Example Ignition Configs

btrfs-etcd.json

{
    "ignitionVersion": 1,
    "storage": {
        "filesystems": [
            {
                "device": "/dev/disk/by-label/ROOT",
                "format": "btrfs",
                "create": {
                    "force": true,
                    "options": [
                        "--label=ROOT"
                    ]
                }
            }
        ]
    },
    "systemd": {
        "units": [
            {
                "name": "etcd2.service",
                "enable": true,
                "dropins": [
                    {
                        "name": "metadata.conf",
                        "contents": "[Unit]\nRequires=coreos-metadata.service\nAfter=coreos-metadata.service\n\n[Service]\nEnvironmentFile=/run/metadata/coreos\nExecStart=\nExecStart=/usr/bin/etcd2 --advertise-client-urls=http://${COREOS_IPV4_PUBLIC}:2379 --initial-advertise-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 --listen-client-urls=http://0.0.0.0:2379 --listen-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 --initial-cluster=${ETCD_NAME}=http://${COREOS_IPV4_LOCAL}:2380"
                    }
                ]
            }
        ]
    }
}

btrfs.json

{
    "ignitionVersion": 1,
    "storage":         {
        "filesystems": [
            {
                "device": "/dev/disk/by-label/ROOT",
                "format": "btrfs",
                "create": {
                    "force": true,
                    "options": [
                        "--label=ROOT"
                    ]
                },
                "files":[
                    {
                        "path":     "/alex",
                        "contents": "hello",
                        "mode":     420
                    }
                ]
            }
        ]
    }
}

etcd-metadata.yml

ignition_version: 1

systemd:
  units:
    - name: "etcd2.service"
      enable: true
      dropins:
        - name: "metadata.conf"
          contents: |
            [Unit]
            Requires=metadata.service
            After=metadata.service

            [Service]
            EnvironmentFile=/run/metadata/ec2
            ExecStart=
            ExecStart=/usr/bin/etcd2 \
                --advertise-client-urls=http://${COREOS_IPV4_PUBLIC}:2379 \
                --initial-advertise-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 \
                --listen-client-urls=http://0.0.0.0:2379 \
                --listen-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 \
                --initial-cluster=${ETCD_NAME}=http://${COREOS_IPV4_LOCAL}:2380

    - name: "metadata.service"
      contents: |
        [Unit]
        Description=EC2 metadata agent

        [Service]
        Type=oneshot
        Environment=OUTPUT=/run/metadata/ec2
        ExecStart=/usr/bin/mkdir --parent /run/metadata
        ExecStart=/usr/bin/bash -c 'echo "COREOS_IPV4_PUBLIC=$(curl\
            --url http://169.254.169.254/2009-04-04/meta-data/public-ipv4\
            --retry 10)\nCOREOS_IPV4_LOCAL=$(curl\
            --url http://169.254.169.254/2009-04-04/meta-data/local-ipv4\
            --retry 10)" > ${OUTPUT}'

etcd.json

{
    "ignitionVersion": 1,
    "systemd":         {
        "units": [
            {
                "name":    "etcd2.service",
                "enable":  true,
                "dropins": [
                    {
                        "name":     "metadata.conf",
                        "contents": "[Unit]\nRequires=coreos-metadata.service\nAfter=coreos-metadata.service\n\n[Service]\nEnvironmentFile=/run/metadata/coreos\nExecStart=\nExecStart=/usr/bin/etcd2 --advertise-client-urls=http://${COREOS_IPV4_PUBLIC}:2379 --initial-advertise-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 --listen-client-urls=http://0.0.0.0:2379 --listen-peer-urls=http://${COREOS_IPV4_LOCAL}:2380 --initial-cluster=${ETCD_NAME}=http://${COREOS_IPV4_LOCAL}:2380"
                    }
                ]
            }
        ]
    }
}

noop.json

{
    "ignitionVersion": 1
}

raid.json

{
    "version": 1,
    "storage": {
        "disks": [
            {   
                "device": "/dev/mmcblk0",
                "partitions": [
                    {   
                        "label": "raid.1.1",
                        "number": 1,
                        "size": "+20480",
                        "start": "0"
                    },
                    {   
                        "label": "raid.1.2",
                        "number": 2,
                        "size": "+20480",
                        "start": "0"
                    },
                    {   
                        "label": "raid.1.3",
                        "number": 3,
                        "size": "+20480",
                        "start": "0"
                    }
                ],
                "wipe-table": true
            }
        ],
        "raid": [
            {   
                "devices": [
                    "/dev/disk/by-partlabel/raid.1.1",
                    "/dev/disk/by-partlabel/raid.1.2",
                    "/dev/disk/by-partlabel/raid.1.3"
                ],
                "level": "stripe",
                "name": "md0"
            }
        ],
        "filesystems": [
            {   
                "device": "/dev/md0",
                "format": "ext4"
            }
        ]
    }
}