proxmox notes

/etc/apt/sources.list

deb http://mirrors.tuna.tsinghua.edu.cn/debian stretch main contrib

deb http://mirrors.tuna.tsinghua.edu.cn/debian stretch-updates main contrib
deb http://mirrors.ustc.edu.cn/proxmox/debian/pve stretch pve-no-subscription
# security updates
deb http://security.debian.org stretch/updates main contrib