Docker三剑客：
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Docker-Machine
- Docker Machine is a tool that lets you install Docker Engine on virtual hosts, and manage the hosts with
docker-machinecommands.
- Docker Machine is a tool that lets you install Docker Engine on virtual hosts, and manage the hosts with
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Docker-Swarm
- 把多个Docker Engine聚集在一起，形成一个大的docker-engine，对外提供容器的集群服务。
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Docker-Compose
- 是一个编排多容器分布式部署的工具，提供命令集管理容器化应用的完整开发周期，包括服务构建，启动和停止。
Docker-Swarm Architecture
