1.参考：

https://xuxinkun.github.io/2018/09/03/graph-easy/http://bloodgate.com/perl/graph/manual/faq.html

2.经典例子：描绘kubernetes主要组件的联系图

[clouder@xiaowei ~]$ echo '[kubectl],[kube-proxy],[kube-scheduler],[kube-controller],[kubelet]->[kube-api]->[etcd]' |graph-easy

+------------+                        |  kubectl   |                        +------------+                          |                          |                          v+-----------------+     +------------+     +---------+| kube-controller | --> |            | --> |  etcd   |+-----------------+     |  kube-api  |     +---------++-----------------+     |            |     +---------+| kube-scheduler  | --> |            | <-- | kubelet |+-----------------+     +------------+     +---------+                          ^                          |                          |                        +------------+                        | kube-proxy |                        +------------+

3. 线上加上标：echo "[guangzhou]-- car -->[chaozhou]-- plain --> [guangzhou]" |graph-easy

plain  +----------------------+  v                      |+-----------+  car     +----------+| guangzhou | -------> | chaozhou |+-----------+          +----------+

4.多个对象指向一个目标：

[clouder@xiaowei ~]$ echo '[b],[c]-->[a]'|graph-easy +---+     +---+     +---+| b | --> | a | <-- | c |+---+     +---+     +---+