Re: Load Increases due to Apache

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Gaurav Pruthi wrote:
I have also noticed kswapd daemon causing the load on server. What i believe is that there is some website whose pages uses lot of memory. Linux uses kswapd for virtual memory management such that pages that have been recently accessed are kept in memory and less active pages are paged out to disk. So,the kswapd process regularly decreases the ages of unreferenced pages...and at the end they are paged out(moved out) to disk.

I am using Apache 2.6. My question is that is it possible to find out which website or script causing this? I used apachetop and find a website having lot of hits & consuming lot of bandwidth. After suspending it, still the issue is there. Top command is showing only httpd processes.

I have tried everything mentioned (mod_evasive,mod_cband,etc) but still clueless. Is it possible in apache2 to run each website under different userid? If yes then how it can be achieved? This will probably ease out to find the culprit.


Thanks,
Gaurav Pruthi

On Fri, Aug 29, 2008 at 2:53 PM, Alexandru David Constantinescu <aldavx@xxxxxxxxx <mailto:aldavx@xxxxxxxxx>> wrote:

    Gaurav Pruthi wrote:

        Hi Agnello,

        I am using prefork MPM

        <IfModule mpm_prefork_module>
           StartServers         20
           MinSpareServers      25
           MaxSpareServers      50
           MaxClients          500
           MaxRequestsPerChild   0
        </IfModule>


        Thanks,
        Gaurav


        On Fri, Aug 29, 2008 at 1:30 PM, Agnello George
        <agnello.dsouza@xxxxxxxxx <mailto:agnello.dsouza@xxxxxxxxx>
        <mailto:agnello.dsouza@xxxxxxxxx
        <mailto:agnello.dsouza@xxxxxxxxx>>> wrote:



           On 8/29/08, *Gaurav Pruthi* <gkpruthi@xxxxxxxxx
        <mailto:gkpruthi@xxxxxxxxx>
           <mailto:gkpruthi@xxxxxxxxx <mailto:gkpruthi@xxxxxxxxx>>> wrote:

               Dear Friends,

               I am facing very strange problem. I have a LAMP server.
        It has
               around 400 of websites hosted on it. Since last one month the
               server load increases suddenly. When checked using top
        command,
               i saw apache process consuming 99% of CPU. After i kill httpd
               and starts it again (or using HUP), load comes down to the
               normal. It happens 8-10 times each day. I am unable to
        find what
               could cause the apache to consume all the resources of server
               and causing server to hang.

               Kindly help me to resolve this issue.

                   Could you tell us the  Server-Pool Size Regulation
         mentioned in the
           httpd.conf          --    Regards
           Agnello D'souza
           www.linux-vashi.blogspot.com
        <http://www.linux-vashi.blogspot.com>
        <http://www.linux-vashi.blogspot.com>

           www.bible-study-india.blogspot.com
        <http://www.bible-study-india.blogspot.com>
           <http://www.bible-study-india.blogspot.com>




-- Gaurav Pruthi


    MaxClients          500 could be useless (I may be wrong but from
    what I know is a hard coded limit in apache source code
    HARD_SERVER_LIMIT who is set to 250 so if you want to raise that
    limit you must recompile your apache)

    MaxRequestsPerChild   0 it say that once a child is created he can
    stay up and running for infinite time. It could be better to limit
    this , let say to 10000 in order to force apache to kill a stressed
    child and start a fresh one.

    MinSpareServers      25 in my opinion is a little bit high.
    Practically you force apache to keep free 25 servers any time. Try
    to set this parameter to something like 10 or 15

    Ther is a lot of literature about those parameters and how is the
    best way to set them bun ther is not a clear solutions so the best
    practice is to start playing with them and look for what happen.


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--
Gaurav Pruthi

If you wanna run each site on different uid (php point of view) , I think - suphp - is the best candidate for you. You will need php compiled as CGI.

Alexandru



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