To get recommended settings for your server try apachebuddy which is much like mysqltunner run below commands to configure it

Using ApacheBuddy

You can download the ApacheBuddy script as follows:

Code: 
wget https://raw.github.com/gusmaskowitz/apachebuddy.pl/master/apachebuddy.pl
In order to run it, we must make it executable:

Code: 
chmod +x apachebuddy.pl
Afterwards, we can run it.

Code: 
./apachebuddy.pl
server1:~# ./apachebuddy.pl