Security Guide for cPanel servers

You must keep your box secure at all times, getting compromized could lead to dataloss, which means you loose clients which isnt a very good way to run your buisness. You dont have to be an expert, there are just simple instructions you have to follow, check your box daily for any unknown proccesses, cheak on your clients regularly to make sure they are not up to no good. The easiest of steps can make you that one bit more secure which helps.
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Dealing With Distributed Denial of Service Attacks

Distributed denial of service attacks are frustrating — they’re frustrating for the company under attack, and frustrating for the web host. They can also be costly in terms of business and goodwill lost. Fortunately, there are ways to deal with them, if you are willing to prepare for the possibility of a DDoS before it happens.

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HELP! My server is under a DDOS attack!

Ok first just take a breath, you are getting nothing done by worrying. This guide is meant to try and help mitigate the effects of an attack that is in progresss. I have compiled a lot of the things that I do but it is very possible I have forgotten something. Please feel free to add suggestions at the bottom if you would do it a different way or if this works good for you.
This guide is not meant to take the place of a professional looking at your server but it should give you a very good idea of what is going wrong and point you in the right direction to solving the problem. A lot of this requires you to have an idea of what is happening with your server on a normal basis so you can see what is abnormal with it. It would not be a bad idea to run a few of these tests to see what is normal under your normal busy periods.
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PHP optimization How-To: Installing Eaccelerator

Eaccelerator is a PHP accelerator/encoder/caching utility that is based off of the old mmcache (which is no longer being maintained).

What Eaccelerator does is: it caches your PHP scripts so that the database is no longer being queried everytime someone needs a script. This is particularly useful for large forums, but pretty much anyone can benefit from it. Since these scripts are cached, you’ll notice a decrease in memory use and server load.
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Server Security Considerations

>Server security is as important as network security because servers
often hold a great deal of an organization’s vital information. If a
server is compromised, all of its contents may become available for the
cracker to steal or manipulate at will. The following sections detail
some of the main issues.
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