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- Normally, a minimal initrd is created automatically by the rcutorture
- scripting. But minimal really does mean "minimal", namely just a single
- root directory with a single statically linked executable named "init":
- $ size tools/testing/selftests/rcutorture/initrd/init
- text data bss dec hex filename
- 328 0 8 336 150 tools/testing/selftests/rcutorture/initrd/init
- Suppose you need to run some scripts, perhaps to monitor or control
- some aspect of the rcutorture testing. This will require a more fully
- filled-out userspace, perhaps containing libraries, executables for
- the shell and other utilities, and soforth. In that case, place your
- desired filesystem here:
- tools/testing/selftests/rcutorture/initrd
- For example, your tools/testing/selftests/rcutorture/initrd/init might
- be a script that does any needed mount operations and starts whatever
- scripts need starting to properly monitor or control your testing.
- The next rcutorture build will then incorporate this filesystem into
- the kernel image that is passed to qemu.
- Or maybe you need a real root filesystem for some reason, in which case
- please read on!
- The remainder of 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 http://archive.ubuntu.com/ubuntu
- cat << '___EOF___' | sudo dd of=/mnt/etc/fstab
- # UNCONFIGURED FSTAB FOR BASE SYSTEM
- #
- /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
- ___EOF___
- sudo umount /mnt
- ------------------------------------------------------------------------
- References:
- http://sripathikodi.blogspot.com/2010/02/creating-kvm-bootable-fedora-system.html
- https://help.ubuntu.com/community/KVM/CreateGuests
- https://help.ubuntu.com/community/JeOSVMBuilder
- http://wiki.libvirt.org/page/UbuntuKVMWalkthrough
- http://www.moe.co.uk/2011/01/07/pci_add_option_rom-failed-to-find-romfile-pxe-rtl8139-bin/ -- "apt-get install kvm-pxe"
- https://www.landley.net/writing/rootfs-howto.html
- https://en.wikipedia.org/wiki/Initrd
- https://en.wikipedia.org/wiki/Cpio
- http://wiki.libvirt.org/page/UbuntuKVMWalkthrough
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