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[mysqld]
bind-address=0.0.0.0

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mysql -u root -p
mysql> use mysql;
mysql> select user,host from user;

mysql> update user set host='%' where user='root';
mysql> flush privileges;

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql> flush privileges;