win10上安裝的centos7虛擬機 在虛擬機yum安裝及yum update命令中 都報錯 無法連接，嘗試其他鏡像等。
網上幾篇文章都是複製的一樣的關centos防火牆的兩個命令
systemctl disable firewalld
systemctl stop firewalld
關閉後依然打不開
嘗試把win10的網絡防火牆關閉
把yum源由阿里雲的換成163的源
更改dns地址爲114
問題依舊
嘗試了一下curl其中一個報錯鏈接
curl http://mirrors.163.com/centos/7/updates/x86_64/repodata/ac18ef657fb4af51024b7006392ea967d09aeb9c05c13d0f18492f2fc11e77c3-primary.sqlite.bz2
報404 找不到
將http改爲https後 成功了
於是將yum源中的http都改爲https
vim /etc/yum.repos.d/CentOS-Base.repo
[base]
name=CentOS-$releasever - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=https://mirrors.163.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=https://mirrors.163.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=https://mirrors.163.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - 163.com
baseurl=https://mirrors.163.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
~
再執行
yum makecache
yum update
問題解決