Hi,
I'm exploring the world of containers combined with Yocto. I can build a
container image and bundle that one with my rootfs image. The container
image is stored in the rootfs as a tar-file of a OCI image spec with the
content blobs, index.json and oci-layout. As per the description in
classes/image-oci.bbclass the way to run the container is to unpack the
file and the create the OCI runtime bundle and start it with runc.
I have played around with docker and tried to import OCI image directly
in to docker store but have not succeeded. Anyone that knows if it is
possible? 'docker image import <oci-image>.tar does not give any errors
and the image shows up in 'docker images' but does not import the
correct rootfs.
When creating the OCI image in image-oci.bbclass the process starts with
a bundle that is packaged as an image and compressed to a tar-file.
Given the above the whole process needs to be reverted on target to
start a container from that image. It should then be possible to just
install the bundle directly on target rootfs that directly can be
started with runc. Are there any drawbacks with this? I can see that a
tar-file is easier to distribute and install afterwards but my question
related to directly integrating an OCI-image to a Yocto rootfs-image.
Best regards,
/Peter
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