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mediatypes.md

File metadata and controls

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Media Types

All artifacts in an OCI registry are required to have a media type. This is used both on the blob itself, as well as in the manifest that points to the blobs.

When a registry supports it, i.e. the default artifacts mode, we use custom mediatypes to reflect the content. These are as follows:

  • config: application/vnd.lfedge.eci.config.v1+json
  • kernel: application/vnd.lfedge.eci.kernel.layer.v1.tar
  • initrd: application/vnd.lfedge.eci.initrd.layer.v1.tar
  • disks: disks always have a media type that conforms to their format
    • raw: application/vnd.lfedge.disk.layer.v1+raw
    • vhd: application/vnd.lfedge.disk.layer.v1+vhd
    • vmdk: application/vnd.lfedge.disk.layer.v1+vmdk
    • iso: application/vnd.lfedge.disk.layer.v1+iso
    • qcow: application/vnd.lfedge.disk.layer.v1+qcow
    • qcow2: application/vnd.lfedge.disk.layer.v1+qcow2
    • ova: application/vnd.lfedge.disk.layer.v1+ova
    • vhdx: application/vnd.lfedge.disk.layer.v1+vhdx

When a registry does not support using custom mediatypes, we operate in legacy mode and use the following media types acceptable to all registries:

  • config: application/vnd.oci.image.config.v1+json
  • layers: application/vnd.oci.image.layer.v1.tar