【MySQL】Navicat无法远程连接MySQL一系列问题解决方案
最近遇到了一件非常棘手的问题，使用yum安装mariadb-server，正在执行mysql——secure_installation出现报错，并且Navicat远程连接数据库连接不到，网上查阅了一下原因，于是整理出这篇Navicat无法远程连接MySQL一系列问题解决方案。
错误1：ERROR 2002
报错信息：
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
解决方案：
其实只是因为太粗心，没有启动MySQL,输入systemctl start mariadb即可。
错误2：ERROR 1130
报错信息：
1130 - Host 'xxx' is not allowed to connect to this MariaDB server
解决方案：
(1) 查看本地登录
MariaDB [(none)]> show grants for root;
ERROR 1141 (42000): There is no such grant defined for user 'root' on host '%'
MariaDB [(none)]> select user,host from mysql.user;
+------+-----------+
| user | host |
+------+-----------+
| root | 127.0.0.1 |
| root | ::1 |
| root | localhost |
+------+-----------+
3 rows in set (0.00 sec)
(2) 是没有践行授权到所有网络，进行授权就可以远程连接了，输入IP、端口以及密码点击连接。
MariaDB [(none)]> grant all on *.* to root@'%';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show grants for root;
+-------------------------------------------+
| Grants for root@% |
+-------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' |
+-------------------------------------------+
1 row in set (0.00 sec)
MariaDB [(none)]> select user,host from mysql.user;
+------+-----------+
| user | host |
+------+-----------+
| root | % |
| root | 127.0.0.1 |
| root | ::1 |
| root | localhost |
+------+-----------+
4 rows in set (0.00 sec)
错误3：ERROR 1045
报错信息：
1045 - Access denied for user 'root'@'192.168.52.1'(using password:YES)
解决方案：
上面的授权是不需要密码，去掉密码，即可登录成功。
但是，不要密码可能不保险，最好增加密码，然后重新授权
MariaDB [(none)]> grant all on *.* to root@'%' identified by "123456";
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show grants for root;
+--------------------------------------------------------------------------------------------------------------+
| Grants for root@% |
+--------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+--------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)