1/更新apt包索引并安装包以允许apt通过 HTTPS 使用存储库：
sudo apt-get update sudo apt-get install ca-certificates curl gnupg
2/添加Docker官方GPG密钥：
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 sudo chmod a+r /etc/apt/keyrings/docker.gpg
3/使用以下命令设置存储库：
echo
"deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu
"$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" |
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
4/安装 Docker 引擎 1、更新apt包索引： sudo apt-get update 2、安装 Docker 引擎、containerd 和 Docker Compose。 sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
5/看下docker版本 docker --version
6/安装DOCKER COMPOSE sudo curl -L "https://github.com/docker/compose/releases/download/$(curl -s https://api.github.com/repos/docker/compose/releases/latest | grep '"tag_name":' | sed -E 's/."([^"]+)"./\1/')/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
docker-compose --version