kubernetes - 服务类型 : NodePort & LoadBalancer 有什么区别

Question

apiVersion: v1
kind: Service
metadata:
  name: nginx 
  labels:
    name: nginx
spec:
  ports:
    # the port that this service should serve on
  - port: 80 
    targetPort: 80
    nodePort: 30000 
  selector:
    name: nginx
  type: NodePort

apiVersion: v1
kind: Service
metadata:
  name: nginx 
  labels:
    name: nginx
spec:
  ports:
    # the port that this service should serve on
  - port: 80 
    targetPort: 80
    nodePort: 30000 
  selector:
    name: nginx
  type: LoadBalancer 

两种方法都支持负载均衡器。
并且端口范围在30000-32000之间，为什么？
如果我想使用3000端口，我该怎么做？

Answer 1

http://kubernetes.io/v1.0/docs/user-guide/services.html#type-nodeport :

If you set the type field to "NodePort", the Kubernetes master will allocate a port from a flag-configured range (default: 30000-32767).

存在与主机上运行的真实事物发生低端口冲突的风险。这就是端口受限的原因。您仍然可以配置 kube-apiserver - 标志 --service-node-port-range=
http://kubernetes.io/v1.0/docs/admin/kube-apiserver.html