Due to the massive use of containers in businesses, the container-centric management tool Kubernetes has taken over as the industry standard for deploying and managing containerized applications. Kubernetes was developed on Google Cloud. Google has been running containerized workloads on Kubernetes for 15 years, and the open source community has made significant contributions. Kubernetes simplifies every aspect of deploying and managing your application. Kubernetes offers automated container orchestration, which raises your level of dependability and cuts down on the time and resources needed for routine tasks.
In Kubernetes, a service is an abstraction which denotes a set of conceptual pods where the application executes and an access policy for such pods types. A pod must first determine its IP address before it may connect to another pod. A means to locate certain pods is also provided by the Kubernetes services. In the Kubernetes networking concept, pod IP addresses are abstract; if a pod is destroyed or broken, a new pod would acquire the new IP address. In Kubernetes, a service frequently allows a pod or collection of pods access to the network. Then Services will select pods based on their names, and if a network request is given to these services, it will detect all of the cluster's pods that match the service's label, select one among them, and then send the request to it.
Kubernetes service types are the building blocks of service definitions. Each service type is defined by a set of properties that control how the services interact with each other and the resources they consume. The Kubernetes API uses these properties to create, update, and delete objects within the cluster. You can also combine different types of workloads by using multiple services from multiple service types.
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ClusterIP is a Kubernetes Service Type that allows the pods and services in a cluster to connect using IP addresses or hostnames. It's used primarily to provide external access to your Kubernetes cluster, but it can also be used to expose services on your cluster through a public IP address or DNS name.
l Cluster-wide inter-service communication Consider communication between your app's back & front-end components.
NodePort is the default service type for Kubernetes. It maps to a port on a routable IP address. A nodePort is typically used for services that are not ephemeral but instead need to be bound to a set of ports for which you have control over the availability of those ports on your network (i.e., you can ensure that these services are always available from the same IP address).
At the point when you need to enable the outer network to your service. Utilizing a NodePort allows you to set up your load-adjusting solution and configure environments not fully carry by Kubernetes.
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A load balancer (LB) distributes incoming requests to multiple servers. An LB is typically deployed in front of a set of Kubernetes pods and can be used to direct traffic to the pods. It provides transparent access control, allowing you to specify different rules for different types of traffic. The LB can also scale out in several instances, which helps with high-traffic situations.
When a cloud provider hosts the Kubernetes cluster.
ExternalName is a Kubernetes resource that can represent the name of a service within a pod. This is usually used to create a DNS record for the pod's name, but it can also be used as a key-value store by other Kubernetes resources.
In this example, we will create a service with an external name of "example-service". The external name must start with "example-" and end with ".service".
Conclusion
In this post, we've discussed Kubernetes service types and their use case.
Kubernetes service types are helpful in differentiating between different kinds of Kubernetes resources. In particular, they help you distinguish between stateless and stateful services. Stateful services have more states than stateless ones; for example, a web server might store session information on each request, whereas a database service would not.
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A Kubernetes service of type ClusterIP is a container-based network that provides communication between nodes in a Kubernetes cluster.
All containers in a Kubernetes cluster share the same IP address and port range. Since each container has its own IP address, it's possible to separate services by IP address, which can be useful for managing infrastructure with an open-source environment like Kubernetes.
Kubernetes has many kinds.
The first kind is the kind of Kubernetes that runs on top of CoreOS Linux. It's called Tectonic.
The second kind is the kind that runs on top of OpenStack Nova. It's called Project Calico.
There are also different kinds for each of the other three major cloud providers: Amazon Web Services, Google Cloud Platform, and Microsoft Azure.
Kubernetes service and pods are two ways to manage your applications in Kubernetes. A service is a logical group of pods sharing a common set of capabilities.
Pods and services work together to provide isolation and security for your applications, which allows you to run multiple containers in different environments without affecting each other's performance.
Kubernetes is called k8 for short. Kubernetes is short for "Kubernetes container orchestrator", but it's also a play on the word "kudos", which means "thanks". So to sum up: k8 is thanks for giving me a chance to be this witty.
A node is a computer that runs Kubernetes, the software that manages your cluster.
You might not notice this at first because it's all behind the scenes, but nodes are what make Kubernetes possible. Without them, you wouldn't be able to run an app in production or manage your cluster as a whole.