Debian AMD64 Setup
My Linux distribution of choice is Debian,
although for the desktop I'd recommend
Ubuntu. The server was first setup using the
unofficial debian64 repositories. Since the amd64 architecture is now
officially part of Debian, we moved to using an official repository.
see Google
groups. An unofficial repository contains /debian-amd64/ like
so:
#deb http://mirror.espri.arizona.edu/debian-amd64/debian/ sarge main contrib
#deb-src http://mirror.espri.arizona.edu/debian-amd64/debian/ sarge main contrib
Since packages make it to stable at a fairly slow pace, we also want to
use the testing branch. This is fairly straightforward, first update
your /etc/apt/sources.list to use etch/testing by removing (or
commenting out) other repositories and adding the following lines. If
you are outside the USA, replace the .us. part with your country code.
deb http://ftp.us.debian.org/debian testing main contrib
deb-src http://ftp.us.debian.org/debian testing main contrib
Next, run apt-get to update the system, first clean the system, then
update, and upgrade.
apt-get clean
apt-get update
apt-get dist-upgrade
Follow the onscreen instructions, when in doubt pick the default option
or swithc to google and read up. If apt installs a new kernel, you'll
have to restart your server. Finally, to get up to date LAMP packages,
you can use the dotdeb repositories by adding the following lines to
your sources.list. We will need these later to install Apache2, MySQL,
and PHP5.
deb http://dotdeb.netmirror.org/ stable all
deb-src http://dotdeb.netmirror.org/ stable all
Kernel Parameters
Since our last server crashed because of a very low max open files
limit, its worth checking that this setting is not too low on the new
server.
cat /proc/sys/fs/file-max
Currently this returns 100905, which should be more than enough open
files for our expected traffic. See Debian kernel
tuning for more info.
Enabling Hyperthreading
Finally, because the CPU is an Intel P4 with hyperthreading, you can try
using an SMP kernel to enable the 2 "virtual" processors. While there
seems to be some debate on the benefits of Intel's hyperthreading,
IBM{.urlextern
rel="nofollow"} produced some benchmarks on the 2.6.15 kernel which show
some gains. You can install a new kernel with:
apt-get install linux-image-2.6.16-2-em64t-p4-smp
Make sure you install the correct one for your CPU, since there are a
generic 64-bit kernel, AMD specific kernels, Intel specific kernels, as
well as single and multi-processor versions for each.
That's it for this part, if you restart you should still have a working
server (I do). Still to do: basic system security and setting up a LAMP
environment