Linux环境更换阿里源（CentOS+Ubuntu）

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CentOS 1.备份原来的源

• 在控制台输入mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup备份原本的源

2、下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo 

3、非阿里云ECS用户会出现 Couldn't resolve host 'mirrors.cloud.aliyuncs.com' 信息，不影响使用，可以修改配置

  sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo 

4、生成缓存

 yum makecache 

5、查看当前源

 yum repolist 

Ubuntu 1.备份原来的源

• 在控制台输入sudo cp /etc/apt/sources.list /etc/apt/source.list.bk备份原本的源

2.修改源

• 在控制台输入sudo vim /etc/apt/source.list会进入文件
• 按O即可进行插入代码，首先先将文件内的每行前面都加上#
• 接着在尾部粘贴如下代码

deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
 
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
 
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
 
deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
 
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

• 按Esc可以退出插入状态，接着按出 :wq 则会在左下角出现字符，按回车则保存成功

更新源配置及系统

• 在控制台输入 sudo apt-get update sudo apt-get upgrade
• 接着按回车即可进行更新
• 过程中出现此类网址则更换源成功