问题一

Duplicate entry '%-root' for key 'PRIMARY'

select user,host from user;
查看是否已经有 host为’%'的root用户

#刷新mysql
flush privileges;
#删除掉host为localhost的用户
delete from user where user = ‘root’ and host = ‘localhost’;
#再次刷新，重启mysql即可
flush privileges;