Where is the buildKit default cache directory?

[gitfxx]

I use BuildKit in K8s pod to build image, Now this is how I use it: But when multiple pods run buildkit at the same time, the other tasks will fail because the same buildKitdlock is used; which is the default cache directory for buildKit?

[tonistiigi]

you can only have one active buildkitd daemon per state/storage directory

[gitfxx]

@tonistiigi I just want to use cache to speed up building the image, which directory should I mount when running in pod？

I used export-cache(type=local),but it didn't seem to speed up the build

[AkihiroSuda]

You have to create separate dirs per pod. Or just mount emptyDir vol.