Redhat7.5 （純淨OS，未安裝任何tools）
一、rpm 安裝
MySQL下載地址： https://dev.mysql.com/downloads/mysql/8.0.html
[root@localhost tools]# mysql -V
mysql Ver 15.1 Distrib 5.5.56-MariaDB, for Linux (x86_64) using readline 5.1
[root@localhost tools]# rpm -qa|grep mysql
akonadi-mysql-1.9.2-4.el7.x86_64
qt-mysql-4.8.7-2.el7.x86_64
[root@localhost tools]# rpm -e akonadi-mysql
[root@localhost tools]# rpm -e qt-mysql
[root@localhost tools]# rpm -qa|grep mysql
[root@localhost tools]# mysql -V
mysql Ver 15.1 Distrib 5.5.56-MariaDB, for Linux (x86_64) using readline 5.1
[root@localhost tools]# whereis mysql
mysql: /usr/bin/mysql /usr/lib64/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz
[root@localhost tools]# rm -rf mysql: /usr/bin/mysql /usr/lib64/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz
[root@localhost tools]# whereis mysql
[root@localhost mysql]# tar -xvf mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar
[root@localhost mysql]# rpm -ivh mysql-community-client-8.0.16-2.el7.x86_64.rpm
warning: mysql-community-client-8.0.16-2.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
mysql-community-libs(x86-64) >= 8.0.11 is needed by mysql-community-client-8.0.16-2.el7.x86_64
[root@localhost mysql]# rpm -ivh mysql-community-server-8.0.16-2.el7.x86_64.rpm
warning: mysql-community-server-8.0.16-2.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
mysql-community-client(x86-64) >= 8.0.11 is needed by mysql-community-server-8.0.16-2.el7.x86_64
解決：清除yum裏所有mysql依賴包
[root@localhost mysql]# rpm -qa|grep mysql
[root@localhost mysql]# yum remove mysql-libs
[root@localhost mysql]# ls
mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar
mysql-community-client-8.0.16-2.el7.x86_64.rpm
mysql-community-common-8.0.16-2.el7.x86_64.rpm
mysql-community-devel-8.0.16-2.el7.x86_64.rpm
mysql-community-embedded-compat-8.0.16-2.el7.x86_64.rpm
mysql-community-libs-8.0.16-2.el7.x86_64.rpm
mysql-community-libs-compat-8.0.16-2.el7.x86_64.rpm
mysql-community-server-8.0.16-2.el7.x86_64.rpm
mysql-community-test-8.0.16-2.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-common-8.0.16-2.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-libs-8.0.16-2.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-client-8.0.16-2.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-server-8.0.16-2.el7.x86_64.rpm
[root@localhost mysql]# mysql -V
mysql Ver 8.0.16 for Linux on x86_64 (MySQL Community Server - GPL)
[root@localhost mysql]#
[root@localhost mysql]# ps -ef|grep mysqld
root 73249 13933 0 19:31 pts/1 00:00:00 grep --color=auto mysqld
[root@localhost mysql]# systemctl start mysqld.service
[root@localhost mysql]# ps -ef|grep mysqld
mysql 73370 1 37 19:32 ? 00:00:00 /usr/sbin/mysqld
root 73414 13933 0 19:32 pts/1 00:00:00 grep --color=auto mysqld
參考：https://blog.csdn.net/u014236541/article/details/78124215
二、yum安裝
yum源配置參考：https://blog.csdn.net/weixin_40343504/article/details/82221159
1.下載mysql的repo源
下載地址：https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
2.安裝mysql repo rpm
[root@localhost Desktop]# rpm -ivh mysql80-community-release-el7-1.noarch.rpm
安裝後，會獲得兩個mysql的yum repo源：/etc/yum.repos.d/mysql-community.repo，/etc/yum.repos.d/mysql-community-source.repo。
3.安裝mysql
[root@localhost Desktop]# yum install mysql-server
根據提示安裝就可以了