wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm --2020-07-06 22:01:10-- https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Resolving dev.mysql.com (dev.mysql.com)... failed: Name or service not known. wget: unable to resolve host address ‘dev.mysql.com’
下載yum鏡像的時候出現wget失靈的情況，
wget默認安裝的
分析是DNS的問題
解決辦法：
vi /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4