centos7.9安装MySQL8数据库服务端，客户端

浏览器访问：https://dev.mysql.com/downloads/repo/yum/ 获取yum使用的repo仓库源文件

wget https://dev.mysql.com/get/mysql84-community-release-el7-1.noarch.rpm
rpm -ivh mysql84-community-release-el7-1.noarch.rpm
yum makecache

# 注意：默认直接yum安装是8.x的最新版本：8.4。若是想安装8.0版本的，需要修改repo文件
vim mysql-community.repo

[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/7/$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-innovation-community]
name=MySQL Innovation Release Community Server
baseurl=http://repo.mysql.com/yum/mysql-innovation-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022

[mysql-8.4-lts-community]
name=MySQL 8.4 LTS Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.4-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023

[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/7/$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/7/$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-tools-innovation-community]
name=MySQL Tools Innovation Community
baseurl=http://repo.mysql.com/yum/mysql-tools-innovation-community/el/7/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022

[mysql-tools-8.4-lts-community]
name=MySQL Tools 8.4 LTS Community
baseurl=http://repo.mysql.com/yum/mysql-tools-8.4-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023

[mysql-cluster-8.0-community]
name=MySQL Cluster 8.0 Community
baseurl=http://repo.mysql.com/yum/mysql-cluster-8.0-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-cluster-innovation-community]
name=MySQL Cluster Innovation Release Community
baseurl=http://repo.mysql.com/yum/mysql-cluster-innovation-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022

[mysql-cluster-8.4-lts-community]
name=MySQL Cluster 8.4 LTS Community
baseurl=http://repo.mysql.com/yum/mysql-cluster-8.4-community/el/7/$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023


yum makecache

yum -y install mysql-community-server  # 这个时候安装的版本是8.0.42的

只安装客户端：yum -y install mysql-community-client