Tag Archives: libguestfs

KVM Forum 2015

Assuming HMG can get my passport back to me in time, I am speaking at the KVM Forum 2015 in Seattle USA (full schedule of talks here).

I’m going to be talking about virt-v2v and new features of qemu/KVM that made it possible for virt-v2v to be faster and more reliable than ever.

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Fedora 22 aarch64 virt-builder image

Fedora 22 was released today for x86, and almost simultaneously for aarch64. I have already built a virt-builder image, so you can install it immediately (either on real hardware or under virtualization on x86):

$ virt-builder --arch aarch64 fedora-22

To boot this on x86, use a slightly modified version of the instructions from here:

$ wget http://libguestfs.org/download/builder/fedora-22-aarch64-nvram.xz
$ unxz fedora-22-aarch64-nvram.xz
$ qemu-system-aarch64 -nodefconfig -nodefaults -display none \
    -M virt -cpu cortex-a57 -machine accel=tcg \
    -m 2048 \
    -drive if=pflash,format=raw,file=/usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw,readonly \
    -drive if=pflash,format=raw,file=fedora-22-aarch64-nvram \
    -device virtio-scsi-device,id=scsi \
    -drive file=fedora-22.img,format=raw,if=none,id=hd0 \
    -device scsi-hd,drive=hd0 \
    -netdev user,id=usernet \
    -device virtio-net-device,netdev=usernet \
    -serial stdio

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Fedora 22 virt-builder image

Fedora 22 has been released. And there is a virt-builder cloud image available:

$ virt-builder fedora-22
$ virt-install --import --name test-f22 \
    --ram 2048 --disk path=fedora-22.img,format=raw \
    --os-variant fedora21

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Fedora 21 chrooted on an aarch64 Nexus 9

fedora

A while back I bought a Nexus 9, mainly because it has a weird processor that emulates a 64 bit ARM (aarch64). Google seem to have abandoned this platform entirely, just 6 months after I got it, so fuck you too Google. Anyway here’s how I installed a Fedora 21 aarch64 chroot on the device, using virt-builder and virt-tar-out and a bunch of unnecessary hassle.

First I ran virt-builder, which takes under a minute to produce a Fedora 21 aarch64 disk image. I then used virt-tar-out to convert all the files in that disk image into a tar file:

$ virt-builder --arch aarch64 fedora-21
$ virt-tar-out -a fedora-21.img / chroot.tar

Copy this file over to the N9, and unpack it. I have rooted my N9, so I can do this as root to preserve all the permissions etc:

# mkdir root
# cd root
# tar -xf /sdcard/Download/chroot.tar
# cd ..

And how can there not be a tar utility in Android?? I had to build a static ‘tar’ for aarch64 using my existing aarch64 server, to run the above command. And and and how can there be no chroot utility either!? I ended up compiling that myself too yada yada.

After all that you can do:

# mount -o bind /dev root/dev
# mount -o bind /proc root/proc
# mount -o bind /sys root/sys
# PATH=/usr/bin:/bin LD_PRELOAD= chroot root /bin/bash

which gives me at least a Fedora 21 shell on Android.

Edit: A few further notes:

  1. When setting up a non-root user account inside the chroot, give it the same UID, GID and groups as the ordinary non-privileged Android user account. In particular it must be in the inet group, else network access is blocked.
  2. You may need to set up /etc/resolv.conf by hand in the chroot.

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libguestfs works on MIPS Creator (mipsel)

[Previous post about the MIPS Creator CI20]

Slowly, of course.

I had to compile supermin & qemu from upstream and download (but not install) a qemu-compatible Debian kernel. Then setting the following environment variables allows make quickcheck to pass:

$ cat localenv
export SUPERMIN=/home/rjones/d/supermin-mipsel/src/supermin
export LIBGUESTFS_HV=/home/rjones/d/qemu-mipsel/mipsel-softmmu/qemu-system-mipsel
export SUPERMIN_KERNEL=/home/rjones/d/libguestfs-mipsel/kernel/boot/vmlinux-3.16.0-0.bpo.4-4kc-malta
export SUPERMIN_KERNEL_VERSION=3.16.0-0.bpo.4-4kc-malta
export SUPERMIN_MODULES=/home/rjones/d/libguestfs-mipsel/kernel/lib/modules/3.16.0-0.bpo.4-4kc-malta/

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virt-builder Debian 8 (Jessie) image

Debian 8 was released a couple of days ago, and you can now install it through virt-builder.

Use --notes to read the release notes:

$ virt-builder debian-8 --notes

To build an image:

$ virt-builder debian-8 \
    --firstboot-command "dpkg-reconfigure openssh-server"

To boot it under libvirt:

$ virt-install --import \
  --name debian-8 --ram 2048 \
  --disk path=debian-8.img,format=raw --os-variant=debianwheezy

(At some point --os-variant=debianjessie will work, but virt-install doesn’t support it yet)

Update: This is how I ended up running Debian 8:

$ virt-builder debian-8 \
    --size=30G \
    --root-password PASSWORD \
    --edit '/etc/apt/sources.list: s/wheezy/jessie/g' \
    --run-command '
      apt-get -y install debian-keyring debian-archive-keyring
      apt-key update
    ' \
    --install emacs,nfs-common,sudo \
    --edit '/etc/ssh/sshd_config:
              s/^#PermitEmptyPasswords no/PermitEmptyPasswords yes/' \
    --firstboot FIRSTBOOT.sh
    --run-command 'update-rc.d virt-sysprep-firstboot defaults' \
    --run-command 'killall dbus-daemon cgmanager ||:'

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New in virt-v2v

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