附录1. CentOS安装MySQL

卸载MariaDB

• yum remove mariadb
• rpm -qa | grep mariadb
• rpm -e mariadb-libs-5.5.52-1.el7.x86_64 --nodeps
• rm -f /etc/my.cnf
• rm -rf /var/lib/mysql/

安装MySQL

• 复制mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar到虚拟机
  (也可以使用wget直接下载
  https://mirrors.163.com/mysql/Downloads/MySQL-8.0/mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar)
• tar xvf mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar
• rpm -ivh mysql-community-common-8.0.15-1.el7.x86_64.rpm
• rpm -ivh mysql-community-libs-8.0.15-1.el7.x86_64.rpm
• rpm -ivh mysql-community-client-8.0.15-1.el7.x86_64.rpm
• rpm -ivh mysql-community-server-8.0.15-1.el7.x86_64.rpm

启动服务

• mysqld --initialize
• chown mysql:mysql /var/lib/mysql -R
• systemctl start mysqld.service
• systemctl enable mysqld

修改初始root密码

• cat /var/log/mysqld.log | grep password

2019-03-30T13:49:04.059788Z 5 [Note] [MY-010454] [Server] 
A temporary password is generated 
for root@localhost: d_tkTj3l1*:k

• mysql -u root -p

 [root@localhost neusoft]# mysql -u root -p
Enter password: d_tkTj3l1*:k

• 重置密码为root
  ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

远程访问授权

• 进入mysql
• create user 'root'@'%' identified with mysql_native_password by 'root';
• grant all privileges on *.* to 'root'@'%' with grant option;
• flush privileges;

修改加密规则（可以省略）

• ALTER USER 'root'@'localhost' IDENTIFIED BY 'root' PASSWORD EXPIRE NEVER;
• flush privileges;

使用Sqlyog连接

启用日志

• 进入mysql命令行：mysql -u root -p
• 查询日志状态：show variables like 'general_log%';
• 开启日志：set global general_log = 'on';

• 使用tail -f 日志文件，监控日志的变化

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