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qmail-smtpd using 100% cpu

Discussion in 'Plesk for Linux - 8.x and Older' started by shalako, Apr 27, 2006.

  1. shalako

    shalako Guest

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    qmail-smtpd has been maxing out our server's cpu for hours, either as a single process or split into multiple processes adding up to 100% cpu usage. Other services are becoming non-responsive.

    I've read that qmail-smtpd handles incoming mail. Does this mean we're just being blasted with a lot of mail? I've looked at /var/qmail/queue/local and the dirs aren't very big.

    What can I do?
     
  2. gnosis

    gnosis Guest

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    Hi...I'm having this problem too. I've seen several posts on it, but no solutions. So I'm trying to find out if anyone has found a solution.

    Thanks,
    G
     
  3. shalako

    shalako Guest

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    I believe we were dealing with a denial-of-service attack on our hosting company. We migrated to a co-lo.
     
  4. wagnerch

    wagnerch Guest

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    This isn't very useful information to go on, but it would suggest that either it is a DoS attack or a spammer is using one of your domains to use a "bounce" attack for spamming.

    Steps that you can take are to a) investigate the source IP of the attacks and firewall them, and b) use strace and attach to the qmail-smtpd process to see what is happening <perhaps it is looping>

    Good luck.
     
  5. gnosis

    gnosis Guest

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    Actually, in my case, it turned out not to be a DoS. I never thought it was, actually, because I could see that smtp connections were not coming in at any inflated rate.

    The problem was solved with the help of Mirco - see http://forum.swsoft.com/showthread.php?s=&threadid=40173
     
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