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| CentOS 5.6, mail server worked perfectly for months but ... https://forum.linode.com/viewtopic.php?f=11&t=7052 |
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| Author: | sblantipodi [ Tue May 03, 2011 8:51 am ] |
| Post subject: | CentOS 5.6, mail server worked perfectly for months but ... |
As title, I'm using centos since CentOS 5.2, always upgraded it with yum update without any problem but leaving the same 2.6.18 kernel from linode. Yesterday I decided to switch to the new 2.6.38 paravirt and rebooted my server. It seems that all worked out fine until night when my server started loosing emails, I lost all the email that they sent me in the night. What is the possible reason of this problem? Thanks. |
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| Author: | sblantipodi [ Tue May 03, 2011 1:57 pm ] |
| Post subject: | Re: CentOS 5.6, mail server worked perfectly for months but |
It seems that our server stopped forwarding email on our email inbox folder in the night, immediately after the cron.daily was executed. The cron daily performs very few action like a dump of the database, sent the admin an email saying him the size of a file (important for us), and sync the time with ntp. What do you think that have created this problem on the latest paravirt kernel? As I saied with the latest legacy 2.6.18 we haven't got any problem for months, with the latest paravirt this problem happened as soon as cron.daily has been executed. |
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| Author: | hoopycat [ Tue May 03, 2011 2:26 pm ] |
| Post subject: | |
Which mail server software are you using? Is there anything interesting in the logs? What have you tried to do to fix it? |
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| Author: | sblantipodi [ Tue May 03, 2011 2:33 pm ] |
| Post subject: | |
hoopycat wrote: Which mail server software are you using?
Is there anything interesting in the logs? What have you tried to do to fix it? I have re-executed the cron.daily to see if this was the cause since the problem started at the same hour that I execute the daily cron, now it seems to work. From my dashboards I noticed high CPU usage from the 4AM to 6AM, I stopped receiving emails at 4AM. In the logs I cannot see any interesting and I don't know how to solve it. What do you think? |
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| Author: | sblantipodi [ Tue May 03, 2011 3:13 pm ] |
| Post subject: | |
I founded this in the logwatch: --------------------- Kernel Begin ------------------------ WARNING: Kernel Errors Present rtc_cmos: probe of rtc_cmos failed with error -38 ...: 2 Time(s) |
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| Author: | sblantipodi [ Tue May 03, 2011 3:27 pm ] |
| Post subject: | |
the maillog contains this lines when the email wasn't delivered. May 3 11:55:16 li62-51 postfix/qmgr[3686]: 98220104BE: to=<myemail@address.com>, relay=none, delay=1285, delays=1285/0.05/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]: Connec\ tion refused) |
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| Author: | hoopycat [ Wed May 04, 2011 10:49 am ] |
| Post subject: | |
Hmm, what do you get for: netstat -ntlp | grep 25 And: dig address.com mx |
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| Author: | sblantipodi [ Wed May 04, 2011 11:01 am ] |
| Post subject: | |
hoopycat wrote: Hmm, what do you get for:
netstat -ntlp | grep 25 And: dig address.com mx it seems that 2.6.38 paravirt causes kernel panick on CentOS, it is a known problem from the linode's team so I switched on the 2.6.35 that has other known problems like this: viewtopic.php?t=6981 but at least it should not panick. I hope that the known problems will be solved soon, I will update thread from time to time to see if something is moved. |
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