initial prototype

hap.py

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+#!/usr/bin/env python3
+# "Have-A-Port" | ephemeral port picker for LoadBalancer-type Kubernetes services in clusters with a single-address external address pool
+from kubernetes import client, config
+import random
+
+SVC_TYPE = 'LoadBalancer'
+
+# load client configuration (kubeconfig)
+config.load_kube_config()
+
+# establish API connection
+connection = client.CoreV1Api()
+# query service objects
+all_services = connection.list_service_for_all_namespaces(watch=False)
+
+# determine ports in use
+ports_per_svc = [ svc.spec.ports for svc in all_services.items if svc.spec.type == SVC_TYPE]
+used_ports = [svc_port.port for svc_ports in ports_per_svc for svc_port in svc_ports]
+
+# determine available ports
+full_port_range = (range(49152, 65536)) # https://tools.ietf.org/html/rfc6335#section-8.1.2
+available_ports = list(set(full_port_range) - set(used_ports))
+
+# pick an available port
+print(random.choice(available_ports))

requirements.txt

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+kubernetes==10.0.1