CentOS 7.9安装MySQL

下载Linux版MySQL安装包

• 下载地址https://downloads.mysql.com/archives/community/

下载解压后

安装，按照从上至下顺序，一条一条执行即可安装完毕。

• 进入到rpm所在目录
• rpm -ivh mysql-community-common-8.0.26-1.el7.x86_64.rpm 
• rpm -ivh mysql-community-client-plugins-8.0.26-1.el7.x86_64.rpm
• rpm -ivh mysql-community-libs-8.0.26-1.el7.x86_64.rpm
• rpm -ivh mysql-community-libs-compat-8.0.26-1.el7.x86_64.rpm
• yum install openssl-devel
• rpm -ivh mysql-community-devel-8.0.26-1.el7.x86_64.rpm
• rpm -ivh mysql-community-client-8.0.26-1.el7.x86_64.rpm
• sudo yum install libaio 【这一步看情况，如果在执行下一条时出现报错，可以执行这条，当然，得看你具体报什么错】
• rpm -ivh mysql-community-server-8.0.26-1.el7.x86_64.rpm

启动MySQL服务

• systemctl start mysqld  启动
• systemctl restart mysqld  重启
• systemctl stop mysqld  停止
• systemctl status mysqld 查询状态

查询默认生成的root用户密码

• grep 'temporary password' /var/log/mysqld.log

修改密码策略

• set global validate_password.policy = 0; 设置密码复杂度
• set global validate_password.length = 4; 设置密码长度

修改密码

• alter user 'root'@'localhost' IDENTIFIED BY '1234';

创建一个可远程访问到用户，0.0.0.0

• create user  'root'@'%' IDENTIFIED WITH mysql_native_password BY '1234';

修改root用户的权限

• GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;

• FLUSH PRIVILEGES;

设置只读权限

• GRANT SELECT ON *.* TO 'your_username'@'your_host';
• FLUSH PRIVILEGES;