Make sure we call "dnf clean all" to remove the DNF cache, which reduces Docker image size as per the following guidelines: https://github.com/fedora-cloud/Fedora-Dockerfiles/wiki/Guidelines-for-Creating-Dockerfiles A freshly built image is 250 MB smaller than the one on Docker Hub: <none> <none> b8cafc8ff557 16 seconds ago 1.2 GB docker.io/scylladb/scylla-toolchain fedora-29-20190212 d253d45a964c 3 days ago 1.45 GB Message-Id: <20190215142322.12466-1-penberg@scylladb.com>