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在安装的Mysql 8+版本后远程连接不上
注意：每次修改后，涉及到权限的一定要刷新权限。
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.04 sec)
mysql>
会报一个错误：
1130 - Host '10.45.12.79' is not allowed to connect to this MySQL server
一、查看Mysql是否开启可以远程访问的权限
1.登录mysql机器
mysql -u root -p
2.切换到Mysql数据库
mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>
3.查看是否运行远程访问
可以看到第一行root 用户的host为localhost，要远程访问，需要将它改成%
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
| localhost | root | caching_sha2_password |
+-----------+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql>
4.将host改为%
mysql> update user set host='%' where user ='root';
Query OK, 1 row affected (0.07 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | root | caching_sha2_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
+-----------+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql>
5.刷新权限
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.10 sec)
mysql>
现在有权限访问了，但是校验方式又有了问题
2059 - Authentication plugin 'caching_sha2_password' cannot be loaded: dlopen(../Frameworks/caching_sha2_password.so, 2): image not found
二、更改连接的密码校验方式
caching_sha2_password加密方式在远程访问时候不支持。
需要改成：mysql_native_password
1.更改连接方式
mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
Query OK, 0 rows affected (0.09 sec)
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | root | mysql_native_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
+-----------+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql>
2.刷新权限
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.04 sec)
mysql>
3.远程连接
OK了
三、创建用户并授权
1.创建用户
Mysql 8 在创建用户上面，有了很大的不同
Mysql 8 之前的创建方式在这里会报错
mysql> GRANT ALL ON *.* TO `wangwei`@`127.0.0.1` IDENTIFIED BY 'passowrd' WITH GRANT OPTION;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIED BY 'passowrd' WITH GRANT OPTION' at line 1
Mysql 8正确的创建方式
mysql> CREATE USER `developer`@`%` IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.08 sec)
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | developer | caching_sha2_password |
| % | root | mysql_native_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
+-----------+------------------+-----------------------+
5 rows in set (0.00 sec)
mysql>
2.授权
mysql> GRANT ALL ON *.* TO `developer`@`%` WITH GRANT OPTION;
Query OK, 0 rows affected (0.09 sec)
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | developer | caching_sha2_password |
| % | root | mysql_native_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
+-----------+------------------+-----------------------+
5 rows in set (0.00 sec)
mysql>
发现用户developer的加密连接方式plugin不对，修改一下
最后一定要刷新权限
mysql> ALTER USER 'developer'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
Query OK, 0 rows affected (0.08 sec)
mysql> select host,user,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | developer | mysql_native_password |
| % | root | mysql_native_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
+-----------+------------------+-----------------------+
5 rows in set (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.04 sec)
mysql>
3.连接
好了，可以愉快的开发了！