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os-bootstrap

Bootstrapping Linux OSes, specifically Fedora and Ubuntu

Example Build

Notes:

  • Disk controller and disk options were chosen as disks sitting on LVM with SSD drives and trim support was desired.

Ubuntu VM

VM_NAME="${VM_NAME:-vm-default}"
qemu-img create -f qcow2 /var/lib/libvirt/images/${VM_NAME}.qcow2 8G

# Need to prevent reboot at end of installation
virt-install --connect qemu:///system --virt-type kvm --accelerate \
  --name ${VM_NAME} \
  --os-type=linux --os-variant ubuntu16.04 \
  --ram 1024 --vcpus 2 \
  --controller scsi,model=virtio-scsi \
  --disk path=/var/lib/libvirt/images/${VM_NAME}.qcow2,format=qcow2,bus=scsi,cache=writethrough,discard=unmap \
  --network network=default,model=virtio \
  --console pty,target_type=serial \
  --watchdog default \
  --memballoon virtio \
  --autostart \
  --location http://archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/ \
  --extra-args 'console=ttyS0,115200n8 serial auto=true priority=critical debian-installer/allow_unauthenticated_ssl=true
    url=https://raw.githubusercontent.com/digitalr00ts/os-bootstrap/master/ubuntu/xenial.cfg'

# Have not found a way to enable autodeflate w/ virt-install
sed -i'' "s/<memballoon model='virtio'>/<memballoon model='virtio' autodeflate='on'>/" /etc/libvirt/qemu/${VM_NAME}.xml

modprobe nbd max_part=8
qemu-nbd --connect=/dev/nbd0 /var/lib/libvirt/images/${VM_NAME}.qcow2
#partprobe /dev/nbd0
mkdir -p /mnt/vm-image/
mount /dev/ubuntu-vg/root /mnt/vm-image/
mount /dev/nbd0p1 /mnt/vm-image/boot
chroot /mnt/vm-image/
export PATH="/bin:${PATH}"
#mount --bind /dev/ /mnt/dev
#mount -t proc none /proc
#mount -t sysfs none /sys

ln -s /lib/systemd/system/[email protected] /etc/systemd/system/getty.target.wants/[email protected]

sed -i 's/quiet splash//' /etc/default/grub

# https://help.ubuntu.com/community/Installation/LowMemorySystems
echo 'DISABLED_MODULES="ath_hal fc fglrx fwlanusb ltm nv"' >> /etc/default/linux-restricted-modules-common

#disable hibernate
rm /etc/initramfs-tools/conf.d/resume
update-initramfs -u

#umount /proc/ /sys/ /dev/
exit

umount -R /mnt
qemu-nbd -d /dev/nbd0

Fedora VM

VM_NAME="${VM_NAME:-vm-default}"
qemu-img create -f qcow2 /var/lib/libvirt/images/${VM_NAME}.qcow2 8G

virt-install --connect qemu:///system --virt-type kvm --accelerate \
  --name ${VM_NAME} \
  --os-type=linux --os-variant fedora26 \
  --ram 1024 --vcpus 2 \
  --controller scsi,model=virtio-scsi \
  --disk path=/var/lib/libvirt/images/${VM_NAME}.qcow2,format=qcow2,bus=scsi,cache=writethrough,discard=unmap \
  --network network=default,model=virtio \
  --console pty,target_type=serial \
  --watchdog default \
  --memballoon virtio \
  --autostart \
  --location https://dl.fedoraproject.org/pub/fedora/linux/releases/26/Everything/x86_64/os/ \
  --extra-args 'console=ttyS0, inst.text inst.sshd
    inst.ks=https://raw.githubusercontent.com/digitalr00ts/kickstart/f26/server-core.cfg'

# Add enabling ttyS0