Dokcer容器内执行aptgetupdate慢的问题
1. 查看镜像debian版本：
cat /etc/debian_version
2：清空/etc/apt/sources.list文件
echo > /etc/apt/sources.list
3：查看/etc/apt/sources.list内容
cat /etc/apt/sources.list
4：向/etc/apt/sources.list文件写入阿里云镜像地址，具体地址查看阿里云镜像站，根据debian版本确定镜像地址
cat >> /etc/apt/sources.list <<EOF
deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb http://mirrors.aliyun.com/debian-security stretch/updates main
deb-src http://mirrors.aliyun.com/debian-security stretch/updates main
deb http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
EOF
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