graphvizはスクリプトでグラフを作成できるツール
wget http://www.graphviz.org/graphviz-rhel.repo sudo cp ./graphviz-rhel.repo /etc/yum.repos.d/ sudo yum list available 'graphviz*' sudo yum install 'graphviz*'
参考
http://www.graphviz.org/content/problem-yum-install-graphviz-redhat-7
http://www.graphviz.org/Download_linux_rhel.php
https://qiita.com/ynaito/items/efc2dc2085482dfceac5