Basic Apache performance

[ASIADATA]

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Apache Timeout setting


The timeout setting is the number of seconds before data "sends" or "receives" (to or from the client) time out. Having this set to a high number forces site visitors to "wait in line" which adds extra load to the server.


First backup the file with the following command:

cp /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.bkup.kb-246.1
The following command opens httpd.conf and searches for the term Timeout:

vi +/Timeout /etc/httpd/conf/httpd.conf You should see the following lines:

# Timeout: The number of seconds before receives and sends time out.
Timeout 120
Edit the section that reads:

Timeout 120 to a more reasonable value like the following:

Timeout 20
Save this file by pressing the escape key followed by :wq! which will save the file and exit vi.
Restart Apache to apply the changes:

/etc/init.d/httpd restart

Max Client Settings

On (dv) Dedicated-Virtual v2.0 Servers:


First backup the file with the following command:

cp /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.bkup.kb-246.2
The following command opens httpd.conf and searches for MaxClients:

vi +/MaxClients /etc/httpd/conf/httpd.conf You should see the following section marked prefork MPM.
Edit the section that reads:

<IfModule prefork.c>
StartServers 2
MinSpareServers 1
MaxSpareServers 5
MaxClients 10
MaxRequestsPerChild 1000
</IfModule>

to something more like this:

For Base servers:

<IfModule prefork.c>
StartServers 1
MinSpareServers 1
MaxSpareServers 3
MaxClients 50
MaxRequestsPerChild 1000
</IfModule>
For Rage servers:

<IfModule prefork.c>
StartServers 2
MinSpareServers 2
MaxSpareServers 5
MaxClients 100
MaxRequestsPerChild 1000
</IfModule>
For Extreme servers:

<IfModule prefork.c>
StartServers 2
MinSpareServers 2
MaxSpareServers 5
MaxClients 200
MaxRequestsPerChild 1000
</IfModule>

Save this file and restart Apache to apply the changes:

/etc/init.d/httpd restart

On (dv) Dedicated-Virtual v3.x Servers:


First backup the file with the following command:


cp /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.bkup.kb-246.2
The following command opens httpd.conf and searches for MaxClients:


vi +/MaxClients /etc/httpd/conf/httpd.conf You should see the following section marked prefork MPM.
Edit the section that reads:

<IfModule prefork.c>
StartServers 1
MinSpareServers 1
MaxSpareServers 20
ServerLimit 20
MaxClients 150
MaxRequestsPerChild 4000
</IfModule>
to something more like this:

For Base servers:

<IfModule prefork.c>
StartServers 1
MinSpareServers 1
MaxSpareServers 3
ServerLimit 50
MaxClients 50
MaxRequestsPerChild 4000
</IfModule>
For Rage servers:

<IfModule prefork.c>
StartServers 2
MinSpareServers 2
MaxSpareServers 5
ServerLimit 100
MaxClients 100
MaxRequestsPerChild 4000
</IfModule>
For Extreme servers:

<IfModule prefork.c>
StartServers 2
MinSpareServers 2
MaxSpareServers 5
ServerLimit 200
MaxClients 200
MaxRequestsPerChild 4000
</IfModule>
For Nitro servers:

<IfModule prefork.c>
StartServers 20
MinSpareServers 20
MaxSpareServers 50
ServerLimit 500
MaxClients 500
MaxRequestsPerChild 4000
</IfModule>

Save this file and restart Apache to apply the changes:

/etc/init.d/httpd restart

NOTE:


If you are running into frequent Apache crashes you can check the error_log for MaxClients-related problems.

To check your error logs to see if you have MaxClient issues you can run the following command as root:

grep -i maxclient /var/log/httpd/error_log* If this command returns any results after making the above changes you may need to fine-tune the MaxClients variables further.