How to update Kernel Centos

Hi guy's, hopefully some of u linux guy's can give me some help on this..

Basically yesterday I tried logging into my server and couldn't, I knew right away it had be hacked...

I then got a mail from my provider and they told me my server had been "rooted" with root kit.

I got them to do re-install but they told me to update the kernel right away...

Thing is how do I update the kernel ? Will yum do it for me ?

Could one of u guy's post the command to update the kernel in Centos 4.

Thanks alot :)

I seem to have got it sorted by just typing yum update kernel so I'm sorted on this, thanks.

Try this:
http://www.brandonhutchinson.com/Upg..._with_yum.html
I haven't used an RPM based distro in a while so I'm more familiar with apt-get update :P but CentOS is very similar to RedHat Linux so give it a try and tell us what happened.

wont

Code:

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sudo yum update

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do the trick.

If the box is rooted then reformat is the only way to go. You will never know where the hacker lay his malicous scripts.

Yes I re-installed, updated the kernel by typing yum update kernel and it updated..but still after that my server was hacked twice more.

I'm no linux guru so i paid to get it secured with firewall and a custom build kernel from admingeekz.

I've had no problems so far, but I believe that what I paid admingeekz to do, I could have done it myself if I knew a bit about linux.

Ah well tocuh wood it's sorted now.

Thanks for the info guys :)