This builds a Vagrant Flatcar Container Linux flatcar-linux Base Box.

Usage

Install Packer (1.6+) and Vagrant (2.2.9+).

If you are on a Debian/Ubuntu host, you should also install and configure the NFS server. E.g.:

# install the nfs server.
sudo apt-get install -y nfs-kernel-server

# enable password-less configuration of the nfs server exports.
sudo bash -c 'cat >/etc/sudoers.d/vagrant-synced-folders' <<'EOF'
Cmnd_Alias VAGRANT_EXPORTS_CHOWN = /bin/chown 0\:0 /tmp/*
Cmnd_Alias VAGRANT_EXPORTS_MV = /bin/mv -f /tmp/* /etc/exports
Cmnd_Alias VAGRANT_NFSD_CHECK = /etc/init.d/nfs-kernel-server status
Cmnd_Alias VAGRANT_NFSD_START = /etc/init.d/nfs-kernel-server start
Cmnd_Alias VAGRANT_NFSD_APPLY = /usr/sbin/exportfs -ar
%sudo ALL=(root) NOPASSWD: VAGRANT_EXPORTS_CHOWN, VAGRANT_EXPORTS_MV, VAGRANT_NFSD_CHECK, VAGRANT_NFSD_START, VAGRANT_NFSD_APPLY
EOF

For more information see the Vagrant NFS documentation.

qemu-kvm usage

Install qemu-kvm:

apt-get install -y qemu-kvm
apt-get install -y sysfsutils
apt-get install -y rng-tools
systool -m kvm_intel -v

Type make build-libvirt and follow the instructions.

Try the example guest:

cd example
apt-get install -y virt-manager libvirt-dev
vagrant plugin install vagrant-libvirt # see https://github.com/vagrant-libvirt/vagrant-libvirt
vagrant up --provider=libvirt --no-destroy-on-error
vagrant ssh
exit
vagrant destroy -f

Packer boot_command

The following table describes the steps used to install flatcar-linux.

NB This Packer boot_command method of installation is quite brittle, if you are having trouble installing, try increasing the install wait timeout.

step	boot_command
switch to root	sudo -i<enter>
configure the shell to abort on error	set -eu<enter>
download the ignition configuration	wget -q http://{{.HTTPIP}}:{{.HTTPPort}}/tmp/ignition.json<enter><wait>
install to disk	time flatcar-install -d /dev/sda -C stable -i ignition.json<enter>
wait 3m for the installation to finish	<wait3m>
reboot to the installed system	reboot<enter>

Reference

• Installing Flatcar Container Linux to disk
• Configuration Specification