Linux学习笔记——CentOS7.3搭建mysql8

参考文档：CentOS7.3下安装MySql5.7

1. 从MySQL官网找到yum源
   MySQL官网
   
   yum源：mysql80-community-release-el7-3.noarch.rpm

2. 下载yum源
   命令：wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
   /get/后面为找到的yum源
   

3. 安装yum源
   命令：yum localinstall mysql80-community-release-el7-3.noarch.rpm
   
   安装完成后如下
   
   检测yum源是否安装成功
   命令：yum repolist enabled | grep “mysql.*-community.*”
   

4. 安装mysql
   命令：yum install mysql-community-server
   
   安装完成后如下
   

5. 相关命令
   启动mysql：systemctl start mysqld
   关闭mysql：systemctl stop mysqld
   重启mysql：systemctl restart mysqld
   查看mysql状态：systemctl status mysqld
   设置mysql随系统启动而启动：systemctl enable mysqld
   关闭mysql随系统启动而启动：systemctl disable mysqld

6. 查看mysql下root账号的默认密码
   命令：grep ‘temporary password’ /var/log/mysqld.log
   

7. mysql配置文件路径
   配置文件：/etc/my.cnf
   日志文件：/var/log//var/log/mysqld.log
   服务启动脚本：/usr/lib/systemd/system/mysqld.service
   socket文件：/var/run/mysqld/mysqld.pid

8. 查看密码策略
   命令：show variables like ‘%password%’;
   修改密码策略：set global validate_password.policy=0;(0或LOW代表低级)

9. 查看字符编码
   命令： show variables like ‘%character%’;