崔春辉

Linux CentOS7.4 安装148.163.172.1美国大带宽主机配置MySQL5.7

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崔春辉

1、下载mysql源安装包:

# wget http://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm
2、安装mysql源

# rpm -Uvh mysql57-community-release-el7-10.noarch.rpm

3、安装mysql服务端

# yum install  -y  mysql-community-server

若结尾出现Complete!， 则MySQL安装完成。

4、启动mysql服务

# systemctl restart mysqld

5、检查mysql 的运行状态

# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
# systemctl status mysqld.service

6、查看MySQL初始密码：

Mysql5.7默认安装之后root是有密码的。

Mysql5.7默认安装之后root是有密码的。为了加强安全性，MySQL5.7为root用户随机生成了一个密码，在error log中，关于error log的位置，如果安装的是RPM包，则默认是/var/log/mysqld.log。
只有启动过一次mysql才可以查看临时密码

# grep 'A temporary password' /var/log/mysqld.log

     2018-12-27T05:12:55.432374Z 1 [Note] A temporary password is generated for root@localhost: IxQuipv>4j=m

IxQuipv>4j=m 这个就是默认的密码。

7、更改MySQL密码：

# mysqladmin -u root -p'旧密码' password '新密码'

如果因为密码太过简单的原因，导致更改失败。有两个接解决方法：

方法一：把密码设置复杂点（这是最直接的方法）

方法二：关闭mysql密码强度验证(validate_password)

　　　　　　　　编辑配置文件：vim /etc/my.cnf， 增加这么一行validate_password=off

　　　　　　　　编辑后重启mysql服务：systemctl restart mysqld

方法三：直接跳过更改密码，重置mysql密码（进入mysql）

        使用默认的密码登陆

             #mysql -uroot -p
            Enter password: 输入默认密码
            ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) -->出现这个错误就需要重置密码。

           

<1>.重置密码的第一步就是跳过MySQL的密码认证过程，方法如下：

#vim /etc/my.cnf