Outstanding notes about Kubernetes Service

28/06/2023

Kubernetes is a well-known open source platform used to manage and deploy applications in containers on various servers. Service is one of the basic objects in Kubernetes used to provide and manage access to applications in Kubernetes Cluster. Vậy Kubernetes Service có những lưu ý nổi bật nào cho doanh nghiệp khi lựa chọn cho hệ thống.

Table of contents

What does Kubernetes Service include?

Kubernetes Service là một đối tượng quan trọng trong Kubernetes. Nó cho phép cung cấp và quản lý truy cập vào các ứng dụng chạy trên các container trong Kubernetes Cluster. Kubernetes Service bao gồm những yếu tố sau:

Selectors: This is a condition used to select specific Pods to bind to the Service.
Cluster IPs: The internal IP number of the Service on the Cluster, used to access the Service in the Cluster.
Type: There are three types of Service: ClusterIP, NodePort and LoadBalancer, each with different features in implementing access to applications in the Cluster.
Ports: The service has one or more ports, each associated with a port on the containers in the pod.
Endpoints: List of IPs and Ports of Pods making access to the Service, updated automatically when Pods are rotated or when Pods are added or removed.

Kubernetes Service plays an important role in managing access to applications in the Kubernetes Cluster. It simplifies the installation and network configuration of applications in containers and ensures the availability and reliability of applications.

> Tham khảo hệ thống Google Kubernetes Engine

Why use Kubernetes Service

Kubernetes Service is an important object in Kubernetes, it provides many benefits for managing applications running on containers in Kubernetes Cluster:

A stable IP address: Helps ensure applications always have a stable IP address to make connections. When the applications running in the Pod are changed or deleted, the Kubernetes Service automatically updates the list of IP addresses of the remaining applications.
Application Integrity: Kubernetes Service helps ensure that connections sent to the correct application work in the Pod, thus minimizing the probability of failure.
Use networking: Kubernetes Service provides secure networking features such as load balancing, connectivity through network tools, traffic routing, and access rules mechanisms.
Access orchestration: Kubernetes Service allows for orchestration of access to applications in the same load pool or whitelisted location for more security.
Application Reusability: Kubernetes Service simplifies the process of deploying applications in containers, while also helping to reuse applications that have been deployed across multiple clusters.

In short, using Kubernetes Service makes it easier and more efficient to manage access to applications in the Kubernetes Cluster, ensuring the availability and reliability of applications, and also more security.

How Kubernetes Service Works

Kubernetes Service works on Pods containing containers deployed in Kubernetes Cluster.

The operating steps of Kubernetes Service are as follows:

Create Pods: First, the same priority containers are encapsulated in the Pod. Pods contain one or more containers, which interact with each other and make up the complete application.
Set Label: Each Pod has a unique label, which is used for identification and associated with a specific job number.
Declare the Kubernetes Service: The administrator needs to declare a Service, declare a Selector to link Pods with the same label.
Cluster IPs: When the Service is declared, Kubernetes will generate an IP address associated with the Service. This IP address is called the Cluster IP and is only accessible from within the Cluster.
Endpoints: The Kubernetes Service will get a list of Pods that include a label that matches the Selector in the Service's declaration. The list of IP addresses and ports of these Pods is stored in the Endpoint.
BILLIONService ribbon: Through Cluster IP, Kubernetes Service helps to coordinate application requests to respective Pods containing containers with associated labels.

In conclusion, Kubernetes Service uses Pods to provide access to application containers in the Kubernetes Cluster. Kubernetes will identify the respective Pods using the Selector in the Service declaration and dispatch connections and requests to the applications deployed in the containers in the Pod.

Overall conclusion

Với các lợi ích này, Kubernetes Services đã trở thành một công cụ phổ biến và không thể thiếu đối với các hệ thống doanh nghiệp ngày nay.

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