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This article introduces the knowledge of "how to use Kubernetes services to expose applications". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Kubernets Services

In fact, the Pods in the same cluster has a separate ip, but these ip are only used within K8s and are not exposed to the public. In order to solve the problem of termination, deletion or replacement of pods, K8s distributes group messages to Pods through Services, so that pods and its programs can automatically discover services. K8s Service is for Pods: logical cluster partition, enables external traffic exposure (to make external traffic show? A layer of abstraction for load balancing and service discovery

Service correctly directs external traffic to pods through pods's independent internal ip and port in cluster. If you want the internal service to be accessible from the outside, you need the following parameters:

LoadBalancer (load balancer)-provide an IP address (like IP provided by AWS or GCP cloud service)

NodePort-all Node in a cluster expose the same port to the Servce through the NAT mode.

Services overview

Service provides load balancing of traffic for the Pods it manages. This is useful when there is a set of Pods in the deployer of a service. In the next section, the application we created will be deployed with multiple instances.

Service is also responsible for service discovery (covered in Accessing the Service) in a cluster. For example, a web service can accept traffic from back-end services directly, regardless of Pods.

Service uses Label Selectors (tag selector) to match a set of Pods. Label Selectors is a set of components on Label that allow logical operations.

Label is a key/value key-value pair, hashtags from social media, attached to objects such as Pods (can be seen as a topic tag example: # title). Label is used to identify relationships between objects in a similar manner:

Environment for Production environment (production, test, dev) products (production, testing, development version)

Application version (beata,v1.3) program version

Type of service/service (fronted,backen,database) service type (front end, back end, database)

Labels

Label can be attached to an object when or after it is created, or it can be changed at any time. The Kubectl run command has already set the default Labels/Labels Selectors when the new Pods/Deployment is executed. The link between Labels and Label Selectors in Deployment determines the relationship between Pods.

That's all for "how to expose applications using Kubernetes Services". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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