Apache configuration on Ubuntu
Apache Default Timeout
Timeout: The number of seconds before receives and sends time out.
This sets (in simple terms) the maximum time, in seconds, to wait for a request, action it and the response to the request.
The default is deliberately set high to allow for varied situations. You can reduce this to something more sane, to 30 seconds or even lower. A decrease may also help in reducing the effects of a DOS attack.
KeepAlive: Whether or not to allow persistent connections (more than one request per connection).
You should generally have KeepAlive “On” as it allows for persistent connections to a client so each file, image, etc. that gets requested. Without keepalives, the apache server and web client will need to establish new connections for every element needed to display a web page. Keeping a single connection going that the client can reuse allows your server to manage clients more efficiently.
MaxKeepAliveRequests
MaxKeepAliveRequests: The maximum number of requests to allow during a persistent connection. Set to 0 to allow an unlimited amount. We recommend you leave this number high, for maximum performance.
Since we have our persistent connection, set the maximum number of requests per connection. Keep this high for maximum performance. You might want to experiment with this setting a bit, but if you have a site with lots of images, javascript, etc, try increasing MaxKeepAliveRequests to as much as 500.
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