Step1：卸载系统自带的mysql

检查 mariadb
rpm -qa | grep mariadb
卸载 mariadb（根据上面所查版本）
rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64

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Step2：下载mysql8安装包

下载地址：https://downloads.mysql.com/archives/community/

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Step3：上传mysql压缩包到 /opt 然后解压

cd /opt
mkdir java
cd java

tar -xvf mysql-8.0.34-1.el7.x86_64.rpm-bundle.tar

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Step4：解压后按照如下顺序安装

rpm -ivh mysql-community-common-8.0.34-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-plugins-8.0.34-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.34-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.34-1.el7.x86_64.rpm
rpm -ivh mysql-community-icu-data-files-8.0.34-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.34-1.el7.x86_64.rpm

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Step5：对mysql进行初始化

mysqld --initialize --console

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Step6：修改mysql安装目录的所有用户和所属组

chown -R mysql:mysql /var/lib/mysql/

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Step7：查看mysql的临时密码

cat /var/log/mysqld.log

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Step8：登录mysql，并修改密码

mysql -uroot -p'这里填在mysqld.log中查看到的临时密码'

systemctl restart mysqld
systemctl status mysqld

alter user 'root'@'localhost' identified by 'wanchen1128';

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完