
>
> mail_max_userip_connections = 40
>
> }
>
>
> Can you please offer a suggestion on what is happening? The
> timeouts to the imap server are frequent due to the load
> average.
> Thank you.
>
>
> --
>
> --
>
> --
>
>
>
> Albert E. Whale, CEH CHS CISA CISSP
>
> President - Chief Info Security Officer
>
> IT Security, Inc. - A
> Service Disabled Veteran Owned Company - (SDVOSB)
>
> HUBZone Certified
>
> LinkedIn
> Profile
>
>
>
>
>
> Phone: 412-515-3010 | Email: albert.wh...@it-security-inc.com
>
> Cell: 412-889-6870
>
>
>
>
>
>
Did you have a look at https://wiki2.dovecot.org/NFS ?
--
awib IT solutionsi...@awib.it
