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<body style="text-align:left; direction:ltr;"><div>Am Dienstag, den 18.12.2018, 14:26 -0500 schrieb Albert E. Whale, CEH CHS CISA CISSP:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<p>I have, but I will be happy to review it once again.<br>
</p>
<div class="moz-cite-prefix">On 12/18/18 2:14 PM, admin wrote:<br>
</div>
<blockquote type="cite" cite="mid:0aff744e0a8d9932603682d9610ea3089c92992a.camel@awib.it" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<div>Am Dienstag, den 18.12.2018, 14:06 -0500 schrieb Albert E.
Whale, CEH CHS CISA CISSP:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<p>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.</p>
<p><br>
</p>
<p>This configuration is currently running at a load average of
17.<br>
</p>
<p>/usr/sbin/dovecot -n<br>
# 2.1.15: /etc/dovecot/dovecot.conf<br>
# OS: Linux 3.10.54-server-2.mga3 i686 Mageia 3<br>
base_dir = /var/run/dovecot/<br>
disable_plaintext_auth = no<br>
lock_method = dotlock<br>
login_greeting = SpamZapper Email ready.<br>
login_log_format_elements = user=<%u> method=%m rip=%r
lip=%l %c<br>
mail_debug = yes<br>
mail_fsync = always<br>
mail_location = maildir:~/Maildir<br>
mail_nfs_index = yes<br>
mail_nfs_storage = yes<br>
mail_privileged_group = mail<br>
mbox_lock_timeout = 15 mins<br>
mmap_disable = yes<br>
passdb {<br>
driver = pam<br>
}<br>
protocols = imap pop3<br>
service anvil {<br>
client_limit = 203<br>
process_limit = 1<br>
}<br>
service auth {<br>
user = root<br>
}<br>
service imap-login {<br>
chroot = login<br>
client_limit = 10<br>
user = dovecot<br>
vsz_limit = 256 M<br>
}<br>
service pop3-login {<br>
chroot = login<br>
client_limit = 20<br>
user = dovecot<br>
}<br>
ssl = no<br>
syslog_facility = local2<br>
userdb {<br>
driver = passwd<br>
}<br>
verbose_proctitle = yes<br>
protocol pop3 {<br>
mail_max_userip_connections = 20<br>
pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m,
size=%s<br>
pop3_uidl_format = %08Xv%08Xu<br>
}<br>
protocol lda {<br>
postmaster_address = <a class="moz-txt-link-abbreviated" href="mailto:postmaster@example.com" moz-do-not-send="true">postmaster@example.com</a><br>
}<br>
protocol imap {<br>
mail_max_userip_connections = 10<br>
}<br>
</p>
<p>And the other server which is currently running with a load
average of 10.</p>
<p>dovecot -n<br>
# 2.2.13: /etc/dovecot/dovecot.conf<br>
doveconf: Warning: service anvil { client_limit=100 } is lower
than required under max. load (303)<br>
# OS: Linux 4.1.15-server-2.mga5 x86_64 Mageia 4<br>
base_dir = /var/run/dovecot/<br>
disable_plaintext_auth = no<br>
listen = *<br>
lock_method = dotlock<br>
login_greeting = SpamZapper Email ready.<br>
login_log_format_elements = user=<%u> method=%m rip=%r
lip=%l %c<br>
mail_fsync = always<br>
mail_location = maildir:~/Maildir<br>
mail_nfs_index = yes<br>
mail_nfs_storage = yes<br>
mail_privileged_group = mail<br>
mmap_disable = yes<br>
passdb {<br>
driver = pam<br>
}<br>
protocols = imap pop3<br>
service anvil {<br>
client_limit = 100<br>
process_limit = 1<br>
}<br>
service auth {<br>
user = root<br>
}<br>
service imap-login {<br>
chroot = login<br>
client_limit = 48<br>
user = dovecot<br>
vsz_limit = 256 M<br>
}<br>
service pop3-login {<br>
chroot = login<br>
client_limit = 50<br>
user = dovecot<br>
}<br>
ssl = no<br>
syslog_facility = local2<br>
userdb {<br>
driver = passwd<br>
}<br>
verbose_proctitle = yes<br>
protocol pop3 {<br>
mail_max_userip_connections = 50<br>
pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m,
size=%s<br>
pop3_uidl_format = %08Xv%08Xu<br>
}<br>
protocol lda {<br>
postmaster_address = <a class="moz-txt-link-abbreviated" href="mailto:postmaster@example.com" moz-do-not-send="true">postmaster@example.com</a><br>
}<br>
protocol imap {<br>
mail_max_userip_connections = 40<br>
}<br>
</p>
<p>Can you please offer a suggestion on what is happening? The
timeouts to the imap server are frequent due to the load
average.</p>
<p>Thank you.<br>
</p>
<div class="moz-signature">-- <br>
-- <br>
--<br>
<br>
Albert E. Whale, CEH CHS CISA CISSP<br>
<b>President - Chief Info Security Officer</b><br>
<a href="http://www.IT-Security-inc.com" moz-do-not-send="true">IT Security, Inc.</a> - A Service
Disabled Veteran Owned Company - (<b>SDVOSB</b>)<br>
<b>HUBZone Certified</b><br>
<a href="https://www.linkedin.com/in/albertwhale" moz-do-not-send="true">LinkedIn</a> Profile<br>
<br>
<br>
Phone: 412-515-3010 | Email: <a class="moz-txt-link-abbreviated" href="mailto:Albert.Whale@IT-Security-inc.com" moz-do-not-send="true">Albert.Whale@IT-Security-inc.com</a><br>
Cell: 412-889-6870<br>
<br>
</div>
</blockquote>
<div><br>
</div>
<div>Did you have a look at <a href="https://wiki2.dovecot.org/NFS" moz-do-not-send="true">https://wiki2.dovecot.org/NFS</a>
?</div>
<div><br>
</div>
<div>-- </div>
<div><span>
<pre>awib IT Solutions</pre>
<pre><a href="mailto:info@awib.it" moz-do-not-send="true">info@awib.it</a></pre><pre><br></pre>
</span></div>
</blockquote>
<div class="moz-signature">-- <br>
-- <br>
--<br>
<br>
Albert E. Whale, CEH CHS CISA CISSP<br>
<b>President - Chief Info Security Officer</b><br>
<a href="http://www.IT-Security-inc.com">IT Security, Inc.</a> - A
Service Disabled Veteran Owned Company - (<b>SDVOSB</b>)<br>
<b>HUBZone Certified</b><br>
<a href="https://www.linkedin.com/in/albertwhale">LinkedIn</a>
Profile<br>
<br>
<br>
Phone: 412-515-3010 | Email: <a class="moz-txt-link-abbreviated" href="mailto:Albert.Whale@IT-Security-inc.com">Albert.Whale@IT-Security-inc.com</a><br>
Cell: 412-889-6870<br>
<br>
</div>
</blockquote><div><span><pre><br></pre><div>Please try to bottom post.</div><div>Would be interesting to know what causes the load (which is not restricted to be caused by CPU only!):</div><div><br></div><div><a href="https://unix.stackexchange.com/a/130970">https://unix.stackexchange.com/a/130970</a></div><div><br></div><div>Might NFS be the culprit?</div><pre><a href="https://serverfault.com/a/120874/229525"><a href="https://serverfault.com/a/120874/229525">https://serverfault.com/a/120874/229525</a></a></pre><pre><br></pre><pre><br></pre><pre>-M</pre><pre>-- <br></pre><pre>awib IT Solutions</pre><pre><a href="mailto:"></a><a href="mailto:info@awib.it">info@awib.it</a><br></pre></span></div></body></html>