centos下yum方式安装mysql5.7,Error: GPG check FAILED与Unable to find a match: mysql-community-server

环境：

系统：centos8

软件：mysql 5.7

安装方式：yum安装

1、配置mysql 5.7的yum源

wget http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql57-community-release-el7-10.noarch.rpm

然后查看一下是否配置上：

yum repolist 查看已配置的yum源

[root@python01 ~]# yum repolist 
repo id                                                                             repo name
AppStream                                                                           CentOS-8-stream - AppStream - mirrors.aliyun.com
base                                                                                CentOS-8-stream - Base - mirrors.aliyun.com
extras                                                                              CentOS-8-stream - Extras - mirrors.aliyun.com
mysql-connectors-community                                                          MySQL Connectors Community
mysql-tools-community                                                               MySQL Tools Community
mysql57-community                                                                   MySQL 5.7 Community Server

2.1、yum安装mysql

yum -y install mysql-community-server

报错1：

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

先关闭一下mysql模块，再继续执行yum install安装：

yum module disable mysql

报错2：

这是gpg验证不通过的原因，因为我是在centos8系统上安装mysql57-community-release-el7-10.noarch.rpm，即el7本身应该在centos7上安装的，但是5.7没有el8的包，如果安装mysql80-community-release-el8-4.noarch.rpm，就没有这个问题;

mysql 8.0 release下载地址：​​https://dev.mysql.com/downloads/repo/yum/​​

Error: GPG check FAILED

跳过gpg验证即可：

yum -y install mysql-community-server --nogpgcheck

2.2、启动mysql:

[root@python01 ~]# systemctl start mysqld.service 
[root@python01 ~]# ps -ef|grep mysql              
mysql     336231       1 17 13:30 ?        00:00:00 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

2.3、查看root默认密码并登录：

grep "password" /var/log/mysqld.log
mysql -uroot -p

2.4、修改密码：

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';