直接把它阿里云的镜像覆盖到原来的/etc/apt/sources.list文件
cat > /etc/apt/sources.list << EOF deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb http://mirrors.aliyun.com/debian/ stretch-proposed-updates main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-proposed-updates main non-free contrib EOF
这样再进行apt-get update就快了
apt-get install就可以安装你的程序了，在dockefile里也可以把它添加，方便你的容器里安装软件，这样可以一劳永逸！
FROM microsoft/aspnetcore:2.0 ARG source RUN cat > /etc/apt/sources.list << EOF deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb http://mirrors.aliyun.com/debian/ stretch-proposed-updates main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-proposed-updates main non-free contrib EOF RUN /bin/cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo 'Asia/Shanghai' >/etc/timezone RUN apt-get update && apt-get -y install libgdiplus && apt-get clean WORKDIR /app EXPOSE 80 COPY ${source:-publish} . ENTRYPOINT ["dotnet", "SMS.dll"]
这样以后安软件就快了。