I’m banging my head for a while now on why my multi-host layer caching scheme isn’t working as expected.
Is there some in-depth explanation into what determines the caching key/hash of a COPY layer?
I’m not sure, but it seems to include the following:
- docker server version
- whether buildkit is on or not
- the order of the files in the directory
- file permissions? (https://github.com/moby/moby/issues/32816)
- mtime?
Beyond docker history - is there a better way to troubleshoot mysterious cache-invalidations?
I’ve recently encountered buildx - is that the answer? it seems like it would require major changes to our CI…