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This document describes one way to create the rcu-test-image file
that contains the filesystem used by the guest-OS kernel. There are
probably much better ways of doing this, and this filesystem could no
doubt be smaller. It is probably also possible to simply download
an appropriate image from any number of places.
That said, here are the commands:
dd if=/dev/zero of=rcu-test-image bs=400M count=1
mkfs.ext3 ./rcu-test-image
sudo mount -o loop ./rcu-test-image /mnt
# Replace "precise" below with your favorite Ubuntu release.
# Empirical evidence says this image will work for 64-bit, but...
# Note that debootstrap does take a few minutes to run. Or longer.
sudo debootstrap --verbose --arch i386 precise /mnt
cat << '___EOF___' | sudo dd of=/mnt/etc/fstab
/dev/vda / ext3 defaults 1 1
dev /dev tmpfs rw 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
sudo umount /mnt
References: -- "apt-get install kvm-pxe"