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                            [TOC]

### 一、更換源
```
阿里云yum源：
1）備份當前yum源防止出現意外還可以還原回來
cd /etc/yum.repos.d/
cp CentOS-Base.repo CentOS-Base-repo.bak
2）使用wget下載阿里yum源repo文件
wget http://mirrors.aliyun.com/repo/Centos-7.repo
3) 清理舊包
yum clean all
4）把下載下來阿里云repo文件設置成為默認源
mv Centos-7.repo CentOS-Base.repo
5）生成阿里云yum源緩存并更新yum源
yum makecache
yum update
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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