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Kubernetes Service in DevOps

Kubernetes Service, Load Balancing, and Networking :
  • Services
  • DNS for Services and Pods
  • Connecting Application with Services
  • Ingress
  • Network Policies
  • Adding entries to Pod/etc/hosts with HostAliases
Services :

It can be defined as an abstraction on the top of the pod which provides a single IP address and DNS name by which pods can be accessed.

With Service, it is very easy to manage load balancing configuration . It helps pods to scale very easily.

The set of pods targeted by a Service is (usually) determined by a label selector .
A Kubernetes Service is an abstraction which defines a logical set of Pods and a policy by which to access them - sometimes called a micro-service. 
  • Defining a service
  • Virtual IPs and service proxies
  • Multi-Port Services
  • Choosing your own IP address
  • Discovering service
  • Headless services
  • Publishing services - service types
  • Shortcomings
  • Future work
  • The gory details of virtual IPs
  • API Object
  • SCTP support
Defining a Service :

A Service in Kubernetes is a REST object, similar to a Pod. Like all of the REST objects, Service definition can be POSsted to the apiserver to create a new instance.

For Example :

Service with Selector -

kind: Service
apiVersion: V1
metadata:
     name: my-service
spec:
      Selector:
          app: MyApp
     ports:
  - protocol: TCP
port: 80
targetPort:  9376

Services without selectors:
kind: Service
apiVersion: v1
metadata:
   name:  my-service
spec:
 ports:
-protocol: TCP
 port: 80
 targetPort:  9376

Because this service has n0 selector, the corresponding Endpoints object  will not be created. You can manually map the service to your own specific endpoints:
kind: Endpoints
apiVersion: v1
metadata:
    name: my-service
subsets:
- addresses:
 - ip: 1.2.3.4
ports:
 - port: 9376




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