適用於：

1.內網安裝docker

2.內網升級docker

debian 8

sudo apt-get update
sudo apt-get install -d apt-transport-https ca-certificates curl gnupg2 software-properties-common
#預設下載路徑
/var/cache/apt/archives
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get install -d docker-ce=18.06.1

參考：https://docs.docker.com/install/linux/docker-ce/debian/