Buildx: What exactly can cache from and cache to do with remote registries (self own custom registries)?

[no1melman]

So from the documentation here https://github.com/docker/buildx#--cache-fromnametypetypekeyvalue

obviously a good point about docker is the layer caching, when you specify a remote for the cache from and cache to, two questions

1. Is that for the layer caching as well?
2. can you just specify the remote registry? or does it need to be remote registry and image name...

[tonistiigi]

1. Yes remote caching is for layers/instructions
2. You need to specify image name where you are importing from/exporting to

[no1melman]

Thanks for that, do you always need to do docker buildx build or can the commands be forwarded through to docker build ? I'm immediately guessing, absolutely not. But just thought I would clarify

[tonistiigi]

DOCKER_BUIDLKIT=1 docker build can import cache and supports creating images with inline cache. docker buildx install can replace the docker build with docker buildx build

[no1melman]

So when you say docker buildx install reeplaces docker build what does that mean for the arguments that you usually pass to buildx, how they interpreted by docker build or how do you take advantage of the --cache-from --cache-to