centOS7.9安装mysql5.7

1.wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

2.rpm -ivh mysql80-community-release-el8-4.noarch.rpm

3.# 解决公钥未安装错误,由于版本时间比较长了，不执行这条命令校验不通过

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

4.yum update

5.yum install mysql-server

6.设置 文件夹权限 解决报错： The innodb_system data file 'ibdata1' must be writable

chmod -R 777 /var/lib/mysql

7.初始化 MySQL

mysqld --initialize

8.启动

systemctl start mysqld

9.查看默认密码

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

显示 [Note] A temporary password is generated for root@localhost: lA*h?a(e9lTi

10.初次登录修改密码 先登录

mysql -u root -p

ALTER USER USER() IDENTIFIED BY '123456';

flush privileges;

11.#允许其他机器连接 先登录

mysql -u root -p

update user set Host='%' where User='root';

flush privileges;