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Switch to CentOS 7 as the Docker base image. It's more stable and updated less frequently than Fedora. As a bonus, it's Thrift package doesn't pull the world as a dependency which reduces image size from 700 MB to 380 MB. Suggested by Avi. Message-Id: <1451911969-26647-1-git-send-email-penberg@scylladb.com>