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                            ## Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

Centos8于2021年年底停止了服務，大家再在使用yum源安裝時候，出現下面錯誤“錯誤：Failed to download metadata for repo ‘AppStream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist”

```
cd /etc/yum.repos.d/
sed -i 's/mirrorlist/#mirrorlist/g'  /etc/yum.repos.d/CentOS-* 
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g'  /etc/yum.repos.d/CentOS-*

wget -O  /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos\-vault\-8.5.2111.repo
yum clean all 
yum makecache
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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