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Exporter: support nydus image export #2045

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Exporter: support nydus image export #2045

wants to merge 2 commits into from

Commits on Mar 30, 2021

  1. Exporter: support nydus image export 

    Nydus image is a container accelerated image format provided by the
Dragonfly image-service project, which offers the ability to pull image
data on demand, without waiting for the entire image pull to complete
and then start the container. It has been put in production usage and
shown vast improvements over the old OCI image format in terms of container
launching speed, image space, and network bandwidth efficiency, as well
as data integrity. The Nydus image can also serve as an example and
reference implementation for the on-going OCI image spec v2 discussion.

Nydus has provided a conversion tool Nydusify for converting OCI image to
Nydus image, which assumes that the OCI image is already available in the
registry, but a better way would be to build the Nydus images directly from
the build system instead of using the conversion tool, which would increase
the speed of the image export, so we experimentally integrated the Nydus
exporter in Buildkit.

Nydusify provides a package to do the actual image conversion. We use the
same package to implement the buildkit nydus exporter. The exporter mounts
all layers and calls the package to build to a Nydus image and push it to the
remote registry. The current implementation relies on the Nydus builder, which
is used to build a layer to a RAFS layer, and in the future, we can explore
simpler, less dependent integrations.

Signed-off-by: Yan Song <imeoer@linux.alibaba.com>
    @imeoer
    imeoer committed Mar 30, 2021
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  2. Add integration test for nydus exporter 

    Pack the nydus-image binary into integration image, export Nydus
image with Nydus exporter, and simply check.

Signed-off-by: Yan Song <imeoer@linux.alibaba.com>
    @imeoer
    imeoer committed Mar 30, 2021
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