Last updated on Nov 20, 2023
Kubernetes is a popular DevOps tool that is chiefly used to manage containerized applications and services. It can be defined as a tool that is used to “orchestrate containerized cloud-native microservices apps.”
No matter how complex it may sound, it simply means that Kubernetes is used to manage applications that include numerous processes like deployment and scaling. The word container or containerized means that here all the applications are treated or run as containers.
If you think about cloud-native, it gives an impact. It is something related to the cloud, so it means the application can achieve cloud demands like automatic rollbacks and self-healing. Also, the term microservices state that there are a lot of small independent parts that complete the application and make it a complete package.
To summarise, Kubernetes is a powerful tool used to manage containerized applications which certainly have a lot of things going on. And, while at it the DevOps tools make it smoother for containerized applications to move over from one cloud to another.
Before moving to Kubernetes Ingress let’s have a look at some reasons why you should use Kubernetes.
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Kubernetes is the DevOps tool that is primarily used by engineers or technology experts for enabling easy deployments of containerised applications. The biggest problem that applications with complex dependencies face is updation and migration. So, this problem is easily sorted by Kubernetes, as it bundles all of the required things in the container form.
Talking about containers, they provide a lot of agility to run cloud-native applications on any infrastructure. Also, with containers the portability and scalability increase. If there has to be some application ramping or production spike, it can be easily done within no time as compared to the previous times.
The tool automates a lot of DevOps applications making the entire process more impactful and smoother. Some of those “automated” DevOps applications include - resource scheduling, health checkups, rollbacks, and releases.
Now, when you know all about Kubernetes, it’s time to check about Kubernetes Ingress and followed by Kubernetes Controller.
Sometimes you might need access to your Kubernetes services from outside the cluster and this is when you would need Kubernetes Ingress. The latter is an API Object that enables the external users to access the internal Kubernetes services by providing routing rules.
Two things make the Kubernetes Ingress - an API Object and a Controller. While Ingress API Object enables the management of external access, Ingress Controller is responsible for the implementation of the API Object.
You should know that Ingress is just a set of rules which can be deployed but it won’t do much unless a controller is present to process those rules. Ingress Controller is to be configured in the cluster for the implementation of Ingress. The Controller is actually a load balancer that routes external traffic to the Kubernetes cluster.
Also, it must be noted that Ingress runs as pods after all it is a part of the Kubernetes cluster. Finally, it is of utmost importance that you choose the correct service with the required specifications for exposing your application to the Internet.
After Kubernetes Ingress, it is equally important to know about different applications that are used for a similar purpose.
Apart from Ingress also, there are three other popular options for exposing applications:
Each of these options has its specific way of exposing a service.
Let’s compare all of the three above along with Kubernetes Ingress.
If you are looking for internal service access, ClusterIP is something you need. To access the services ClusterIP utilises the internal IP address.
If you are looking for a service for a Static Port number, NodePort is something you need. It is actually a Virtual Machine used on a Static Port number to expose a service, especially in a non-production setup.
LoadBalancer does the work similar to Kubernetes Ingress, i.e. being used in a production environment. To expose services to the internet LoadBalancer needs an external LoadBalancer.
If you are looking for an extremely sorted tool that not only lets you collate all the routing rules in a single resource but also runs as an internal part of the Kubernetes cluster, Ingress is what you need. It enables you to expose applications in the production environments to the internet.
Ingress is preferred over LoadBalancer as external Load Balancers are expensive and have to be managed externally. While Ingress is all about the Kubernetes cluster so it can be internally managed from the cluster.
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By now, you would be well versed with everything you need to begin with Kubernetes Ingress. You began with learning about the basics of Kubernetes and went on to understand the reasons why Kubernetes is so popular.
After you had a firm grip over “What is Kubernetes” and “Why Kubernetes”, you went to learn about the popular exposing application, Kubernetes Ingress. While learning about Kubernetes Ingress you also checked an integral part of Ingress in great detail, Kubernetes Controller. While at it you learned how Controller complements the API Object and makes an entire package.
Finally, you discovered some other exposing applications to compare Kubernetes Ingress. In that, you saw three services other than Ingress and learned their applicability. It must be noted that while choosing an exposing service you must take a lot of things into consideration.
As a senior technical content writer for HRK tainings, srivalli patchava has a greater understanding of today's data-driven environment, which includes key aspects of data management and IT organizations. She manages the task of creating great content in the areas of software testing, DevOps, Robotic process automation. Connects with her on Linkedin and Twitter.
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