---

apk_tools_version: v2.12.10
apk_tools_arch: x86_64
apk_tools_url: https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic//{{ apk_tools_version }}/{{ apk_tools_arch }}/apk.static
apk_tools_checksum: sha256:d7506bb11327b337960910daffed75aa289d8bb350feab624c52965be82ceae8

alpine_version: edge
alpine_mirror: http://dl-cdn.alpinelinux.org/alpine
alpine_repositories: [ main, community, testing ]

boot_size: +100m
root_size: '0'
hostname: alpine-k8s

packages:
  # Alpine base system
  openssh: ''
  syslinux: ''
  linux-virt: ''
  sudo: '@community'
  vim: ''

  cloud-init: '@community'
  e2fsprogs-extra: ''
  py3-pyserial: '@community'
  py3-netifaces: '@community'

  wireguard-tools: ''

  # K8s requirements
  # OpenEBS
  open-iscsi: ''
  open-iscsi-openrc: ''
  udev: ''

  cni-plugin-flannel: '@community'
  cni-plugins: '@community'
  flannel: '@testing'
  flannel-contrib-cni: '@testing'
  docker: '@community'
  uuidgen: ''
  nfs-utils: ''

  kubelet: '@testing=1.25.0-r4'
  kubeadm: '@testing=1.25.0-r4'
  kubectl: '@testing=1.25.0-r4'

services:
  devfs: sysinit
  dmesg: sysinit
  hwdrivers: sysinit
  udev: sysinit

  hwclock: boot
  modules: boot
  sysctl: boot
  hostname: boot
  bootmisc: boot
  syslog: boot
  networking: boot

  mount-ro: shutdown
  killprocs: shutdown
  savecache: shutdown

  sshd: default

  # K8s requirements
  docker: default
  iscsid: default
  kubelet: default
  ntpd: default

nameservers:
  - 185.12.64.1
  - 185.12.64.2
  - 2a01:4ff:ff00::add:1
  - 2a01:4ff:ff00::add:2

sysctl: {}

extlinux_modules:
  - ext4

kernel_features:
  - base
  - ext4
  - keymap
  - virtio

kernel_modules:
  - ipv6
  - af_packet

default_kernel_opts:
  - quiet

chroot_commands:
  # kernel stuff
  - 'echo "br_netfilter" >/etc/modules-load.d/k8s.conf'
  - 'echo "net.bridge.bridge-nf-call-iptables=1" >>/etc/sysctl.conf'

  # Fix prometheus errors
  - 'echo -e "#!/bin/sh\nmount --make-rshared /" >/etc/local.d/sharemetrics.start'
  - 'chmod +x /etc/local.d/sharemetrics.start'
  - 'rc-update add local'

  # Enable private interface
  - 'echo "network: {config: disabled}" >/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg'
  - 'echo -e "auto lo\niface lo inet loopback\n" >/etc/network/interfaces'
  - 'echo -e "auto eth0\niface eth0 inet dhcp\niface eth0 inet6 auto\n" >>/etc/network/interfaces'
  - 'echo -e "auto eth1\niface eth1 inet dhcp\niface eth1 inet6 auto\n" >>/etc/network/interfaces'

  # Force --cloud-provider=external
  - "sed -i 's/command_args=\"/command_args=\"--cloud-provider=external /' /etc/init.d/kubelet"

...