Single and Multi-Port Service in Kubernetes (K8s)

Port Service

The set of pods can be defined as a service. It provides the one IP and DNS name from that pods that are often accessed. We can easily manage load balancing configurations with help of service, It helps and makes it easy for pods to scale out.

The REST object in the K8s platform is defined as a service where API-server on k8s master creates new instances

1. Service without Selector in k8s:

--- 
apiVersion: v1
kind: Service
metadata: ~
spec: ~
 name: k8s_service
 ports: ~
 targetPort: 30888
 - port: 8080

The above configuration will create a service with the name k8s_service.

2. Service Config File with Selector in k8s :

apiVersion: v1
kind: Service
 metadata: 
name: k8s_service
spec:
  selector:
  application: "My Application"-----------> selector
ports: 
- port: 8080 
targetPort: 30888

We will create an endpoint here as to transfer the traffic we have selector option enabled here

--- 
apiVersion: v1
kind: Endpoints
metadata: ~
subnets: ~
 address: 
  ip: "192.158.158.30"
  ports: ~
 name: k8s_service
 - port: 8080

In the above code, we have created an endpoint that will route the traffic to the endpoint defined as 192.158.158.30:8080.

3. Multi-Port Service Creation:

--- 
apiVersion: v1
kind: Service
metadata: "~ name:k8s_service"
spec: "selector:  application:\"My Application\" " ------> selector
? "  -name"
: http
? "  Port"
: 443
? "  Protocol"
: TCP
? "  TCP port"
: 80 
? "  protocol"
: ~
? "  targetPort"
: 30889
: 30888
ClusterIP: "10.30.10.122"
 ports: ~

Types of Services in Kubernetes:

ClusterIP in K8s− This helps in restricting the service within the cluster. It exposes the service at intervals the outlined Kubernetes cluster.

spec:
  type: NodePort
  ports:
  -port: 8080
   nodePort: 30888
   name: NodeportService

NodePort in k8s− it’ll expose the service on a static port on the deployed node. A ClusterIP service to that NodePort service can route, is mechanically created. The service is accessed from outside the cluster exploitation of the NodeIP:nodePort.

spec:
  ports:
  -port: 8080
   nodePort: 30888
   name: NodeportService
   clusterIP:10.22.31.189

Load Balancer in k8s−. NodePort and ClusterIP services are Provisioned automatically to which the ELB will route the traffic forward to the application.

A full-service YAML file with service kind as Node Port. Let us create one:

--- 
apiVersion: v1
k8s-app: appname
kind: Service
labels: ~
metadata: ~
name: appname 
spec: ~
 component: nginx
 env: env_name
 k8s-app: appname
 name: devnginx
 nodePort: 30888
 ports: 
  - 
    port: 8080
 selector: ~
 type: NodePort

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