docker容器内apt-get换源

#复制原文件备份
mv /etc/apt/sources.list /etc/apt/sources.list.bak

#修改sources.list
cat <<EOF >/etc/apt/sources.list
deb http://mirrors.ustc.edu.cn/debian stable main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free
EOF

#更新apt
apt update

#安装vim命令
apt install vim

#还原sources.list文件
mv /etc/apt/sources.list.bak /etc/apt/sources.list