reference:
https://www.sysit.cn/blog/post/sysit/CDH6.2.0%E7%B3%BB%E7%BB%9F%E9%83%A8%E7%BD%B2%E6%89%8B%E5%86%8C
https://www.cnblogs.com/yinzhengjie/articles/11029566.html
https://www.cloudera.com/documentation/enterprise/6/6.2/topics/install_cm_cdh.html