centos7下搭建LNMP之MySQL

MySQL版本：5.7

1、进入home目录：cd /home

2、下载MySQL源安装包：wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

3、安装MySQL源：yum localinstall mysql57-community-release-el7-8.noarch.rpm

4、检测MySQL源是否安装成功：yum repolist enabled| grep "mysql.*-community.*"

5、安装MySQL：yum install mysql-community-server

6、启动MySQL：systemctl start mysqld 或 service mysqld start

7、检查MySQL启动状态：systemctl status mysqld

8、开机启动：

systemctl enable mysqld

 systemctl daemon-reload

9、修改root默认密码：grep 'temporary password' /var/log/mysqld.log

这时他会给你返回一个默认密码：A temporary password is generated for root@localhost: OkS&Kkn+w6qm

登录MySQL：mysql -u root -p

修改密码：ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

或者：set password for 'root'@'localhost' =password('你的密码');

通过msyql环境变量可以查看密码策略的相关信息：show variables like '%password%';

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拓展：下面的操作主要用于navcat外网远程连接上mysql

使用MySQL：use mysql;

flush privileges;

把localhost这条记录的host改为 %； 意思是root可以由任何主机登录mysql，网上很多写法，都没有and host='localhost'这个条件，经常报错：update user set host = '%' where user =  'root'  and  host= 'localhost';

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退出MySQL：quit;

10、重启：systemctl restart mysqld 或 service mysqld restart