[BlueOnyx:07372] Re: Dovecot shutting down

[Ken - Precision Web Hosting, Inc]

----- Original Message ----- 
From: "Taco Scargo" <taco at blueonyx.it>
To: "BlueOnyx General Mailing List" <blueonyx at mail.blueonyx.it>
Sent: Tuesday, May 24, 2011 4:47 PM
Subject: [BlueOnyx:07371] Re: Dovecot shutting down


> What hypervisor are you using?
> If it is KVM on AMD processors you are out of luck.
>
> With regards,
>
> Taco Scargo
> taco at blueonyx.it
>
>
> On 24 mei 2011, at 23:22, Gregg wrote:
>
>>> On 24 May 2011, at 21:58, Gregg wrote:
>>>> I have been having an issue with dovecot shutting down and not coming
>>> back
>>>> up right away.  I know this is happening because I have the server
>>> checking
>>>> for time and sometimes it moves backwards.
>>>
>>> Use NTP, rather than something that does stepping.
>>>
>>>> The problem is, it takes dovecot a lot longer than 13 seconds to come
>>> back
>>>> on, sometimes more than 30 minutes. Is there a way for me to have the
>>>> dovecot process come back up any sooner?
>>>
>>> Easier to fix the cause than the result.
>>
>> I was having it check the time with one of my own servers, since it is a
>> virtual machine, it loses time a bit, but I was checking it maybe too 
>> often,
>> every 5 minutes, maybe I will try to let ntp handle it directly from the
>> GUI?
>>


You could just check the dovecot and restart it with a cron like:
*/2   * * * * /root/restartdovecot.pl




#!/usr/bin/perl
##################################################################
# checks the dovecot processes and restarts if necessary

$maxprocesses = 50;
$running = "no";
$poprunning = "no";
$thecount = 0;

########################################
@ps =`ps auxwwwww | grep imap-login`;
$aps = "@ps";

foreach $line (@ps){
  if ( ($line !~ /defunct/) and ($line !~ /grep/) ) {
      #print "All is well\n";
      $running = "yes";
   }
}

#######################################
@ps =`ps auxwwwww | grep pop3-login`;
$aps = "@ps";

foreach $line (@ps){
  if ( ($line !~ /defunct/) and ($line !~ /grep/) ) {
      #print "All is well\n";
      $poprunning = "yes";
   }
}



if ( ($running eq "no") or  ($pop3running eq "no") ){
         print "dovecot problem \n";
         system ("/etc/rc.d/init.d/dovecot restart");
}



###########################################################################
# checks the maillog to see if we need to restart dovecot


$count =`tail -100  /var/log/maillog | grep "Memory buffer error" -c`;

if ($count > 0) {
  print "Memory buffer error. Restarting dovecot";
  system ("/etc/rc.d/init.d/dovecot restart");
}

###########################################################################
$processcount =`ps fauxw | grep dovecot -c`;

$toomanyprocesses = "no";

if ( $processcount > $maxprocesses ) {
  print "Too many dovecot processes. Will restart\n";
  $toomanyprocesses = "yes";
 system ("/etc/rc.d/init.d/dovecot restart");
}