CentOS7位安装MySql教程

Posted 2022-11-25 wwtao

1.先检查系统是否装有mysql

rpm -qa | grep mysql

2.下载mysql的repo源

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

 

3.安装 mysql-community-release-el7-5.noarch.rpm包

 

sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm

 

4.安装MySQL

 

sudo yum install mysql-server

 

5.重置MySQL密码

 

mysql -u root

 

如果报错：

 

ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2)

 

原因：原因是/var/lib/mysql的访问权限问题。

 

chown root /var/lib/mysql/

 

重启MySQL服务

 

service mysqld restart

 

接着登陆设置密码

 

mysql -u root

 

use mysql;

 

update user set password=password(‘123456‘) where user=‘root‘;

 

exit;

 

6.重启MySQL服务

 

service mysqld restart

 

接着设置Root账户远程连接密码，账户和密码都是 root

 

 mysql -u root -p

 

GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "root";　

 

重启服务器 

 

service mysqld restart

 

7.使用外网工具连接MySQL

 

连接mysql的用户名和密码都是 root

 

关闭防火墙

 

systemctl stop firewalld.service

 

 

 

 

下面为另一种办法，但是，测试没有成功

连接MySQL服务器，修改密码

 

1）查看初始密码

 

1. [root@host50 ~]#grep –i ‘password‘ /var/log/mysqld.log
2. 2017-04-01T18:10:42.948679Z 1 [Note] A temporary password is generated for root@localhost: mtoa>Av<p6Yk //随机生成的管理密码为mtoa>Av<p6Yk

 

2）使用初始密码连接mysql服务

 

1. [root@host50 ~]# mysql -u root -p‘mtoa>Av<p6Yk‘ //初始密码登录，
2. mysql: [Warning] Using a password on the command line interface can be insecure.
3. Welcome to the MySQL monitor. Commands end with ; or \g.
4. Your MySQL connection id is 11
5. Server version: 5.7.17
7. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
9. Oracle is a registered trademark of Oracle Corporation and/or its
10. affiliates. Other names may be trademarks of their respective
11. owners.
13. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
14. mysql>                                     //登录成功后，进入SQL操作环境

 

3）重置数据库管理员roo本机登录密码

 

1. mysql> show databases;
2. ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement //提示必须修改密码
3. mysql> alter user root@”localhost” identified by "123qqq…A"; //修改登陆密码
4. Query OK, 0 rows affected (0.00 sec)
5. mysql> exit //断开连接
6. [root@host50 ~]#

 

4）修改密码策略

 

1. [root@host50 ~]# mysql -uroot –p123qqq…A
2. mysql>
3. mysql>set global validate_password_policy=0; //只验证长度
4. Query OK, 0 rows affected (0.00 sec)
5. mysql>set global validate_password_length=6； //修改密码长度,默认值是8个字符
6. Query OK, 0 rows affected (0.00 sec)
7. mysql> alter user root@”localhost” identified by "tarena"; //修改登陆密码
8. Query OK, 0 rows affected (0.00 sec)
9. mysql>exit

 

5）使用修改后的密码登录

 

1. [root@host50 ~]# mysql -uroot -ptarena        //登录
2. Welcome to the MySQL monitor. Commands end with ; or \g.
3. Your MySQL connection id is 15
4. Server version: 5.7.17 MySQL Community Server (GPL)
6. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
8. Oracle is a registered trademark of Oracle Corporation and/or its
9. affiliates. Other names may be trademarks of their respective
10. owners.
11. mysql> show databases; //查看数据库
12. +--------------------+
13. | Database |
14. +--------------------+
15. | information_schema |
16. | mysql |
17. | performance_schema |
18. | sys                |
19. +--------------------+
20. 4 rows in set (0.00 sec)
21. mysql>