競合パッケージ削除

sudo apt remove -y docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc

必要パッケージ

sudo apt update
sudo apt install -y ca-certificates curl

Docker公式GPGキー保存

sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

Docker公式APTリポジトリ追加

sudo tee /etc/apt/sources.list.d/docker.sources > /dev/null <<EOF
Types: deb
URIs: https://download.docker.com/linux/ubuntu
Suites: $(. /etc/os-release && echo “${UBUNTU_CODENAME:-$VERSION_CODENAME}”)
Components: stable
Signed-By: /etc/apt/keyrings/docker.asc
EOF

インストール

sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

起動確認

sudo systemctl status docker –no-pager

Dockerをsudoなしで使う設定

sudo groupadd docker 2>/dev/null || true
sudo usermod -aG docker $USER

起動時自動起動

sudo systemctl enable docker

バージョン確認

docker –version
docker compose version