linux安装mysql57-community版本

1.下载包：

rpm -Uvh http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

2.安装：

yum install mysql-community-server -y

3.启动mysql

 systemctl start mysqld.service

4.加入开机启动

 systemctl enable mysqld

5.修改配置文件：
修改密码策略为低级

#添加validate_password_policy配置 0(low）,1(medium),2(strong)
validate_password_policy=0
# 关闭密码策略
validate_password = off
character_set_server=utf8
init_connect