Verified on #427:
[root@nailgun etc]# cat /etc/fuel/version.yaml
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  api: "1.0"
  build_number: "427"
  build_id: "427"
  fuel-nailgun_sha: "9ebbaa0473effafa5adee40270da96acf9c7d58a"
  python-fuelclient_sha: "4f234669cfe88a9406f4e438b1e1f74f1ef484a5"
  fuel-agent_sha: "df16d41cd7a9445cf82ad9fd8f0d53824711fcd8"
  fuel-nailgun-agent_sha: "92ebd5ade6fab60897761bfa084aefc320bff246"
  astute_sha: "c7ca63a49216744e0bfdfff5cb527556aad2e2a5"
  fuel-library_sha: "fae42170a54b98d8e8c8db99b0fbb312633c693c"
  fuel-ostf_sha: "214e794835acc7aa0c1c5de936e93696a90bb57a"
  fuel-mirror_sha: "b62f3cce5321fd570c6589bc2684eab994c3f3f2"
  fuelmenu_sha: "85de57080a18fda18e5325f06eaf654b1b931592"
  shotgun_sha: "63645dea384a37dde5c01d4f8905566978e5d906"
  network-checker_sha: "9f0ba4577915ce1e77f5dc9c639a5ef66ca45896"
  fuel-upgrade_sha: "616a7490ec7199f69759e97e42f9b97dfc87e85b"
  fuelmain_sha: "e8e36cff332644576d7853c80b8a53d5b955420a"

[root@nailgun etc]# fuel-bootstrap build
Try to build image with data:
bootstrap:
  container: {format: tar.gz, meta_file: metadata.yaml}
  extend_kopts: biosdevname=0 net.ifnames=1 debug ignore_loglevel log_buf_len=10M
    print_fatal_signals=1 LOGLEVEL=8
  extra_files: [/usr/share/fuel_bootstrap_cli/files/trusty]
  label: 291768e3-de70-449a-98ff-edb58c09ebad
  modules:
  - {mask: kernel, name: kernel, uri: 'http://127.0.0.1:8080/bootstraps/291768e3-de70-449a-98ff-edb58c09ebad/vmlinuz'}
  - {compress_format: xz, mask: initrd, name: initrd, uri: 'http://127.0.0.1:8080/bootstraps/291768e3-de70-449a-98ff-edb58c09ebad/initrd.img'}
  - &id001 {compress_format: xz, container: raw, format: ext4, mask: rootfs, name: rootfs,
    uri: 'http://127.0.0.1:8080/bootstraps/291768e3-de70-449a-98ff-edb58c09ebad/root.squashfs'}
  post_script_file: null
  root_ssh_authorized_file: /root/.ssh/id_rsa.pub
  uuid: 291768e3-de70-449a-98ff-edb58c09ebad
codename: trusty
image_data:
  /: *id001
output: /tmp/291768e3-de70-449a-98ff-edb58c09ebad.tar.gz
packages: [squashfs-tools, nailgun-agent, nailgun-mcagents, live-boot, live-boot-initramfs-tools,
  i40e-dkms, vim, fuel-agent, mcollective, xz-utils, msmtp-mta, wget, hpsa-dkms, openssh-client,
  mc, ntp, linux-firmware, linux-firmware-nonfree, network-checker, openssh-server,
  linux-headers-generic, linux-image-generic-lts-trusty, ubuntu-minimal]
proxies: {}
repos:
- {name: ubuntu, priority: null, section: main universe multiverse, suite: trusty,
  type: deb, uri: 'http://archive.ubuntu.com/ubuntu'}
- {name: ubuntu-updates, priority: null, section: main universe multiverse, suite: trusty-updates,
  type: deb, uri: 'http://archive.ubuntu.com/ubuntu'}
- {name: ubuntu-security, priority: null, section: main universe multiverse, suite: trusty-security,
  type: deb, uri: 'http://archive.ubuntu.com/ubuntu'}
- {name: mos, priority: 1050, section: main restricted, suite: mos8.0, type: deb,
  uri: 'http://127.0.0.1:8080/ubuntu/x86_64'}
- {name: mos-updates, priority: 1050, section: main restricted, suite: mos8.0-updates,
  type: deb, uri: 'http://mirror.fuel-infra.org/mos-repos/ubuntu/8.0'}
- {name: mos-security, priority: 1050, section: main restricted, suite: mos8.0-security,
  type: deb, uri: 'http://mirror.fuel-infra.org/mos-repos/ubuntu/8.0'}
- {name: mos-holdback, priority: 1100, section: main restricted, suite: mos8.0-holdback,
  type: deb, uri: 'http://mirror.fuel-infra.org/mos-repos/ubuntu/8.0'}

Build process is in progress. Usually it takes 15-20 minutes. It depends on your internet connection and hardware performance.
--- Building bootstrap image (do_mkbootstrap) ---
*** Preparing image space ***
Installing BASE operating system into image
Starting new HTTP connection (1): 127.0.0.1
Starting new HTTP connection (1): mirror.fuel-infra.org
Starting new HTTP connection (1): mirror.fuel-infra.org
Starting new HTTP connection (1): mirror.fuel-infra.org
Building initramfs
Building squashfs
squashfs_image clean-up
Creating archive: /tmp/291768e3-de70-449a-98ff-edb58c09ebad.tar.gz
--- Building bootstrap image END (do_mkbootstrap) ---
Cleanup chroot
Bootstrap image 291768e3-de70-449a-98ff-edb58c09ebad has been built: /tmp/291768e3-de70-449a-98ff-edb58c09ebad.tar.gz