Continue to advance to Kubernetes, the last article Docker Swarm In Action, After understanding Swarm, it is necessary to get familiar with Docker Compose. Docker Swarm forms a cluster of Docker hosts. As long as the Manager node is notified when the service is deployed, it will automatically find the corresponding node to run containers. Compose is another concept entirely. It organizes multiple associated containers into a whole for deployment, such as a load balance container, multiple web containers, and a Redis cache container to make up a whole bundle.

Revealed by its name, Compose, the concept of container orchestration was officially established. Later, Kubernetes, which we will learn, it's a tool for higher-level organization, operation and management of containers. Because Compose organizes the containers, it can start multiple associated containers with one command, instead of starting one container separately.

Regarding the installation of Docker Compose, Docker Desktop under Mac OS X comes with docker-compose; since Docker Compose is written in Python, we can use  pip install docker-compose  to install it, and use its commands after installation docker-compose. Read More

继续向 Kubernetes 进发，上一篇 Docker Swarm 集群模式实操 了解完 Swarm 后，有必要对 Docker Compose 了解一番。Docker Swarm 是把 Docker 宿主机组成集群，部署服务时只要告知 Manager 节点，它就会自动找到相应节点去运行相应的容器。Compose 完全是另一个概念，它把相关联的多个容器组织成一个整体来部署，如由负载容器，多个 Web 容器和一个 Redis 缓存容器构成一个整体。

由其名 Compose 正式有了容器编排这么一个概念，后来将要学的 Kubernetes 是更高级别的组织，运行，管理容器的工具。Compose  由于把容器组织起来了，所以能够一条命令启动多个相关联的容器，而无需单独启动一个一个的容器。

关于 Docker Compose  的安装，在 Mac OS X 下的  Docker Desktop 自带了 docker-compose; 由于 Docker Compose 是用 Python 编写的，我们可以用  pip install docker-compose 的安装，安装后使用它的命令就是 docker-compose。

下方的 Docker Container, Swarm, Compose 三者之间的关系图很形像 Read More