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Install Docker Engine on Ubuntu

Updated at 23.10.16
  1. Update apt package manager 
    sudo apt-get update
  2. Install prerequisite package for docker 
    sudo apt-get install ca-certificates curl gnupg
  3. Add Docker's GPG key 
    sudo install -m 0755 -d /etc/apt/keyrings

    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
  4. Set up the repository of stable version 
    echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
  5. Install Docker engine 
    sudo apt-get update

    sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
  6. Verify that the Docker Engine installation is successful by running the hello-world image 
    sudo docker run hello-world

Set up the manage docker as a non-root user

현재는 모든 docker 작업 권한이 root 유저에게만 있으므로 sudo를 붙여주어야 한다.
따라서, root 유저가 아닌 host의 기본 유저에게도 권한을 주기 위해 추가적인 설정이 필요하다.

1. Add your user to the docker group. 
sudo groupadd docker
sudo usermod -aG docker $USER
2. (VM Restart) 
sudo service docker restart
newgrp docker
3. Verify that you can run docker commands without sudo 
docker run hello-world

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