K8s Pods ReplicaSet Deployment Difference Example With Rolling Update - Types Of Service Kubernetes
What are the difference between kubernetes pods, replicasets, deployment with example. How Rolling updates happens in kubernetes with the help of deployment. What are different types of service in kubernetes? How to expose a pod in kubernetes to other services or outside world? How a service connects to a pod?
Services:
Service acts as a network endpoint for other services or external users to connect to
Services are long running object
It has an IP address
It has a stable fixed port
It can be used to connect to pods
How Service connects to a Pod in Kubernetes?
Pods have labels field in form of key:value pairs (app: nginx)
Service have selectors in form of key:values (app: nginx)
Service looks for matching key-value pair among pods
Service can be of different types
Types of Service:
ClusterIP
Service is exposed to internal to Kubernetes Cluster
NodePort
Service would be exposed to outside world(browser). We can choose which port to expose. (Specify nodeport: 30080)
LoadBalancer
Service is exposed to outside world using a Loadblancer of Cloud provider (AWS, GCP).
ExternalName
It does not have selectors and uses DNS names instead
Explore the fundamental components of Kubernetes, the popular container orchestration platform, in this comprehensive guide. Learn about the key building blocks such as Pods, ReplicaSets, and Deployments, and gain insights into their roles within the Kubernetes ecosystem. Delve into the nuances of managing containerized applications, including the crucial concept of rolling updates.
Discover how Pods serve as the smallest deployable units in Kubernetes, encapsulating one or more containers and shared storage resources. Explore ReplicaSets, which provide declarative configurations for maintaining a specified number of identical Pods, ensuring high availability and scalability.
Dive into Deployments, a higher-level abstraction that enables the declarative management of ReplicaSets and facilitates easy updates and rollbacks. Gain a practical understanding of rolling updates, a powerful feature that allows seamless transitions between different versions of your application, minimizing downtime and ensuring reliability.
The guide also sheds light on the various types of services in Kubernetes, including ClusterIP, NodePort, LoadBalancer, and ExternalName services. Learn how each service type enables communication between Pods and external clients, providing the necessary networking functionality to support your applications.
Whether you're a Kubernetes beginner or looking to deepen your knowledge, this guide provides valuable insights and a hands-on example to illustrate the concepts. Stay ahead in the world of container orchestration and enhance your skills in deploying and managing applications with Kubernetes.
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