zh-trans: add cluster.md (#11247)

* zh-trans: add cluster.md

zh-trans: add cluster.md

* Update cluster.md

content/zh/docs/reference/glossary/cluster.md

@@ -0,0 +1,43 @@
+---
+title: 集群
+id: cluster
+date: 2018-04-12
+full_link: 
+short_description: >
+  集群由一组被称作节点的机器组成。这些节点上运行 Kubernetes 所管理的容器化应用。
+
+aka: 
+tags:
+- fundamental
+- operation
+---
+
+<!--
+---
+title: Cluster
+id: cluster
+date: 2018-04-12
+full_link: 
+short_description: >
+  A set of machines, called nodes, that run containerized applications managed by Kubernetes.
+
+aka: 
+tags:
+- fundamental
+- operation
+---
+-->
+
+<!--
+ A set of machines, called nodes, that run containerized applications managed by Kubernetes.
+-->
+
+  集群由一组被称作节点的机器组成。这些节点上运行 Kubernetes 所管理的容器化应用。
+
+<!--more--> 
+
+<!--
+A cluster has several worker nodes and at least one master node.
+-->
+
+集群由至少一个主节点和若干个工作节点组成。