Difference between revisions of "Kubernetes services"

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A Kubernetes [[service]] is an abstraction which defines a logical set of [[Pods]] and a [[policy]] by which to access. <ref>https://kubernetes.io/docs/concepts/services-networking/service/</ref>
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A Kubernetes [[service]] is an abstraction which defines a logical set of [[Pods]] and a [[policy]] by which to access. When you create a Service, it creates a corresponding [[DNS]] entry.
 +
* https://kubernetes.io/docs/concepts/services-networking/service/
 +
* <code>[[kind: Service]]</code>
  
 +
== Commands ==
 +
* <code>[[kubectl create clusterip]]</code>
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* <code>[[kubectl create service loadbalancer]]</code>
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* <code>[[kubectl create nodeport]]</code>
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* <code>[[kubectl create service externalname]]</code>
 +
 +
== Example ==
 
Kubernetes sample service: <code>my-service</code>
 
Kubernetes sample service: <code>my-service</code>
 
  apiVersion: v1
 
  apiVersion: v1
  '''[[kind]]: Service'''
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  '''[[kind: Service]]'''
 
  metadata:
 
  metadata:
 
   name: my-service
 
   name: my-service
 
  spec:
 
  spec:
   selector:
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   [[selector:]]
 
     app: MyAppLabel
 
     app: MyAppLabel
   ports:
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   [[ports:]]
 
     - protocol: [[TCP]]
 
     - protocol: [[TCP]]
 
       port: 80
 
       port: 80
 
       targetPort: 9376
 
       targetPort: 9376
  
If targetPort is not specified then same port value is used also as <code>[[targetPort]]</code>
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If <code>targetPort</code> is not specified then same port value is used also as <code>[[targetPort]]</code>
  
 
== Changelog ==
 
== Changelog ==
 +
* [[v1.31]] (Aug 2024) [[K8s traffic distribution for Services]]
 
* [[v1.18]] (March 2020) <code>AppProtocol</code> is a new optional field on ports in [[Endpoints]] and [[Services]]
 
* [[v1.18]] (March 2020) <code>AppProtocol</code> is a new optional field on ports in [[Endpoints]] and [[Services]]
 
  
 
== Related terms ==
 
== Related terms ==
 
* <code>[[kubectl get services]]</code>
 
* <code>[[kubectl get services]]</code>
* [[CKA v1.15]]: Understand Services
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* <code>[[kubectl get svc]]</code>: <code>[[CLUSTER-IP]]      [[EXTERNAL-IP]]</code>
* [[CKA v1.18]]: Understand Services and other [[network primitives]]
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* <code>[[kubectl delete services]] hello-minikube</code>
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* [[Deployments]]
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* <code>[[ConfigMaps]]</code>
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* <code>[[kubectl port-forward]]</code>
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* [[Kubernetes Endpoints]]: <code>[[kind: Endpoint]]</code>
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* <code>[[kind: ReplicaSet]]</code>
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* <code>[[kubectl expose]]</code>
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* [[Kubernetes headless service]]
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* [[Terraform resource: kubernetes_service]]
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* [[Kubernetes events]]
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* <code>[[service.beta.kubernetes.io]]</code>
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* [[service.externalTrafficPolicy]]=Cluster
 +
 
 +
== Activities ==
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* Review [[CKA 1.23]]: 20% - [[Kubernetes services|Service]] & [[Kubernetes networking|Networking]]
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* Review [[CKA v1.18]]: Understand Services and other [[network primitives]]
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* Review [[CKA v1.15]]: Understand Services
  
 
== See also ==
 
== See also ==
* {{CKA}}
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* {{Kubernetes services}}
* {{K8s}}
 
 
 
  
 
[[Category:Kubernetes]]
 
[[Category:Kubernetes]]

Latest revision as of 15:07, 12 September 2024

A Kubernetes service is an abstraction which defines a logical set of Pods and a policy by which to access. When you create a Service, it creates a corresponding DNS entry.

Commands[edit]

Example[edit]

Kubernetes sample service: my-service

apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: MyAppLabel
  ports:
    - protocol: TCP
      port: 80
      targetPort: 9376

If targetPort is not specified then same port value is used also as targetPort

Changelog[edit]

Related terms[edit]

Activities[edit]

See also[edit]

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