Tuesday, April 16, 2013

Fast up Httpd

The Apache’s configuration file is located at “/usr/local/apache/conf/httpd.conf” in a cPanel server

Timeout
This directive “Timeout” is used to define the amount of time Apache will wait for a GET, POST, PUT request and ACKs on transmissions before automatically disconnect when idle time exceeds this value. The ideal value will be 120 in heavily loaded servers. It is recommended to set this value lower if your clients have low latencies. Some time, setting this directive to a low value may pause problem, this highly depend on your network and server setup. The best is to experiment with different values to find the one that fit your need.

KeepAlive
This directive “KeepAlive” if set to “On”, enables persistent connections on the web server. For better performance, it’s recommended to set this option to “On” and allow more than one request per connection.

MaxKeepAliveRequests
This directive is used to define the number of requests allowed per connection when the KeepAlive option above is set to “On”. When the value of this option is set to “0″ then unlimited requests are allowed on the server. For server performance, it’s recommended to allow unlimited requests.

KeepAliveTimeout
This directive is used to define how much time, in seconds, Apache will wait for a subsequent request before closing the connection. Once a request has been received, the timeout value specified by the “Timeout” directive applies. The value of “10″ seconds is a good average for server performance. This value should be kept low as the socket will be idle for extended periods otherwise.

MaxClients
This directive is used to define the limit on the number of child processes that will be created to serve requests. The default means that up to 512 HTTP requests can be handled concurrently. This is an important tuning parameter regarding the performance of the Apache web server. For high load operation, a value of “512″ is recommended. For standard use, you can set the value to “256″.

MinSpareServers
This directive is used to define the minimum number of idle child server processes that should be created. An idle process is one which is not handling a request. If there are fewer than “MinSpareServers” idle, then the parent process creates new children at a maximum rate of 1 per second. The idle value is 10
MaxSpareServer
This directive is used to define the maximum number of idle child server processes that should be created. If there are more than “MaxSpareServers” idle child processes, then the parent process will kill off the excess processes and these extra processes will be terminated.The idle value is 15.

MaxRequestsPerChild
This option “MaxRequestsPerChild” is used to define the number of requests that an individual child server process will handle. Set this directive to “0″ to get the maximum performance and scalability for the server.

HostnameLookups
This directive if set to “Off”, specifies to disable DNS lookups. It’s recommended to set this option to “Off” in order to avoid latency to every request, to save the network traffic time, and to improve the performance of your Apache web server.

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