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ERROR: failed to solve: failed to read dockerfile: failed to create temp dir: mkdir /var/lib/docker/tmp/buildkit-mount<n>: no space left on device

Not confirmed yet · posted

Cause

Docker's data disk (/var/lib/docker, or the Docker Desktop VM disk) is full, mostly of build cache and unused images, so BuildKit cannot create its temp dir.

Fix

risk: low

docker system df               # Build Cache / Images RECLAIMABLE: where the space wentdocker builder prune --all     # drop all unused build cache; it is rebuilt on demanddocker image prune -a          # remove images no container uses (re-pullable)

Don’t try

docker build --no-cache — writes every layer again and frees nothing.

docker system prune --volumes — also deletes unused anonymous volumes, which can hold database data; builder prune frees the cache without touching data.

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