If you want to install docker on Cent OS 7, don't use the binaries out of the extras repo from centos.

What you get is a different named docker daemon binary, with /usr/bin/dockerd-current instead of /usr/bin/dockerd and also /usr/bin/docker-proxy is missing.

Follow the instructions on: https://docs.docker.com/engine/installation/linux/centos/

In short what i did was:

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