阿里云服务 CentOS8.2 安装 MySQL5.7 （亲测稳定）

1、检查Centos版本

cat /etc/redhat-release

2、检查是否安装过MySQL

systemctl status mysqld.service

出现Unit mysqld.service could not be found. 表示没有安装

3、下载MySQL官方的Yum Repository

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

4、安装Yum Repository

yum -y install mysql57-community-release-el7-10.noarch.rpm

5、安装mysql

yum -y install mysql-community-server

出现以上错误，All matches were filtered out by modular filtering for argument: mysql-community-server

Error: Unable to find a match: mysql-community-server

解决办法：先执行 yum module disable mysql，然后再执行yum -y install mysql-community-server

6、卸载Yum Repository
由于每次 yum 操作都会自动更新，需要把这个卸载掉

yum -y remove mysql57-community-release-el7-10.noarch

7、查看MySQL状态

systemctl status mysqld.service

8、启动myql

systemctl start mysqld.service

9、查看mysql 临时密码

grep "password" /var/log/mysqld.log

临时密码是：iIn>yP=iE1&q

mysql -uroot –p

Enter password:iIn>yP=iE1&q

登录成功后：密码必须包含大小写字母、数字和特殊字符，不然修改密码失败

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MySQL%57';

10、开启MySQL远程访问
执行以下命令开启远程访问限制（注意：下面命令开启的是%代表所有用户，如要开启某一个IP，用IP代替%）

mysql> grant all privileges on *.* to 'root'@'%' identified by 'MySQL%57' with grant option;

11、执行刷新命令

mysql> flush privileges;

12、在防火墙中添加3306端口

firewall-cmd --zone=public --add-port=3306/tcp –permanent

刷新防火墙

firewall-cmd --reload  

阿里云服务器安全组开启3306端口