（转）用graph-easy描绘kubenetes描绘k8s组件逻辑图

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 |
+---+     +---+     +---+