1
// 도커  다운을 위한 필요한 패키지  설치
apt-get update && apt-get -y install apt-transport-https ca-certificates curl gnupg lsb-release
참고
https://roseline124.github.io/kuberdocker/2019/07/17/docker-study02.html

2
도커 다운로드 
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

4
cat /etc/apt/sources.list.d/docker.list

5
# 도커 설치
apt-get update && apt-get -y install docker-ce docker-ce-cli containerd.io