CreateVagrantBoxFromQCOW2

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Machine Preparation

Create a libvirt machine, install system.

Add user vagrant:

# adduser vagrant
# visudo -f /etc/sudoers.d/vagrant
vagrant ALL=(ALL) NOPASSWD:ALL
# visudo
vagrant ALL=(ALL) NOPASSWD:ALL
Defaults:vagrant	!requiretty
# mkdir -p /home/vagrant/.ssh
# chmod 0700 /home/vagrant/.ssh
# wget --no-check-certificate \
https://raw.github.com/mitchellh/vagrant/master/keys/vagrant.pub \
-O /home/vagrant/.ssh/authorized_keys
# chmod 0600 /home/vagrant/.ssh/authorized_keys
# chown -R vagrant /home/vagrant/.ssh
# vim /home/vagrant/.profile
add
[ -z "$BASH_VERSION" ] && exec /bin/bash -l
# chsh -s /bin/bash vagrant

Change the ethernet card from ens* to eth0:

# vim /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quite"
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"
# grub-mkconfig -o /boot/grub/grub.cfg

Change the netplan rules:

# vim /etc/netplan/01-netcfg.yaml 
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: yes
      dhcp-identifier: mac

Finally change the sshd configuration:

# vim /etc/ssh/sshd_config 
AuthorizedKeysFile .ssh/authorized_keys

For 20.04, you have to manually install ifupdown:

# apt-get install -y ifupdown

Now shutdown the machine, continue for packaging.

Packaging

Shrinking the qcow2 file:

# qemu-img convert -c -O qcow2 test180403.qcow2 test180403shrunk.qcow2
# mv test180403shrunk.qcow2 box.img
# vim metadata.json
{
"provider"     : "libvirt",
"format"       : "qcow2",
"virtual_size" : 40
}
# vim Vagrantfile
Vagrant.configure("2") do |config|
       config.vm.provider :libvirt do |libvirt|
       libvirt.driver = "kvm"
       libvirt.host = 'localhost'
       libvirt.uri = 'qemu:///system'
       end
config.vm.define "new" do |custombox|
       custombox.vm.box = "custombox"
       custombox.vm.provider :libvirt do |test|
       test.memory = 1024
       test.cpus = 1
       end
       end
end
# tar cvzf custom_box.box ./metadata.json ./Vagrantfile ./box.img

Testing

Add vagrant box via:

# vagrant box add custom_box.box --name "chuobi"
# vagrant init chuobi
# vagrant up --provider=libvirt