0. Environment

• Ubuntu 22.04 LTS
• VirtualBox
• Master Node 1 + Worker Node 2

i. Update apt storage

1. apt 업데이트

sudo apt-get update

sudo apt-get install \\
    ca-certificates \\
    curl \\
    gnupg \\
    lsb-release

2. docker public GPG key 추가

curl -fsSL <https://download.docker.com/linux/ubuntu/gpg> | sudo gpg --dearmor -o /usr/share/keyrin

3. stable repository 설정

echo \\
  "deb [arch=$(dpkg --print-architecture) 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