container-linux.json

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

    "builders": [
        {
            "type": "qemu",
            "iso_url": "https://{{user `release` }}.release.core-os.net/amd64-usr/current/coreos_production_iso_image.iso",
            "iso_checksum": "{{ user `iso_checksum` }}",
            "iso_checksum_type": "{{ user `iso_checksum_type` }}",
            "output_directory": "builds",
            "shutdown_command": "sudo shutdown now",
            "disk_size": "{{ user `disk_size` }}",
            "format": "qcow2",
            "accelerator": "kvm",
            "vm_name": "container-linux-{{user `release` }}.qcow2",
            "boot_wait": "{{user `boot_wait` }}",
            "ssh_username": "core",
            "ssh_password": "packer",
            "boot_command": [
                "sudo passwd core<enter><wait>",
                "packer<enter>",
                "packer<enter>",
                "sudo systemctl start sshd.service<enter>"
            ],
            "qemuargs": [
                [ "-m", "{{user `memory` }}" ]
            ]
        }
    ],

    "provisioners": [
        {
            "type": "file",
            "source": "{{ user `ignition` }}",
            "destination": "/tmp/ignition.json"
        },
        {
            "type": "shell",
            "inline": [
                "sudo coreos-install -d /dev/vda -C {{ user `release` }} -i /tmp/ignition.json"
            ]
        }
    ]
}