VPS Performance tuning and scaling

So you've bought a CentOS VPS from us and you find that sometimes you run out of memory and things go wrong.

We've got a few tips and tricks for you to help keep your VPS ticking over.

Adjusting the number of web based clients your VPS can handle from 1 second to the other.

1. First you should backup the file with the following command

cp /etc/httpd/conf.d/swtune.conf /etc/httpd/conf.d/swtune.backup.`date  +%F-%H-%M`

2. The following command opens swtune.conf 

vi /etc/httpd/conf.d/swtune.conf (this command requires that you have some knowledge of using vi, the command nano may be easier to use)

you should see the following section marked "prefork MPM".

Note: The file on a Debian VPS is located at
/etc/apache2/apache2.conf

3. Edit the section that reads:


StartServers       2
MinSpareServers    1
MaxSpareServers    5
MaxClients         10
MaxRequestsPerChild  1000


to something more like this (changes marked in bold):
* For VPS Stater:


StartServers       1
MinSpareServers    1
MaxSpareServers    3
MaxClients         50
MaxRequestsPerChild  1000


4. Save this file by first hitting the Esc key and then typing :wq [hit enter]

5. Restart apache

/etc/init.d/httpd restart [hit enter]

The timeout settings in Apache can sometimes cause problems and keep your visitors waiting for content.

1. First you should backup the file with the following command

cp /etc/httpd/conf.d/swtune.conf /etc/httpd/conf.d/swtune.backup.`date  +%F-%H-%M` [hit enter]

2. The following command opens swtune.conf 

vi /etc/httpd/conf.d/swtune.conf [hit enter] [this command requires that you have some knowledge of using vi, the command nano may be easier to use)

3. Use the following keystrokes to find "Timeout"

/Timeout [hit enter]

4. Edit the section that reads:

Timeout 120

to a more reasonable value like the following (changes marked in bold):

Timeout 20

5. Save this file

6. Restart Apache to apply the changes:

/etc/init.d/httpd restart [hit enter]

A note from the author:

To find out if the MaxClients setting is causing you grief, it's easiest to login to your VPS and run:

grep -i maxclient /var/log/httpd/error_log

This command should give you some details if this setting has been reached.

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