mysql> use mysql; 
mysql> select host,user form user; 
mysql>update user set host = '%' where user ='root'; 
mysql>select host,user from user; 
mysql> flush privileges; 
mysql> quit; 

root@3bc476b7e0d5:~# vim /etc/mysql/mysql.conf.d/mysqld.cnf 
root@3bc476b7e0d5:~# netstat -an | grep 3306 
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 

root@3bc476b7e0d5:/# service mysql enable 
Usage: /etc/init.d/mysql start|stop|restart|reload|force-reload|status 
root@3bc476b7e0d5:/# netstat -an | grep 3306 
tcp6 0 0 :::3306 :::* LISTEN 
root@3bc476b7e0d5:/# mysql --version 
mysql Ver 14.14 Distrib 5.7.16, for Linux (x86_64) using EditLine wrapper 
root@3bc476b7e0d5:/# mysql -u root -p 
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g. 
Your MySQL connection id is 4 
Server version: 5.7.16-0ubuntu0.16.04.1 (Ubuntu) 
 
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. 
 
Oracle is a registered trademark of Oracle Corporation and/or its 
affiliates. Other names may be trademarks of their respective 
owners. 
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. 
 
mysql> show databases; 
+--------------------+ 
| Database | 
+--------------------+ 
| information_schema | 
| fabric | 
| mysql | 
| performance_schema | 
| sys | 
+--------------------+ 
5 rows in set (0.02 sec)