ubuntu16.04更改源为阿里源

一、通过系统更换源

第一步：备份原来的源文件
cd /etc/apt/  
然后会显示下面的源文件sources.list
输入命令
sudo cp sources.list sources.list.bak
就是将sources.list备份到sources.list.bak
第二步：替换源
阿里云源的文件
    deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse  
    deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse  
    deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse  
    deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse  
    ##测试版源  
    deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse  
    # 源码  
    deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse  
    deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse  
    deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse  
    deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse  
    ##测试版源  
    deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse  
    # Canonical 合作伙伴和附加  
    deb http://archive.canonical.com/ubuntu/ xenial partner  
    deb http://extras.ubuntu.com/ubuntu/ xenial main  
替换并保存
sudo gedit sources.list打开文件，替换成阿里云文件即可
第三步：更新源和软件
   sudo apt-get update 更新源  
   sudo apt-get upgrade 更新软件

二、通过dockerfile更换ubuntu镜像中的源为阿里源

在dockerfile中增加如下步骤：

RUN sed -i s/archive.ubuntu.com/mirrors.aliyun.com/g /etc/apt/sources.list \
    && sed -i s/security.ubuntu.com/mirrors.aliyun.com/g /etc/apt/sources.list \
    && apt-get update && apt-get upgrade