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  • mpm_common - Apache HTTP Server
    denial of service attack and prevent the server from starting by creating a lockfile with the same name as the one the server will try to create See also AcceptMutex MaxClients Directive Description Maximum number of connections that will be processed simultaneously Syntax MaxClients number Default See usage for details Context server config Status MPM Module beos prefork worker The MaxClients directive sets the limit on the number of simultaneous requests that will be served Any connection attempts over the MaxClients limit will normally be queued up to a number based on the ListenBacklog directive Once a child process is freed at the end of a different request the connection will then be serviced For non threaded servers i e prefork MaxClients translates into the maximum number of child processes that will be launched to serve requests The default value is 256 to increase it you must also raise ServerLimit For threaded and hybrid servers e g beos or worker MaxClients restricts the total number of threads that will be available to serve clients The default value for beos is 50 For hybrid MPMs the default value is 16 ServerLimit multiplied by the value of 25 ThreadsPerChild Therefore to increase MaxClients to a value that requires more than 16 processes you must also raise ServerLimit MaxMemFree Directive Description Maximum amount of memory that the main allocator is allowed to hold without calling free Syntax MaxMemFree KBytes Default MaxMemFree 0 Context server config Status MPM Module beos mpm netware prefork worker mpm winnt The MaxMemFree directive sets the maximum number of free Kbytes that the main allocator is allowed to hold without calling free When not set or when set to zero the threshold will be set to unlimited MaxRequestsPerChild Directive Description Limit on the number of requests that an individual child server will handle during its life Syntax MaxRequestsPerChild number Default MaxRequestsPerChild 10000 Context server config Status MPM Module mpm netware mpm winnt mpmt os2 prefork worker The MaxRequestsPerChild directive sets the limit on the number of requests that an individual child server process will handle After MaxRequestsPerChild requests the child process will die If MaxRequestsPerChild is 0 then the process will never expire Different default values The default value for mpm netware and mpm winnt is 0 Setting MaxRequestsPerChild to a non zero value limits the amount of memory that process can consume by accidental memory leakage Note For KeepAlive requests only the first request is counted towards this limit In effect it changes the behavior to limit the number of connections per child MaxSpareThreads Directive Description Maximum number of idle threads Syntax MaxSpareThreads number Default See usage for details Context server config Status MPM Module beos mpm netware mpmt os2 worker Maximum number of idle threads Different MPMs deal with this directive differently For worker the default is MaxSpareThreads 250 These MPMs deal with idle threads on a server wide basis If there are too many idle threads in the server then child processes are killed until the number of idle threads is less than this number For mpm netware the default is MaxSpareThreads 100 Since this MPM runs a single process the spare thread count is also server wide beos and mpmt os2 work similar to mpm netware The default for beos is MaxSpareThreads 50 For mpmt os2 the default value is 10 Restrictions The range of the MaxSpareThreads value is restricted Apache will correct the given value automatically according to the following rules mpm netware wants the value to be greater than MinSpareThreads For worker the value must be greater or equal than the sum of MinSpareThreads and ThreadsPerChild See also MinSpareThreads StartServers MinSpareThreads Directive Description Minimum number of idle threads available to handle request spikes Syntax MinSpareThreads number Default See usage for details Context server config Status MPM Module beos mpm netware mpmt os2 worker Minimum number of idle threads to handle request spikes Different MPMs deal with this directive differently worker uses a default of MinSpareThreads 75 and deal with idle threads on a server wide basis If there aren t enough idle threads in the server then child processes are created until the number of idle threads is greater than number mpm netware uses a default of MinSpareThreads 10 and since it is a single process MPM tracks this on a server wide bases beos and mpmt os2 work similar to mpm netware The default for beos is MinSpareThreads 1 For mpmt os2 the default value is 5 See also MaxSpareThreads StartServers PidFile Directive Description File where the server records the process ID of the daemon Syntax PidFile filename Default PidFile logs httpd pid Context server config Status MPM Module beos mpm winnt mpmt os2 prefork worker The PidFile directive sets the file to which the server records the process id of the daemon If the filename is not absolute then it is assumed to be relative to the ServerRoot Example PidFile var run apache pid It is often useful to be able to send the server a signal so that it closes and then re opens its ErrorLog and TransferLog and re reads its configuration files This is done by sending a SIGHUP kill 1 signal to the process id listed in the PidFile The PidFile is subject to the same warnings about log file placement and security Note As of Apache 2 it is recommended to use only the apachectl script for re starting or stopping the server ReceiveBufferSize Directive Description TCP receive buffer size Syntax ReceiveBufferSize bytes Default ReceiveBufferSize 0 Context server config Status MPM Module beos mpm netware mpm winnt mpmt os2 prefork worker The server will set the TCP receive buffer size to the number of bytes specified If set to the value of 0 the server will use the OS default ScoreBoardFile Directive Description Location of the file used to store coordination data for the child processes Syntax ScoreBoardFile file path Default ScoreBoardFile logs apache status Context server config Status MPM Module beos mpm winnt prefork worker

    Original URL path: http://xserve.kw-berlin.de/manual/mod/mpm_common.html (2016-02-16)
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  • beos - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/beos.html (2016-02-16)


  • event - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/event.html (2016-02-16)


  • worker - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/worker.html (2016-02-16)


  • mpm_netware - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/mpm_netware.html (2016-02-16)


  • mpmt_os2 - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/mpmt_os2.html (2016-02-16)


  • prefork - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/prefork.html (2016-02-16)


  • mpm_winnt - Apache HTTP Server

    (No additional info available in detailed archive for this subpage)
    Original URL path: /manual/mod/mpm_winnt.html (2016-02-16)




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