ERROR 1396 (HY000): Operation CREATE USER failed for 'root'@'localhost'

安装ranger时MySQL报错，查看MySQL数据库，发现host=localhost这一列被删除了，插入这一列就好了，具体操作如下：

解决办法：

进入MySQL数据库

 use mysql:
 insert into user(Host,User,Password) values("localhost","%",password("123456"))
 GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY '' WITH GRANT OPTION;
 flush privileges;

然后重新执行etup.sh 就正常了。