Re: [loganalysis] Re: Central syslog server best practices?

From: arkat_private
Date: Tue Aug 14 2001 - 06:59:00 PDT

  • Next message: jamie rishaw: "Re: [loganalysis] Re: Central syslog server best practices?"

    nuqneH,
    
    Even _much_ worse, BSD derived kernels drop messages on /dev/log and
    /dev/klog on really heavy load :( This obviously needs to be fixed.
    Increasing box performance is not a proper solution.
    
    We ran into that when i tried to help Darren Reed to fix messages drop
    in nsyslogd.
    
    YOU (Marcus J. Ranum) WROTE:
    >  
    >  Brian Hatch wrote:
    >  >Since syslog uses UDP, and there's no method to enforce
    >  >retransmits of lost UDP datagrams built into the protocol
    >  >itself, it's quite possible for a busy network to cause
    >  >UDP packet loss
    >  
    >  It's worse than that; many kernels will drop packets internally
    >  when interface output queues overrun. So your syslog client is
    >  probably dropping the log messages before they even get off
    >  the box.
    
    -- 
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