vftool ubuntu - aarch64

firstly, build vftool (via make or xcode, whatever)

cd build

mkdir vm

# grab needed things:

curl -o - https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-arm64-vmlinuz-generic | gunzip > vm/vmlinuz

curl -o vm/initrd https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-arm64-initrd-generic

curl -o - https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-arm64.tar.gz | tar zxvC vm

# grow disk

dd if=/dev/zero of=vm/focal-server-cloudimg-arm64.img seek=20000000 obs=1024 count=0

# boot VM to ramdisk

./vftool -k vm/vmlinuz -i vm/initrd -d vm/focal-server-cloudimg-arm64.img -m 6144 -a "console=hvc0"

# connect via screen - boots to initramfs

# paste the following:

mkdir /mnt
mount /dev/vda /mnt
chroot /mnt

touch /etc/cloud/cloud-init.disabled

echo 'root:root' | chpasswd

ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
ssh-keygen -f /etc/ssh/ssh_host_ed25519_key -N '' -t ed25519

cat <<EOF > /etc/netplan/01-dhcp.yaml 
network:
    renderer: networkd
    ethernets:
        enp0s1:
            dhcp4: true
    version: 2
EOF

# and now add the host's ssh key:

mkdir /root/.ssh
cat <<EOF > /root/.ssh/authorized_keys
< paste id_rsa.pub contents, followed by ‘EOF’ >
EOF

# and bail out
exit
umount /dev/vda

# and ctrl-c the vftool session to kill the VM

# and now boot properly:

./vftool -k vm/vmlinuz -i vm/initrd -d vm/focal-server-cloudimg-arm64.img -m 6144 -a "console=hvc0 root=/dev/vda"

# attach screen again

# login with root/root

# fix filesystem size
resize2fs /dev/vda

# ready for use! 

# find guest IP
ip address | grep 192

# from outside, you can ssh directly as root to that IP

vftool ubuntu - x86_64

firstly, build vftool (via make or xcode, whatever)

cd build

mkdir vm

# grab needed things:

curl -o vm/vmlinuz https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-amd64-vmlinuz-generic

curl -o vm/initrd https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-amd64-initrd-generic

curl -o - https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-amd64.tar.gz | tar zxvC vm

# grow disk

dd if=/dev/zero of=vm/focal-server-cloudimg-amd64.img seek=20000000 obs=1024 count=0

# boot VM to ramdisk

./vftool -k vm/vmlinuz -i vm/initrd -d vm/focal-server-cloudimg-amd64.img -m 6144 -a "console=hvc0"

# connect via screen - boots to initramfs

# paste the following:

mkdir /mnt
mount /dev/vda /mnt
chroot /mnt

touch /etc/cloud/cloud-init.disabled

echo 'root:root' | chpasswd

ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
ssh-keygen -f /etc/ssh/ssh_host_ed25519_key -N '' -t ed25519

cat <<EOF > /etc/netplan/01-dhcp.yaml 
network:
    renderer: networkd
    ethernets:
        enp0s1:
            dhcp4: true
    version: 2
EOF

# and now add the host's ssh key:

mkdir /root/.ssh
cat <<EOF > /root/.ssh/authorized_keys
< paste id_rsa.pub contents, followed by ‘EOF’ >
EOF

# and bail out
exit
umount /dev/vda

# and ctrl-c the vftool session to kill the VM

# and now boot properly:

./vftool -k vm/vmlinuz -i vm/initrd -d vm/focal-server-cloudimg-amd64.img -m 6144 -a "console=hvc0 root=/dev/vda"

# attach screen again

# login with root/root

# fix filesystem size
resize2fs /dev/vda

# ready for use! 

# find guest IP
ip address | grep 192

# from outside, you can ssh directly as root to that IP