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/afterburn), which can then be consumed by systemd service units via EnvironmentFile=.

The supported cloud providers and their respective metadata are listed below. On CoreOS Container Linux, the supported providers and metadata are somewhat different.

• aws
  • SSH Keys
  • Attributes
    • AFTERBURN_AWS_HOSTNAME
    • AFTERBURN_AWS_PUBLIC_HOSTNAME
    • AFTERBURN_AWS_IPV4_LOCAL
    • AFTERBURN_AWS_IPV4_PUBLIC
    • AFTERBURN_AWS_AVAILABILITY_ZONE
    • AFTERBURN_AWS_INSTANCE_ID
    • AFTERBURN_AWS_REGION
• azure
  • SSH Keys
  • Attributes
    • AFTERBURN_AZURE_IPV4_DYNAMIC
    • AFTERBURN_AZURE_IPV4_VIRTUAL
• cloudstack-configdrive
  • SSH Keys
  • Attributes
    • AFTERBURN_CLOUDSTACK_AVAILABILITY_ZONE
    • AFTERBURN_CLOUDSTACK_INSTANCE_ID
    • AFTERBURN_CLOUDSTACK_SERVICE_OFFERING
    • AFTERBURN_CLOUDSTACK_CLOUD_IDENTIFIER
    • AFTERBURN_CLOUDSTACK_LOCAL_HOSTNAME
    • AFTERBURN_CLOUDSTACK_VM_ID
• cloudstack-metadata
  • SSH Keys
  • Attributes
    • AFTERBURN_CLOUDSTACK_AVAILABILITY_ZONE
    • AFTERBURN_CLOUDSTACK_CLOUD_IDENTIFIER
    • AFTERBURN_CLOUDSTACK_HOSTNAME
    • AFTERBURN_CLOUDSTACK_INSTANCE_ID
    • AFTERBURN_CLOUDSTACK_IPV4_LOCAL
    • AFTERBURN_CLOUDSTACK_IPV4_PUBLIC
    • AFTERBURN_CLOUDSTACK_LOCAL_HOSTNAME
    • AFTERBURN_CLOUDSTACK_PUBLIC_HOSTNAME
    • AFTERBURN_CLOUDSTACK_SERVICE_OFFERING
    • AFTERBURN_CLOUDSTACK_VM_ID
• digitalocean
  • SSH Keys
  • Network Configs
  • Attributes
    • AFTERBURN_DIGITALOCEAN_HOSTNAME
    • AFTERBURN_DIGITALOCEAN_IPV4_ANCHOR_0
    • AFTERBURN_DIGITALOCEAN_IPV4_PUBLIC_0
    • AFTERBURN_DIGITALOCEAN_IPV4_PRIVATE_0
    • AFTERBURN_DIGITALOCEAN_IPV6_PUBLIC_0
    • AFTERBURN_DIGITALOCEAN_IPV6_PRIVATE_0
    • AFTERBURN_DIGITALOCEAN_REGION
• gcp
  • SSH Keys
  • Attributes
    • AFTERBURN_GCP_HOSTNAME
    • AFTERBURN_GCP_IP_EXTERNAL_0
    • AFTERBURN_GCP_IP_LOCAL_0
• openstack-metadata
  • SSH Keys
  • Attributes
    • AFTERBURN_OPENSTACK_HOSTNAME
    • AFTERBURN_OPENSTACK_IPV4_LOCAL
    • AFTERBURN_OPENSTACK_IPV4_PUBLIC
    • AFTERBURN_OPENSTACK_INSTANCE_ID
• packet
  • SSH Keys
  • Network Configs
  • Attributes
    • AFTERBURN_PACKET_HOSTNAME
    • AFTERBURN_PACKET_IPV4_PUBLIC_0
    • AFTERBURN_PACKET_IPV4_PRIVATE_0
    • AFTERBURN_PACKET_IPV6_PUBLIC_0
• vagrant-virtualbox
  • Attributes
    • AFTERBURN_VAGRANT_VIRTUALBOX_PRIVATE_IPV4
    • AFTERBURN_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
    • AFTERBURN_CUSTOM_HOSTNAME
    • AFTERBURN_CUSTOM_PUBLIC_IPV4
    • AFTERBURN_CUSTOM_PRIVATE_IPV4
    • AFTERBURN_CUSTOM_PUBLIC_IPV6
    • AFTERBURN_CUSTOM_PRIVATE_IPV6