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Chapter 15. Apache 181

15.3.8. Timeout

Timeout deﬁnes, in seconds, the amount of time that your server will wait for receipts and trans-

missions during communications. Speciﬁcally, Timeout deﬁnes how long your server will wait to

receive a GET request, how long it will wait to receive TCP packets on a POST or PUT request and

how long it will wait between ACKs responding to TCP packets. Timeout is set to 300 seconds,

which is appropriate for most situations.

15.3.9. KeepAlive

KeepAlive sets whether your server will allow more than one request per connection (in other words,

it will allow persistent connections). KeepAlive can be used to prevent any one client from consum-

ing too much of the server’s resources.

By default Keepalive is set to off. If Keepalive is set to on and the server becomes very busy, the

server can quickly spawn the maximum number of child processes. In this situation, the server will

slow down signiﬁcantly. If Keepalive is enabled, it is a good idea to set the the KeepAliveTimeout low

(see Section 15.3.11) and monitor the servers /var/log/httpd/error_log. This log will report

when the server is running out of child processes.

15.3.10. MaxKeepAliveRequests

This directive sets the maximum number of requests allowed per persistent connection. The Apache

Group recommends a high setting, which will improve your server’s performance. MaxKeepAliv-

eRequests is set to 100 by default, which should be appropriate for most situations.

15.3.11. KeepAliveTimeout

KeepAliveTimeout sets the number of seconds your server will wait after a request has been served

before it closes the connection. Once the server receives a request, the Timeout directive applies

instead.

15.3.12. MinSpareServers and MaxSpareServers

The Apache Web server dynamically adapts to the perceived load by maintaining an appropriate num-

ber of spare server processes based on the trafﬁc. The server checks the number of servers waiting for

a request and kills some if there are more than MaxSpareServers or creates some if the number of

servers is less than MinSpareServers.

Your server’s default MinSpareServers is 5; your server’s default MaxSpareServers is 20. These

default settings should be appropriate in most situations. You should not increase the MinSpare-

Servers to a large number. Doing so will create a heavy processing load on your server even when

trafﬁc is light.

15.3.13. StartServers

StartServers sets how many server processes are created upon startup. Since your Web server

dynamically kills and creates server processes based on trafﬁc load, you will not need to change this

parameter. Your Web server is set to start eight server processes at startup.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 181