MYSQL ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.10.210' (111) 解决方法

今天在测试MySQL的连接时候,发现连接不通过,并报错ERROR 2003 (HY000): Can't connect to mysql server on '192.168.10.210' (111) 
测试代码:

require 'mysql2'
client = Mysql2::Client.new(:host=>"192.168.10.210",:username=>'root',:password=>"root")
puts results = client.query("show databases;")

谷歌了一下之后,原来是在mysql的my.cnf中有下面一段代码:

# 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 #这里默认监听本地localhost

如果要让mysql监听到其他的地址,可以将bind-address = 127.0.0.1注释掉。 
或者将bind-address = 0.0.0.0监听所有的地址

屏蔽掉之后再次运行代码又出现:Host '192.168.10.83' is not allowed to connect to this MySQL server 
MYSQL ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.10.210' (111) 解决方法 
解决方法: 
如果想让192.168.10.83能够连接到本地的这个数据库,要让数据库给其分配权限,登录mysql,执行:(username 和 password是登录mysql的用户名和密码)

GRANT ALL PRIVILEGES ON *.* TO 'username'@'192.168.10.83' IDENTIFIED BY 'password' WITH GRANT OPTION;

如果要想所有的外部ip地址都能够访问使用mysql,可以执行下面:

GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;

之后执行刷新数据库:

flush privileges;

如果要查看用户的权限,可以执行:

> show grants for 'root'@192.168.10.83

MYSQL ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.10.210' (111) 解决方法

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