Packer QEMU image builder for CoreOS's Container Linux

A basic Packer template, Makefile and cloud config file to get started building QEMU images for CoreOS Container Linux.

Installation

$ git clone https://github.com/dyson/packer-qemu-coreos-container-linux.git .
$ cd packer-qemu-coreos-container-linux
$ cp container-linux-config.yml.example container-linux-config.yml

Installing ct

CoreOS Container Linux is moving away from the cloud-config file format and over to the container linux config and ignition formats. Ignition files use JSON and are transpiled from a container linux config YAML file. The ct tool is used to do this and the Makefile includes some convenient targets to install, update, and delete this tool for linux hosts. Requires root to install the binary into /usr/local/bin. If you already have ct installed you can skip these steps.

Install:

$ make ct

Update:

$ make ct-update

Delete:

$ make ct-clean

Usage

Populate your container linux config YAML file with all configuration you want apply in the installed image.

With Makefile

Makefile variables

PACKER_CMD ?= packer
RELEASE ?= alpha
DIGEST_URL ?= https://$(RELEASE).release.core-os.net/amd64-usr/current/coreos_production_iso_image.iso.DIGESTS
CONFIG ?= container-linux-config.yml
DISK_SIZE ?= 40000
MEMORY ?= 2048M
BOOT_WAIT ?= 45s

Basic example using defaults

$ make container-linux

Building the alpha release

$ make container-linux RELEASE=alpha

Other make targets

Delete builds:

$ make clean

Delete the packer cache (making packer download the latest iso image on next build):

$ make cache-clean

Without Makefile

Without buidling from the Makefile you will neet to obtain the iso checksum manually (or not varify it) and also transpile the container linux config into the ignition format before building.

Packer variables

"release": "stable",
"iso_checksum": "",
"iso_checksum_type": "none",
"disk_size": "40000",
"memory": "2048M",
"boot_wait": "45s",
"ignition": "ignition.json"

Basic example using defaults

$ packer build -force container-linux.json

Building the alpha release

$ packer build -force -var 'release=alpha' container-linux.json

License

See LICENSE file.