Outside access over hostport documented

[Hermain]

Discussed in #194

[hamshif]

@solsson thank you for the attention.
I recently moved to use local docker kubernetes (from minikube) and
OUTSIDE_HOST=$(kubectl get node "$NODE_NAME" -o jsonpath='{.status.addresses[?(@.type=="ExternalIP")].address}')
won't woork because the node has no externalIP.
`➜ ~ kubectl describe node docker-for-desktop | grep IP
InternalIP: 192.168.65.3
➜ ~ kubectl describe node docker-for-desktop
Name: docker-for-desktop
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/hostname=docker-for-desktop
node-role.kubernetes.io/master=
Annotations: node.alpha.kubernetes.io/ttl=0
volumes.kubernetes.io/controller-managed-attach-detach=true
Taints:
CreationTimestamp: Thu, 16 Aug 2018 09:19:57 +0300
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message

---

OutOfDisk False Wed, 05 Sep 2018 09:13:15 +0300 Tue, 04 Sep 2018 09:11:34 +0300 KubeletHasSufficientDisk kubelet has sufficient disk space available
MemoryPressure False Wed, 05 Sep 2018 09:13:15 +0300 Tue, 04 Sep 2018 09:11:34 +0300 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Wed, 05 Sep 2018 09:13:15 +0300 Tue, 04 Sep 2018 09:11:34 +0300 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Wed, 05 Sep 2018 09:13:15 +0300 Thu, 16 Aug 2018 09:19:47 +0300 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Wed, 05 Sep 2018 09:13:15 +0300 Tue, 04 Sep 2018 09:11:14 +0300 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.65.3
Hostname: docker-for-desktop
Capacity:
cpu: 4
ephemeral-storage: 61252420Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8164620Ki
pods: 110
Allocatable:
cpu: 4
ephemeral-storage: 56450230179
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8062220Ki
pods: 110
System Info:
Machine ID:
System UUID: 10F1417D-0000-0000-8198-B63A7170DCDA
Boot ID: aa9efe87-3ca6-4831-80c1-13ba490b5d86
Kernel Version: 4.9.93-linuxkit-aufs
OS Image: Docker for Mac
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://18.6.1
Kubelet Version: v1.10.3
Kube-Proxy Version: v1.10.3
ExternalID: docker-for-desktop
Non-terminated Pods: (19 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits

---

docker compose-7447646cf5-ddq5m 0 (0%) 0 (0%) 0 (0%) 0 (0%)
docker compose-api-6fbc44c575-ztvrd 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kafka avro-rest-68578bfcb7-d9lp9 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kafka avro-schemas-6f49d8f7fb-8zb75 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kafka kafka-0 100m (2%) 0 (0%) 512Mi (6%) 0 (0%)
kafka kafka-1 100m (2%) 0 (0%) 512Mi (6%) 0 (0%)
kafka kafka-2 100m (2%) 0 (0%) 512Mi (6%) 0 (0%)
kafka pzoo-0 10m (0%) 0 (0%) 100Mi (1%) 0 (0%)
kafka pzoo-1 10m (0%) 0 (0%) 100Mi (1%) 0 (0%)
kafka pzoo-2 10m (0%) 0 (0%) 100Mi (1%) 0 (0%)
kafka zoo-0 10m (0%) 0 (0%) 100Mi (1%) 0 (0%)
kafka zoo-1 10m (0%) 0 (0%) 100Mi (1%) 0 (0%)
kube-system etcd-docker-for-desktop 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-apiserver-docker-for-desktop 250m (6%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-controller-manager-docker-for-desktop 200m (5%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-dns-86f4d74b45-kthhb 260m (6%) 0 (0%) 110Mi (1%) 170Mi (2%)
kube-system kube-proxy-trxmt 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-scheduler-docker-for-desktop 100m (2%) 0 (0%) 0 (0%) 0 (0%)
kube-system tiller-deploy-df4fdf55d-lv2xf 0 (0%) 0 (0%) 0 (0%) 0 (0%)
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
CPU Requests CPU Limits Memory Requests Memory Limits

---

1160m (28%) 0 (0%) 2146Mi (27%) 170Mi (2%)
Events:
➜ ~`
I will try this on GCP perhaps it's a local peculiarity