18 Dec
2018
18 Dec
'18
9:40 p.m.
Am Dienstag, den 18.12.2018, 14:26 -0500 schrieb Albert E. Whale, CEH CHS CISA CISSP:
I have, but I will be happy to review it once again. On 12/18/18 2:14 PM, admin wrote: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 spoolwith 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 averageof 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 = postmaster@example.com } protocol imap { mail_max_userip_connections = 10 } And the other server which is currently running with aload 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 = postmaster@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.Whale@IT-Security-inc.com
Cell: 412-889-6870Did you have a look at https://wiki2.dovecot.org/NFS ? -- awib IT Solutions info@awib.it-- -- -- 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.Whale@IT-Security-inc.com Cell: 412-889-6870
Please try to bottom post. Would be interesting to know what causes the load (which is not restricted to be caused by CPU only!):
https://unix.stackexchange.com/a/130970
Might NFS be the culprit? https://serverfault.com/a/120874/229525
-M-- awib IT Solutionsinfo@awib.it