I decided to get a dedicated server for my project and passion of the moment (more on that later, maybe). As a result, I wanted to set up a CentOS installation so that I could work out all the bugs before uploading. Unfortunately, it turns out that getting CentOS working on a USB drive is not as easy as, say, Ubuntu or Slax, and it took some googling before I got it to work.
mkinitrd --with-usb --preload=ehci-hcd --preload=usb-storage --preload=scsi_mod --preload=sd_mod ./usbinitrd-X.X.XX-X.XXXX_LLL X.X.XX-X.XXXX_LLL. The right X.X.XX-X.XXXX_LLL codes can be seen under /lib/modules, just choose the appropriate one.
Voila! CentOS goodness on an external USB drive.
If your drive isn’t automatically mounted (or the wrong one is
mounted), do a
mkdir /mnt/usb; mount /dev/sda1 /mnt/usb, substituting
the appropriate device for /dev/sda1. See this forum thread for more
Simon’s guide to USB booting is the canonical guide for
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