Securing Linux 101
The last thing you want to do is run a professional webhosting service
with outdated software that is exploitable.
With Debian you can use apt-get to download the latest packages for everything on your system. With RedHat you can use up2date from the commandline. The bigger distributions make this easy on you. Also, you don't want to run any software that is so new that it hasn't been time-tested and proven to be secure. I usually give packages a couple of months before I'm willing to upgrade unless of course they fix a known vulnerability in what I'm currently using.
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