Mariadb 无法远程连接

环境

mariadb Ver 15.1 Distrib 10.1.38-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

Ubuntu 18.04.2

问题

mysql -h 192.168.0.5 -u root -p

报错如下：

ERROR 2003 (HY000): Can’t connect to MySQL server on ‘192.168.0.4’ (111 “Connection refused”)

解决方法

参考官方解释（真香）
https://mariadb.com/kb/en/library/configuring-mariadb-for-remote-client-access/

1. 把/etc/mysql/mariadb.conf.d/50-server.cnf 下面的bind-address 注释掉，如下所示：

# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address           = 127.0.0.1

2. 权限写入数据库

进入mysql命令行

GRANT ALL PRIVILEGES ON *.* TO 'USER_NAME'@'%' IDENTIFIED BY 'PASSWORD' WITH GRANT OPTION;

USER_NAME, PASSWORD按照自己需求写。
一定要让USER_NAME拥有全部权限，仅仅是一个数据表是不够的，然后刷新权限表。
FLUSH PRIVILEGES;

4. 重启服务
   一定要重启mysql\mysql\mariadb

service mysql restart
service mariadb restart
service mysqld restart

5. 愉快玩耍

python测试mariadb是否连接的脚本

import pymysql

conn = pymysql.Connect(host='192.168.0.2',user='keystone',passwd='keystone1001',db='keystone')
cur = conn.cursor()
cur.execute("select version()")
for i in cur:
    print(i)
cur.close()