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af9131cd10
Prefer the containerd snapshotter by using it by default for new installs and when no Docker data is present (e.g. after datadisk wipe). The snapshotter is enabled by a dockerd flag which is set when a flag file is present in the data partition. This flag file can be used also to opt-in for this snapshotter on legacy installs (high level API through OS Agent and Supervisor TBD), to migrate to the containerd snapshotter this file can be simply created manually. Testing shown no major problems when migrating, the old overlay2 folder can be (and should be - to avoid situations where the data disk might run out of space) deleted before the docker.service is started in the docker-prepare script. Note that there's no offline migration path, OS needs to be connected to the internet to re-download the images when migrating. This could be theoretically possible through docker image save/load functions but guarding for enough of space and other edge cases would be probably too complex to justify it. Refs #4252 Refs #4253 - easier opt-in method is still needed Closes #4254 - migration is handled seamlessly by Docker