安装MySQL

在Linux环境下安装MySQL - 使用包管理工具（Redhat、CentOS）

1. yum install / yum erase / yum update / yum info
   安装：yum install -y mariadb mariadb-server
   查看：yum list installed | grep mariadb
   卸载：yum erase -y mariadb mariadb-server mariadb-libs
2. rpm -ivh / rpm -e / rpm -qa
   下载：wget / tar -xvf
   补包：yum install -y libaio
   安装：
   rpm -ivh mysql-community-common-5.7.26-1.el7.x86_64.rpm
   rpm -ivh mysql-community-libs-5.7.26-1.el7.x86_64.rpm
   rpm -ivh mysql-community-client-5.7.26-1.el7.x86_64.rpm
   rpm -ivh mysql-community-server-5.7.26-1.el7.x86_64.rpm

启动/停止/重启MySQL服务器
systemctl start mysqld / service mysqld start
systemctl stop mysqld / service mysqld stop
systemctl restart mysqld
systemctl status mysqld
systemctl enable mysqld

netstat -ntlp | grep mysql
cat /var/log/mysqld.log | grep "A temporary password"

通过MySQL客户端工具连接服务器
mysql -u root -p

准备工作
set global validate_password_policy=0;
set global validate_password_length=6;
alter user 'root'@'localhost' identified by '123456';