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Apache workers unusual peak

Discussion in 'EasyApache' started by pagchen, Mar 15, 2013.

  1. pagchen

    pagchen Member

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    Hi,
    I got many httpd restart this morning due to connections limit and when checking configserver system info looking for any clue I found the apache worker graph showing intance peaking (see joined screenshot).

    What would cause a worker peak like such ? I see no specific clue in apache's error_log?

    What would you do in my position, just raise my max_client setting (now default to 150)?

    Server is quite beefy with 24Gb ram and 4 duo-core Xeon(R) CPU E5606 @ 2.13GHz processors.

    Many thanks,

    worker-peak.png
     
  2. cPanelJamyn

    cPanelJamyn Social Engineer
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    It's not easy to tell from just the graph. Some potential causes:

    - Hung or slow sub-processes,
    - DDOS attack,
    - poorly optimized site/page,
    - overloaded DB server delaying everything else.

    What was the site traffic like around that time? Did any virtual hosts have a larger than normal amount of activity?
     
  3. pagchen

    pagchen Member

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    Hi Jamyn,
    That is the only sign of abnormal activity I found, Mysql connections/load were fine.
    Which log could tell me the traffic at that time? Do I need to go through all domlogs for each host?
    Is there any guide to help troubleshoot server problems?
    Thanks
     
  4. JamesOakley

    JamesOakley Well-Known Member

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    Are you on 11.36? Did you enable e-mail auto-discovery for Outlook / Thunderbird?
     
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