Apache Optimization

httpd.conf is configuration file of apache server and all important options are stored there. httpd.conf is located at /usr/local/apache/conf/httpd.conf.

vi /usr/local/apache/conf/httpd.conf

MaxClients (Total number of concurrent connections.)

It should be set reasonable value because if set high value then there is chance a complete server hang in case of a DOS attack. It can set value as per hardware configuration . If you have 2 GB or RAM set this value to 300.
This should be set to a reasonable value. I suggest using this formula to determine the right value for your server.
MaxClients = 150 x RAM (GB)
If you set low value then it can create timeout problems for your clients if the limit is reached so better set reasonable value.
This value should be same as MaxClients
ServerLimit = 150 x RAM (GB)
MinSpareServers and MaxSpareServers
MaxSpareServers and MinSpareServers control how many spare (unused) child-processes Apache will keep alive while waiting for more requests to put them to use. Each child-process consumes resources, so having MaxSpareServers set too high can cause resource problems. On the other hand, if the number of unused servers drops below MinSpareServers, Apache will fork (an expensive operation) new child-processes until MinSpareServers is satisfied.
should be set below value
MinSpareServers 5
MaxSpareServers 10
If you have more them 2 GB of RAM and you run a resource intensive website consider increasing MaxSpareServers.
It should not be set lower value because  it will put an unnecessary load on the apache server to recreate the child. It controls the number of request the a child serves before the child is killed
I suggest you set below value .

MaxRequestsPerChild 1000 for 1 GB RAM
10,000 for 2 GB and 0 for more than 2 GB RAM

KeepAlive and MaxKeepAliveRequests

KeepAlive provides long-lived HTTP sessions which allow multiple requests to be sent over the same TCP connection. In some cases this has been shown to result in an almost 50% speedup in latency times for HTML documents with many images, but having keepalive on is also a resource intensive setting.
Here comes the big question: To KeepAlive or not to KeepAlive?
Well the opinions are mixed here, some say to KeepAlive some say not to.

KeepAlive off
If you want to hear my option I would say NOT to KeepAlive if you are running a shared hosting business or if you want to get the most out of your hardware. You should KeepAlive only if the loading time of your pages is the most important factor in your business and you have the money to invest in a more powerful hardware. If you decide to KeepAlive I suggest you set MaxKeepAliveRequest low to something like 2 seconds.

Sets the number of child server processes created on startup. This setting depends greatly on the type of webserver you run. If you run low traffic websites on that server set it low to something like 5. If you have resource intensive websites on that server you should set it close to MaxClients.

StartServers 5
The amount of time Apache will wait for three things: the total amount of time it takes to receive a GET request, The amount of time between receipt of TCP packets on a POST or PUT request, the amount of time between ACKs on transmissions of TCP packets in responses.
The default value is 300. You should set time to something a bit lower. A setting of 150 is probably ok. This will also help in case of small DOS attacks like to ones targeting some phpBB forums. Do NOT set it any lower then 10 as your users will start having timeout problems.
Timeout 150
After you have done all the necessary changes you can go ahead and restart Apache.
There is an extra step that you have to do so that the changes that you done to httpd.conf aren’t lost when a recompile is done.
To also save the changes in the database you will have to run:
/usr/local/cpanel/bin/apache_conf_distiller –update
You can check to see if the changes were accepted and will not be discarded at the next apache recompile by running

Sample values:
MinSpareServers 5
MaxSpareServers 10
ServerLimit 600
MaxClients 600
MaxRequestsPerChild 0
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 3

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