CentOS7的yum源中默认好像是没有mysql的。为了解决这个问题,我们要先下载mysql的repo源。

下载mysql的repo源

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

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

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

安装这个包后,会获得两个mysql的yum repo源:/etc/yum.repos.d/mysql-community.repo,/etc/yum.repos.d/mysql-community-source.repo。

安装mysql

sudo yum install mysql-server

根据步骤安装就可以了,不过安装完成后,没有密码,需要重置密码。

重置密码

重置密码前,首先要登录

mysql -u root

登录时有可能报这样的错:ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2),原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户:

sudo chown -R openscanner:openscanner /var/lib/mysql

然后,重启服务:

service mysqld restart

接下来登录重置密码:

mysql -u root
use mysql;
update user set password=password('123456') where user='root';
exit;

需要更改权限才能实现远程连接MYSQL数据库

可以通过以下方式来确认:

mysql -h localhost -uroot -p
Enter password: ******

Welcome to the MySQL monitor.   Commands end with ; or \g.
Your MySQL connection id is 4 to server version: 4.0.20a-debug
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.

use mysql; (此DB存放MySQL的各种配置信息)

Database changed

select host,user from user; (查看用户的权限情况)

select host, user, password from user;
+-----------+------+-------------------------------------------+
| host       | user | password                                   |
+-----------+------+-------------------------------------------+
| localhost | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |
| 127.0.0.1 | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |
| localhost |       |                                            |
+-----------+------+-------------------------------------------+
4 rows in set (0.01 sec)

由此可以看出,只能以localhost的主机方式访问。
解决方法:

Grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;

(%表示是所有的外部机器,如果指定某一台机,就将%改为相应的机器名;‘root’则是指要使用的用户名,)

flush privileges;    (运行此句才生效,或者重启MySQL)
Query OK, 0 rows affected (0.03 sec)

再次查看。。

select host, user, password from user;
+-----------+------+-------------------------------------------+
| host       | user | password                                   |
+-----------+------+-------------------------------------------+
| localhost | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |
| 127.0.0.1 | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |
| localhost |       |                                            |
| %          | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |
+-----------+------+-------------------------------------------+
4 rows in set (0.01 sec)
Last modification:August 29th, 2020 at 03:26 pm
坚持技术分享,您的支持将鼓励我继续创作!