How to assign an IP to istio-ingressgateway on localhost? - kubernetes

Question

I am using kubespray to run a kubernetes cluster on my laptop. The cluster is running on 7 VMs and the roles of the VM's spread as follows:
NAME STATUS ROLES AGE VERSION
k8s-1 Ready master 2d22h v1.16.2
k8s-2 Ready master 2d22h v1.16.2
k8s-3 Ready master 2d22h v1.16.2
k8s-4 Ready master 2d22h v1.16.2
k8s-5 Ready <none> 2d22h v1.16.2
k8s-6 Ready <none> 2d22h v1.16.2
k8s-7 Ready <none> 2d22h v1.16.2
I've installed https://istio.io/ to build a microservices environment.
I have 2 services running and like to access from outside:
k get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
greeter-service ClusterIP 10.233.50.109 <none> 3000/TCP 47h
helloweb ClusterIP 10.233.8.207 <none> 3000/TCP 47h
and the running pods:
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default greeter-service-v1-8d97f9bcd-2hf4x 2/2 Running 0 47h 10.233.69.7 k8s-6 <none> <none>
default greeter-service-v1-8d97f9bcd-gnsvp 2/2 Running 0 47h 10.233.65.3 k8s-2 <none> <none>
default greeter-service-v1-8d97f9bcd-lkt6p 2/2 Running 0 47h 10.233.68.9 k8s-7 <none> <none>
default helloweb-77c9476f6d-7f76v 2/2 Running 0 47h 10.233.64.3 k8s-1 <none> <none>
default helloweb-77c9476f6d-pj494 2/2 Running 0 47h 10.233.69.8 k8s-6 <none> <none>
default helloweb-77c9476f6d-tnqfb 2/2 Running 0 47h 10.233.70.7 k8s-5 <none> <none>
The problem is, I can not access the services from outside, because I do not have the EXTERNAL IP address(remember the cluster is running on my laptop).
k get svc istio-ingressgateway -n istio-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
istio-ingressgateway LoadBalancer 10.233.61.112 <pending> 15020:31311/TCP,80:30383/TCP,443:31494/TCP,15029:31383/TCP,15030:30784/TCP,15031:30322/TCP,15032:30823/TCP,15443:30401/TCP 47h
As you can see, the column EXTERNAL-IP the value is <pending>.
The question is, how to assign an EXTERNAL-IP to the istio-ingressgateway.

Answer 1

First of all, you can't make k8s to assign you an external IP address, as LoadBalancer service is Cloud Provider specific. You could push your router external IP address to be mapped to it, I guess, but it is not trivial.
To reach the service, you can do this:
kubectl edit svc istio-ingressgateway -n istio-system
Change the type of the service from LoadBalancer to ClusterIp. You can also do NodePort. Actually you can skip this step, as LoadBalancer service already contains NodePort and ClusterIp. It is just to get rid of that pending status.
kubectl port-forward svc/istio-ingressgateway YOUR_LAPTOP_PORT:INGRESS_CLUSTER_IP_PORT -n istio-system
I don't know to which port you want to access from your localhost. Say 80, you can do:
kubectl port-forward svc/istio-ingressgateway 8080:80 -n istio-system
Now port 8080 of your laptop (localhost:8080) will be mapped to the port 80 of istio-ingressgateway service.

Answer 2

By default, there is no way Kubernetes can assign external IP to LoadBalancer service.
This service type needs infrastructure support which works in cloud offerings like GKE, AKS, EKS etc.
As you are running this cluster inside your laptop, deploy MetalLB Load Balancer to get EXTERNAL-IP

Answer 3

It's not possible as Suresh explained.
But if you want to access from your laptop you can use in your service type: NodePort, which gives you access from outside the cluster.
You should first obtain the IP of your cluster, then create your service with something like this:
apiVersion: v1
kind: Service
metadata:
name: my-service
spec:
selector:
app: my-app
type: NodePort
ports:
- name: http
protocol: TCP
port: 3000
targetPort: 3000
nodePort: 30000
After that, you can access from your laptop with: http://cluster-ip:30000
There is no need to create an ingress for that.
You should use a port in range (30000-32767), as stated below:
If you set the type field to NodePort, the Kubernetes control plane allocates a port from a range specified by --service-node-port-range flag (default: 30000-32767).

Answer 4

If you are using minikube, just run:
$ minikube tunnel
$ k get svc -n istio-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
istio-ingressgateway LoadBalancer 10.111.187.167 127.0.0.1 15021:31949/TCP,80:32215/TCP,443:30585/TCP 9m48s