Packer QEMU Pre-Seeded Debian Image

base.pkr.hcl

  variable "iso_url" {
  type    = string
  default = "https://cdimage.debian.org/cdimage/release/10.8.0/amd64/iso-cd/debian-10.8.0-amd64-netinst.iso"
}

variable "iso_checksum" {
  type    = string
  default = "file:https://cdimage.debian.org/cdimage/release/10.8.0/amd64/iso-cd/MD5SUMS"
}

# "timestamp" template function replacement
locals { timestamp = regex_replace(timestamp(), "[- TZ:]", "") }

source "qemu" "debian" {
  vm_name          = "debian.qcow2"
  format           = "qcow2"

  accelerator = "hvf"
  boot_wait   = "1s"
  headless    = true
  
  memory           = 1024
  disk_size        = "8192M"
  
  iso_url      = "${var.iso_url}"
  iso_checksum = "${var.iso_checksum}"
  
  ssh_password = "1234"
  ssh_username = "1234"
  ssh_timeout  = "1h"

  http_directory = "http"

  boot_command = [
    "<down><tab>",
    " auto-install/enable=true",
    " debconf/priority=critical",
    " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg<wait>",
    " -- <wait>",
    "<enter><wait>"
  ]

  disk_compression = true
  disk_discard     = "unmap"
}

build {
  sources = ["source.qemu.debian"]
}

preseed.cfg

# Preseeding only locale sets language, country and locale.
d-i debian-installer/locale string en_US

# Keyboard selection.
d-i console-setup/ask_detect boolean false
d-i keyboard-configuration/xkb-keymap select us

choose-mirror-bin mirror/http/proxy string

### Clock and time zone setup
d-i clock-setup/utc boolean true
d-i time/zone string UTC

# Avoid that last message about the install being complete.
d-i finish-install/reboot_in_progress note

# Pre-select the device to install grub
d-i grub-installer/bootdev string /dev/vda

# This is fairly safe to set, it makes grub install automatically to the MBR
# if no other operating system is detected on the machine.
d-i grub-installer/only_debian boolean true

# This one makes grub-installer install to the MBR if it also finds some other
# OS, which is less safe as it might not be able to boot that other OS.
d-i grub-installer/with_other_os boolean true

### Mirror settings
# If you select ftp, the mirror/country string does not need to be set.
d-i mirror/country string manual
d-i mirror/http/directory string /debian
d-i mirror/http/hostname string deb.debian.org
d-i mirror/http/proxy string

### Partitioning
d-i partman-auto/method string lvm

# This makes partman automatically partition without confirmation.
d-i partman-md/confirm boolean true
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i	partman-lvm/confirm_nooverwrite	boolean	true

### Root setup
d-i passwd/root-password password 1234
d-i passwd/root-password-again password 1234

### Account setup
d-i passwd/user-fullname string vagrant
d-i passwd/user-uid string 1000
d-i passwd/user-password password vagrant
d-i passwd/user-password-again password vagrant
d-i passwd/username string vagrant

# The installer will warn about weak passwords. If you are sure you know
# what you're doing and want to override it, uncomment this.
d-i user-setup/allow-password-weak boolean true
d-i user-setup/encrypt-home boolean false

### Package selection
tasksel tasksel/first multiselect ssh-server
d-i pkgsel/include string build-essential
d-i pkgsel/install-language-support boolean false

# disable automatic package updates
d-i pkgsel/update-policy select none
d-i pkgsel/upgrade select full-upgrade