时间：2021-07-01 10:21:17 帮助过：23人阅读
2、安装mysql
yum install mysql-community-server
3、MySQL服务器初始化（从MySQL 5.7开始）：在服务器初始启动时，如果服务器的数据目录为空，则会发生以下情况：
服务器已初始化。
在数据目录中生成SSL证书和密钥文件。
该validate_password插件安装并启用。
将‘root‘@‘localhost‘ 创建一个超级用户帐户。设置超级用户的密码并将其存储在错误日志文件中。要显示它，请使用以下命令：
shell> sudo grep ‘temporary password‘ /var/log/mysqld.log通过使用生成的临时密码登录并为超级用户帐户设置自定义密码，尽快更改root密码：
shell> mysql -uroot -pmysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘MyNewPass4!‘;MySQL的 validate_password 插件默认安装。这将要求密码包含至少一个大写字母，一个小写字母，一个数字和一个特殊字符，并且密码总长度至少为8个字符。
这个其实与validate_password_policy的值有关, mysql8.0更改了validate_password_policy相关的配置名称, 这跟Mysql5.7有点不一样了.
mysql> set global validate_password.policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password.length=1;
Query OK, 0 rows affected (0.00 sec)
接着再修改密码
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘123456‘;
Query OK, 0 rows affected (0.05 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)
5. Mysql8.0要注意的点
1) 创建用户和授权
在mysql8.0创建用户和授权和之前不太一样了，mysql8.0需要先创建用户和设置密码,然后才能授权。
mysql> create user ‘kevin‘@‘%‘ identified by ‘123456‘;
Query OK, 0 rows affected (0.04 sec)
mysql> grant all privileges on *.* to ‘kevin‘@‘%‘ with grant option;
Query OK, 0 rows affected (0.04 sec)
mysql> create user ‘bobo‘@‘%‘ identified by ‘123456‘;
Query OK, 0 rows affected (0.06 sec)
mysql> grant all privileges on *.* to ‘kevin‘@‘%‘;
Query OK, 0 rows affected (0.03 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.04 sec)
mysql> select host,user,authentication_string from mysql.user;
+-----------+------------------+------------------------------------------------------------------------+
| host | user | authentication_string |
+-----------+------------------+------------------------------------------------------------------------+
| % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 |
| % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 |
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 |
+-----------+------------------+------------------------------------------------------------------------+
如果还是用Mysql5.7及之前版本的直接授权的方法, 会有报错:
mysql> grant all privileges on *.* to ‘shibo‘@‘%‘ identified by ‘123456‘;
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 ‘123456‘‘ at line 1
2) Mysql8.0默认是不能使用root账号进行远程登录的! root账号只能本地登录!
mysql> select host,user,authentication_string from mysql.user;
+-----------+------------------+------------------------------------------------------------------------+
| host | user | authentication_string |
+-----------+------------------+------------------------------------------------------------------------+
| % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 |
| % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 |
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 |
+-----------+------------------+------------------------------------------------------------------------+
6 rows in set (0.00 sec)
如果想要远程登录, 则需要进行update更新下root账号的权限
mysql> update mysql.user set host=‘%‘ where user="root";
Query OK, 1 row affected (0.10 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.14 sec)
mysql> select host,user,authentication_string from mysql.user;
+-----------+------------------+------------------------------------------------------------------------+
| host | user | authentication_string |
+-----------+------------------+------------------------------------------------------------------------+
| % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 |
| % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 |
| % | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 |
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
+-----------+------------------+------------------------------------------------------------------------+
6 rows in set (0.00 sec)
这样就能在远程使用root账号登录该mysql8.0的数据库了
3) 修改root账号权限, 允许root账号远程登录后, 在其他主机进行mysql的远程连接时，出现了弹窗报错：
ERROR 2059 (HY000): Authentication plugin ‘caching_sha2_password‘ cannot be loaded: /usr/lib64/mysql/plugin/caching_sha2_password.so: cannot open shared object file: No such file or directory
出现这个原因是mysql8 之前的版本中加密规则是mysql_native_password, 而在mysql8之后,加密规则是caching_sha2_password, 解决问题方法有两种:
1) 一种是升级navicat驱动;
2) 一种是把mysql用户登录密码加密规则还原成mysql_native_password;
这里选择第二种方法来解决:
#修改加密规则
mysql> ALTER USER ‘root‘@‘%‘ IDENTIFIED BY ‘123456‘ PASSWORD EXPIRE NEVER;
Query OK, 0 rows affected (0.16 sec)
#更新一下用户的密码
mysql> ALTER USER ‘root‘@‘%‘ IDENTIFIED WITH mysql_native_password BY ‘123456‘;
Query OK, 0 rows affected (0.08 sec)
#刷新权限
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.03 sec)
完毕！
centos7安装mysql8.0
标签：更改root密码 安装库 plugin 报错 大写 sha 默认 日志 不能