crd: Add and use RuntimeClasses struct to associate a runtime to a snapshotter #250
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@bpradipt, @jensfr, we never ever discussed the possibility of having "experimental features", or things that we know they'll end up being dropped / rewritten in the long term. The approach I've decided to take is just naming it as ExperimentalFeature${FOO}, but I'd like to hear from you and understand what would be the best approach, considering your experience, to deal with such cases. |
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We never really discussed how to handle experimental features. For this specific case, since there could be different snapshotter configuration for a specific RuntimeClass, I was thinking should we change the RuntimeClassNames to a struct and add specifics like name, snapshotter config and any other required configs ? operator/api/v1beta1/ccruntime_types.go Line 163 in cce4aac |
RuntimeClassNames has been added as part of the commit e0ab5ae, but right now we need to actually map a runtime with the snapshotter it'll be using, forcing us to drop the RuntimeClassNames string from the CRD, and add a struct which will hold the Name and the Snapshotter to be used. This suggestion came from Pradipta Banerjee, and I appreciate a lot the way of handling this, and I'm assuming here changes on the CRD are not too problematic, as long as those are not done too often, while we're in the v1beta1 stage. Signed-off-by: Fabiano Fidêncio <[email protected]>
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I still have to learn how to properly patch a struct, but that's for Tomorrow. @bpradipt, thanks a ton for the suggestion, and I hope breaking backwards compat in v1beta1 is not a huge deal. |
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Yeah, till we release v1, we can be flexible |
For now, let's use "overlayfs", which is the default containerd snapshotter, and exactly what's been used till now as the snapshotter for the runtimeclasses. Later on, this will be adapted to using nydus / tardev. Signed-off-by: Fabiano Fidêncio <[email protected]>
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This is the Operator counter part of the following Kata Containers PR kata-containers/kata-containers#7715
The idea here is to expose a way that users can set a snapshotter to be used with the containerd runtime handler.
The reason I'm marking this feature, right now, as "ExperimentalFeature" is a way to indicate this will be changed, or even dropped, in the coming releases, as Kata Containers will actually expose a way to map a specific runtime handler to a specific snapshotter, rather than "set this snapshotter for all the runtime handlers" as currently done.
This will require folks using a new enough version of containerd (v1.7+), but I do believe this will be the case anyways with the work going on as part of removing the dependency on the containerd fork.