一 安装mysql 8.0 yum源

cd /etc/yum.repos.d/

curl https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm > centos7.mysql.rpm

yum install centos7.mysql.rpm-y

看到/etc/yum.repo.d目录下生产了以下两个文件：

-rw-r–r-- 1 root root 2108 Apr 25 2019 mysql-community-source.repo

-rw-r–r-- 1 root root 2076 Apr 25 2019 mysql-community.repo

#修改mysql 8.0镜像，关闭强制认证

vi mysql-community.repo

二 yum安装mysql

/*

#查看下列文件的属性，确保没有输出i属性

lsattr /etc/passwd

lsattr /etc/group

lsattr /etc/shadow

lsattr /etc/gshadow