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Afterburn on CoreOS Container Linux

This is a small utility, typically used in conjunction with Ignition, which reads metadata from a given cloud-provider and applies it to the system. This can include adding SSH keys and writing cloud-specific attributes into an environment file (e.g. /run/metadata/coreos), which can then be consumed by systemd service units via EnvironmentFile=.

On Container Linux, for historical reasons, Afterburn is usually called "coreos-metadata".

Afterburn can be built with the cl-legacy feature to enable legacy behavior for Container Linux. Other distros should not enable this feature.

Support

On Container Linux, the supported cloud providers and their respective metadata are as follows:

  • azure
    • SSH Keys
    • Attributes
      • COREOS_AZURE_IPV4_DYNAMIC
      • COREOS_AZURE_IPV4_VIRTUAL
      • COREOS_AZURE_VMSIZE
  • cloudstack-configdrive
    • SSH Keys
    • Attributes
      • COREOS_CLOUDSTACK_AVAILABILITY_ZONE
      • COREOS_CLOUDSTACK_INSTANCE_ID
      • COREOS_CLOUDSTACK_SERVICE_OFFERING
      • COREOS_CLOUDSTACK_CLOUD_IDENTIFIER
      • COREOS_CLOUDSTACK_LOCAL_HOSTNAME
      • COREOS_CLOUDSTACK_VM_ID
  • cloudstack-metadata
    • SSH Keys
    • Attributes
      • COREOS_CLOUDSTACK_AVAILABILITY_ZONE
      • COREOS_CLOUDSTACK_CLOUD_IDENTIFIER
      • COREOS_CLOUDSTACK_HOSTNAME
      • COREOS_CLOUDSTACK_INSTANCE_ID
      • COREOS_CLOUDSTACK_IPV4_LOCAL
      • COREOS_CLOUDSTACK_IPV4_PUBLIC
      • COREOS_CLOUDSTACK_LOCAL_HOSTNAME
      • COREOS_CLOUDSTACK_PUBLIC_HOSTNAME
      • COREOS_CLOUDSTACK_SERVICE_OFFERING
      • COREOS_CLOUDSTACK_VM_ID
  • digitalocean
    • SSH Keys
    • Network Configs
    • Attributes
      • COREOS_DIGITALOCEAN_HOSTNAME
      • COREOS_DIGITALOCEAN_IPV4_ANCHOR_0
      • COREOS_DIGITALOCEAN_IPV4_PUBLIC_0
      • COREOS_DIGITALOCEAN_IPV4_PRIVATE_0
      • COREOS_DIGITALOCEAN_IPV6_PUBLIC_0
      • COREOS_DIGITALOCEAN_IPV6_PRIVATE_0
      • COREOS_DIGITALOCEAN_REGION
  • ec2
    • SSH Keys
    • Attributes
      • COREOS_EC2_HOSTNAME
      • COREOS_EC2_PUBLIC_HOSTNAME
      • COREOS_EC2_IPV4_LOCAL
      • COREOS_EC2_IPV4_PUBLIC
      • COREOS_EC2_AVAILABILITY_ZONE
      • COREOS_EC2_INSTANCE_ID
      • COREOS_EC2_INSTANCE_TYPE
      • COREOS_EC2_REGION
  • gce
    • SSH Keys
    • Attributes
      • COREOS_GCE_HOSTNAME
      • COREOS_GCE_IP_EXTERNAL_0
      • COREOS_GCE_IP_LOCAL_0
      • COREOS_GCE_MACHINE_TYPE
  • openstack-metadata
    • SSH Keys
    • Attributes
      • COREOS_OPENSTACK_HOSTNAME
      • COREOS_OPENSTACK_IPV4_LOCAL
      • COREOS_OPENSTACK_IPV4_PUBLIC
      • COREOS_OPENSTACK_INSTANCE_ID
      • COREOS_OPENSTACK_INSTANCE_TYPE
  • packet
    • SSH Keys
    • Network Configs
    • Attributes
      • COREOS_PACKET_HOSTNAME
      • COREOS_PACKET_PLAN
      • COREOS_PACKET_IPV4_PUBLIC_0
      • COREOS_PACKET_IPV4_PRIVATE_0
      • COREOS_PACKET_IPV6_PUBLIC_0
  • vagrant-virtualbox
    • Attributes
      • COREOS_VAGRANT_VIRTUALBOX_PRIVATE_IPV4
      • COREOS_VAGRANT_VIRTUALBOX_HOSTNAME

Additionally, some attribute names are reserved for usage by custom metadata providers. These can be safely used by external providers on a platform not supported by Afterburn:

  • custom
    • Attributes
      • COREOS_CUSTOM_HOSTNAME
      • COREOS_CUSTOM_PUBLIC_IPV4
      • COREOS_CUSTOM_PRIVATE_IPV4
      • COREOS_CUSTOM_PUBLIC_IPV6
      • COREOS_CUSTOM_PRIVATE_IPV6