Install Docker Engine on CentOS
https://docs.docker.com/engine/install/centos/
proxy環境下でCentOS7にdockerを構築するときのメモ
https://qiita.com/KuwaK/items/a33c625d1472b0ab2e16
How to stop docker under Linux
https://stackoverflow.com/questions/42365336/how-to-stop-docker-under-linux
