ubuntu18.04 安装mysql server

 mysql 5.7支持的最高版本是Ubuntu17 ，即便安装成功后，也会出现各类妖蛾子，本人就被这种问题困扰了好一会。在Ubuntu 18.04下安装mysql，建议安装8.0以上版本！

1. 配置apt source

下载mysql-apt-config_0.8.11-1_all.deb

sudo dpkg -i mysql-apt-config_0.8.11-1_all.deb

 

2. 更新apt source

sudo apt-get update

3. 安装mysql 8

sudo apt-get install mysql-server

注意在安装过程当中，加密方式一块选择传统加密方式

4. 配置远程访问权限

mysql -u root -proot mysql #登录mysql，默认选中mysql数据库

查看root用户的权限：

mysql> select host, user, authentication_string, plugin from user; +-----------+------------------+------------------------------------------------------------------------+-----------------------+
| host      | user             | authentication_string                                                  | plugin                |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.session    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.sys        | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | root             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B                              | mysql_native_password |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
4 rows in set (0.00 sec) mysql> show variables like '%skip_networking%'; +-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.01 sec)

能够看到 root 用户的 host，默认应该显示的 localhost，只支持本地访问，不容许远程访问。

受权root用户远程访问权限:

mysql> CREATE USER 'root'@'%' IDENTIFIED BY 'root'; Query OK, 0 rows affected (0.09 sec) mysql> select host, user, authentication_string, plugin from user; +-----------+------------------+------------------------------------------------------------------------+-----------------------+
| host      | user             | authentication_string                                                  | plugin                |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
| %         | root             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B                              | mysql_native_password |
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.session    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.sys        | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | root             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B                              | mysql_native_password |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
5 rows in set (0.00 sec) mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'root'; Query OK, 0 rows affected (0.06 sec) mysql> select host, user, authentication_string, plugin from user; +-----------+------------------+------------------------------------------------------------------------+-----------------------+
| host      | user             | authentication_string                                                  | plugin                |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
| %         | root             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B                              | mysql_native_password |
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.session    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | mysql.sys        | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password |
| localhost | root             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B                              | mysql_native_password |
+-----------+------------------+------------------------------------------------------------------------+-----------------------+
5 rows in set (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.01 sec)

 从别的机器使用mysql客户端链接，应该是成功了。

 

5. 其余设置（可选）

ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER; #修改加密规则，password为当前密码 ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'password'; #更新 root 用户密码，password为当前密码 FLUSH PRIVILEGES; #刷新权限

 

6. 若是遇到SQLException : SQL state: 42000 com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user 'root'@'%' to database 'ranger' ErrorCode: 1044 这种错误

应该是看到受权的权限没有打开： Grant_priv is set to N for root@%. 修复下

UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='root'; 
FLUSH PRIVILEGES;