How to force Docker for a clean build of an image
In some extreme cases, your only way around recurring build failures is by running:
docker system pruneThe command will ask you for your confirmation:
WARNING! This will remove: - all stopped containers - all volumes not used by at least one container - all networks not used by at least one container - all images without at least one container associated to themAre you sure you want to continue? [y/N]This is of course not a direct answer to the question, but might save some lives... It did save mine.
The command docker build --no-cache . solved our similar problem.
Our Dockerfile was:
RUN apt-get updateRUN apt-get -y install php5-fpmBut should have been:
RUN apt-get update && apt-get -y install php5-fpmTo prevent caching the update and install separately.