ERROR 2003 (HY000): Can't connect to MySQL server on "host" (111)

默認情況下Mysql只允許本地登錄，所以需要修改配置文件將地址綁定給註釋掉：

vim /etc/mysql/my.cnf

# Instead of skip-networking the default is now to listen onlyon
# localhost which is more compatible and is not less secure.
#bind-address 
         = 127.0.0.1 <---註釋掉這一行就可以遠程登錄了