Services — Kubernetes

In Kubernetes, a Service is a method for exposing a network application that is running as one or more Pods in your cluster.

Pod IP are ephemeral in nature.

Pod IP’s are not static they keep changing.

Service ← Theory Part

Service 2

Advantages

Maintaining a infront of static IP

Load Balancing

Loose Coupling

Kubernetes Service types allow you to specify what kind of Service you want.

ClusterIP — Is accessible only within the cluster

NodePort — Exposes the Service on each Node’s IP at a static port

LoadBalancer — Exposes the Service externally using an external load balancer

Selector → Should match with the pod label ← which pod to be forward?

TargetPort → Is the actual port on which your app is running inside the container ← which port to be forward?

ClusterIP → accessible only within the cluster

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
  - image: nginx
    name: nginx-ctr

Execute the pod

kubectl apply -f nginx-pod.yml
kubectl get pods