Tuning / Tweaking MySQL

Posted by: Chris  :  Category: Linux Tips

There are a couple of good scripts out there that will help you to tune your mysql usage for better perfomance.  I’ve used both of these, and they are very intuative.  Personally, I prefer the latter, however, I still use both for tweaking.

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How to install RKHunter

Posted by: Chris  :  Category: Linux Tips

I’ve taken on a couple of new servers, so I figured I would share this little tidbit of information.  RKHunter stands for root kit hunter, which will scan your system for nasty root kits.  A quote from the site:

Rootkit scanner is scanning tool to ensure you for about 99.9%* you’re clean of nasty tools. This tool scans for rootkits, backdoors and local exploits by running tests like:
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How to install ClamAV in cPanel

Posted by: Chris  :  Category: Linux Tips

I was reading through my post on how to virus scan ftp uploads, and I realized, I never mentioned how to setup ClamAV, the antivirus software.  So, here we go: Read more…

How to enable mod_deflate globally in cPanel/WHM

Posted by: Chris  :  Category: Linux Tips

This will be a quick one folks.  The Apache module mod_deflate helps in reducing the size of the information sent to a user, by compressing things prior.  It seems to work very well.  Read more…

Display a message to a user when logging in through SSH

Posted by: Chris  :  Category: Linux Tips

If you have ever wanted to display a message to your users when the log in through ssh, you just need to edit a couple of files.  The first one is:

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How to virus scan FTP uploads

Posted by: Chris  :  Category: Linux Tips

To help protect your server, you may want to scan your users FTP uploads.  Here is a great way of doing this, if you are using Pure-FTP and ClamAV.  Pure-FTP has an option to run a file after an upload, called the pure-uploadscript.  What you do, is tie the virus scanner into this script, so that when a file gets uploaded, it will get scanned.  As long as you have your virus scanner up to date, this will pick up most of the main stream virii, as well as the dreaded php shell scripts.

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Server Admininstration

Posted by: Chris  :  Category: Linux Tips

Just wanted to let everyone know that I am open to doing some small server adminstration jobs if anyone has a need.  Looking for something to pass the time :-)

Most of my work has been on RHEL/Centos, though I have worked with other systems.

If you need a hand setting up your new server, I can help you out, at a very low cost.  If you have any questions, I would be happy to answer them as well.

More SSH security

Posted by: Chris  :  Category: Linux Tips

For added security, I modified the .bashrc profile for any users that may have shell access, and added the following, so that when the user logs in, it sends out an email, letting you know that someone has logged in.

echo ‘ALERT – Root Shell Access (YourserverName) on:’ `date` `who` | mail -s “Alert: Root Access from `who | cut -d”(” -f2 | cut -d”)” -f1`” you@yourdomain.com

Of course, you need to modify  the (Yourservername) and you@yourdomain.com part.

This little code gets added into the .bashrc file for the user you want to report. For example, if the user logging in was named tedsite, you would add this to:


I was getting an error though once I tried it:

-bash: mail: command not found

This was fixed easily on the Centos system, by running the following from the command line:

yum install mailx

If you wanted to apply this to the root account, you would edit this file:


A quick note, its best to use an email address that is not on your current server.

Adding a new user to your system

Posted by: Chris  :  Category: Linux Tips

If you need to add a new user to your systemm just run the following commands:

useradd username

That will create a new user, and a new group, for the ‘username’ that you placed in there.  Now, to change the password for that user, run this:

passwd username

The system will ask you to input the password for the ‘username’ you chose twice.  Thats it, make sure you read the article on ssh security on how to make your enviroment more secure.

SSH Security

Posted by: Chris  :  Category: Linux Tips

There are many things one can do to help keep your ssh access secure on a shared hosting enviroment.  Grab your client (putty links can be found on the software page), log in, and lets go!

  1. The first one, don’t allow it!  Pretty simple huh?  In a shared hosting environment, there are very few reasons why you should allow a user to have ssh.  If you do, make sure you inspect the script(s) they plan on running, and keep an eye on the logs. Read more…