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 '123456' WITH GRANT OPTION;
flush privileges;

 然后重新执行etup.sh 就正常了。