Docker build failure
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Docker build failure
Docker manages its own storage area, and that space can fill up even if the host filesystem still has room.
Old images, stopped containers, and unused build cache accumulate quietly over time, especially on CI machines. When Docker’s storage directory fills up, builds fail even though
df -hlooks fine at first glance.This catches people off guard because the error doesn’t point to Docker storage directly.
Takeaway: Docker disk usage needs its own cleanup and monitoring, separate from the host.