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182 Chapter 15. Apache

15.3.14. MaxClients

MaxClients sets a limit on the total number of server processes, or simultaneously connected clients,

that can run at one time. You should keep MaxClients at a high number (your server’s default is set

to 150), because no one else will be allowed to connect once that number of simultaneously connected

clients is reached. You can not set MaxClients to higher than 256 without recompiling Apache. The

main reason for having MaxClients is to keep a runaway Web server from crashing your operating

system.

15.3.15. MaxRequestsPerChild

MaxRequestsPerChild sets the total number of requests each child server process serves before

the child dies. The main reason for setting MaxRequestsPerChild is to avoid long-lived process

induced memory leaks. The default MaxRequestsPerChild for your server is 1000.

15.3.16. Listen

The Listen command identiﬁes the ports on which your Web server will accept incoming requests.

Your Web server is set to listen to port 80 for non-secure Web communications and (in the virtual host

tags that deﬁne the secure server) to port 443 for secure Web communications.

If you set Apache to listen to a port under 1024, you must be root to start it. For port 1024 and above,

httpd can be started as a regular user.

Listen can also be used to specify particular IP addresses over which the server will accept connec-

tions.

15.3.17. BindAddress

BindAddress is a way of specifying which IP addresses your server will listen to. You should use

the Listen directive instead if you need this functionality. BindAddress is not used by your Web

server; by default it is commented out in httpd.conf.

15.3.18. LoadModule

LoadModule is used to load in Dynamic Shared Object (DSO) modules. More information on the

Apache’s DSO support, including exactly how to use the LoadModule directive, can be found in

Section 15.4. Note, the load order of the modules is important, so do not move them around.

15.3.19. IfDefine

The

IfDefine and /IfDefine tags surround conﬁguration directives that are applied if the

"test" stated in the

IfDefine tag is true. The directives are ignored if the test is false.

The test in the IfDefine tags is a parameter name (for example, HAVE_PERL). If the parameter

is deﬁned, meaning that it is provided as an argument to the server’s start-up command, then the test

is true. In this case, when your Web server is started, the test is true and the directives contained in the

IfDefine tags are applied.

By default, IfDefine HAVE_SSL tags surround the virtual host tags for your secure server.

IfDefine HAVE_SSL tags also surround the LoadModule and AddModule directives for the

ssl_module.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 182