sync to multiple registries

[jduepmeier]

I like to sync images from various registries to multiple other registries.

Today I use the skopeo sync command with a yaml file for the source but I must use different calls to sync the images to the different target registries.
The problem here is that the images must be pulled several times.

It would be nice to define the target registries in a yaml file like the one for the source registries.
Then the command can fetch the images once.

I thought about storing the images first in a directory but this means i need more local disk space.

[mtrmac]

Thanks for reaching out.

Well, that’s an ~unavoidable trade-off: Currently skopeo sync is streaming copies, i.e. it does not require any disk space, but then two copies from the same source to different destinations read from the source twice.

Alternatively, it could copy from source to disk once, and once from disk to each of the destinations.

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I can just imagine a streaming implementation that reads from the source once, and pushes data to both destinations simultaneously (at the speed of the slower one) — but that would be very different copy implementation than the one we use now. It could plausibly be built, using an indirection ImageDestination that collects multiple actual destinations and distributes every write to them…

It’s not something that exists and it feels a bit tricky to make that reliable. I’m a bit doubtful that this fairly unusual case warrants that effort and risk — it’s worth tracking at least.

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