centos7下使用yum安装mysql

centos7下使用yum安装mysql

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。

1. 下载mysql的repo源

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

2. 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。

3. 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。

4. 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

假如出现

chown: invalid user: ‘openscanner:openscanner’

那就用

 # chown root /var/lib/mysql/

然后,重启服务:

$ service mysqld restart

接下来登录重置密码:

$ mysql -u root

mysql > use mysql;mysql > update user set password=password(‘123456‘) where user=‘root‘;mysql > exit;

5. 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:

root#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.

mysql> use mysql; (此DB存放MySQL的各种配置信息)

Database changed

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

mysql> 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:

mysql> 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,)

mysql> 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。。

mysql> 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)

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