SOLVED sDovecot LMTP high CPU after migration from Dedicated Server to Virtual machine

[imrans]

Dear all,

I have just migrated few account from old centos 6 dedicated Server to Centos 7 Virtual machine . I am facing issue with high cpu usage due to Dovecot/lmtp multiple processes using 100% cpu .

I have cheched the logs and queue and found below: -

[[email protected] ~]# ps ax | grep dovecot
4820 ? Ss 0:00 /usr/sbin/dovecot -F -c /etc/dovecot/dovecot.conf
4822 ? S 0:00 dovecot/pop3-login
4823 ? S 0:00 dovecot/imap-login
4824 ? S 0:00 dovecot/anvil
4825 ? S 0:00 dovecot/log
4826 ? S 0:00 dovecot/config
4827 ? S 0:00 dovecot/stats
4828 ? S 0:00 dovecot/pop3-login
4829 ? S 0:00 dovecot/imap-login
4830 ? S 0:00 dovecot/auth
8969 ? R 7:50 dovecot/lmtp
9477 ? R 6:55 dovecot/lmtp
9647 ? R 4:55 dovecot/lmtp
9778 ? R 2:55 dovecot/lmtp
9896 ? S 0:00 dovecot/lmtp

Top command shows this:-

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9477 apytpcom 20 0 119292 55792 7332 R 100.0 0.6 7:32.65 lmtp
9647 apytcom 20 0 94140 35568 7344 R 100.0 0.4 5:33.30 lmtp
9778 apytcom 20 0 94140 30412 7204 R 100.0 0.3 3:32.75 lmtp
8969 apytcom 20 0 119292 60836 7356 R 97.3 0.7 8:25.64 lmtp


dovecot services status shows this :-

Jun 09 13:24:02 srv1.vde3tel.com dovecot[4825]: lmtp(9896): Disconnect from local: Client has quit the connection (state=READY)
Jun 09 13:25:01 srv1.vde3tel.com dovecot[4825]: lmtp(9896): Connect from local
Jun 09 13:25:01 srv1.vde3tel.com dovecot[4825]: lmtp(9896): Disconnect from local: Client has quit the connection (state=READY)
Jun 09 13:26:01 srv1.vde3tel.com dovecot[4825]: lmtp(9896): Connect from local
Jun 09 13:26:01 srv1.vde3tel.com dovecot[4825]: lmtp(9896): Disconnect from local: Client has quit the connection (state=READY)
Hint: Some lines were ellipsized, use -l to show in full.
the above is current time .

in Cpanel queue manager shows lots of messages like this

Time Received	Sender	Message ID	Recipient(s)	Size	Status

Jun 9, 2020, 6:17 PM

[email protected]

1jie7h-0002Ri-KR

[email protected]

850 bytes

Queued

can somebody help me in this to fix this Dovecot/LMTP high CPU usage .

Just to give some more information that "apytcom" is one domain hosted on this server and srv1.domain.com is the hostname of the virutal machine where cpanel is installed.

Thank you in advance
Imran


about 500 messages

 

[imrans]

Some more infomration for same issue , I have checked the dovecot log and found this very often

Error: Mailbox list index was marked as fsck'd

also found below error in log :-

: Error: lmtp-server: conn unix:pid=1951,uid=47 [5]: rcpt [email protected]: Corrupted transaction log file /home/apytcom/mail/dovecot.list.index.log seq 3:: Error: lmtp-server: conn unix:pid=1951,uid=47 [5]: rcpt [email protected]: Corrupted transaction log file /home/apytcom/mail/dovecot.list.index.log seq 3:


I have deleted the full queue and still these emails are being coming into queue .

Please advise
Thank you

 

[imrans]

Now I found one more error from log as below:-

Jun 09 18:58:02 lmtp([email protected])<3293><yBwzBrrb317dDAAALvZA5Q>: Debug: lmtp-server: conn unix:pid=3313,uid=47 [2]: rcpt [email protected]: Added userdb setting: plugin/userdb_quota_status_overquota=552 5.2.2 Mailbox is full / Blocks limit exceeded / Inode limit exceeded

so all these issue and the major issue is LMTP high CPU all the time.

Sorry for adding up all the information just to get to some solution from anyone in the community.
Thank you

 

[cPanelLauren]

Deleting the mail queue won't resolve an issue where new mails are inbound into the queue. To clarify all of these emails inbound are indicating that the user's mailbox is full? Is the user sending mail out either legitimately or not? Resolving the actual problem here would be the key not the notification messages since they're automatically created.

 

[imrans]

Hi Lauren,

Thank you for your Response. after reading your suggestion I moved forward and tried to find the main issue, and found our that there was a cron job which was running and all notification was being generated out of it.
I have deleted that cron job and restarted the server. Now all is ok and no load nothing.

Thank you for the help . you can resolve this thread .