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OpenShiftTM vs Kubernetes

What will you learn:-

What is OpenShift

Developed by Red Hat, OpenShiftTM is a containerization software solution whose prime product is OpenShiftTM container platform, a PaaS managed by Kubernetes. OpenShiftTM has been often called “Enterprise Kubernetes” by its vendor – Red Hat & is written in a combination of both “Go” & “Angular JS”.

Red Hat OpenShiftTM is available in four models:

Though the implementations and locations on which they run and the pricing models differ, the actual underlying OpenShiftTM code and functionality are identical.

OpenShiftTM Architecture

In OpenShiftTM we can either choose to use our own on-premises hardware or a cloud provider.

On top of this, we’re going to have an operating system to work with OpenShiftTM Kubernetes Distribution, which is generally Red Hat Enterprise Linux or CentOS.

  • OpenShift
  • Kubernetes
  • Core OS
  • Private Hardware/Cloud Provider

On top of that, we have a Kubernetes layer. OpenShiftTM uses Kubernetes for orchestrating containers. It provides cluster management and orchestrates containers on multiple hosts.

Finally, we have OpenShiftTM which is an abstraction on top of Kubernetes and makes a lot of difficult tasks – like deploying applications and doing day to day operations easier by building a web console in the CLI.

What is Kubernetes

Kubernetes, aka, K8s is an open-source system for automating deployment, scaling, and managing containerized applications. It handles the work of scheduling containers onto a compute cluster and manages the workloads to ensure they run as the user intends.

Kubernetes Architecture

It has two major components:-

- Master Node - The master node receives input from the CLI or UI as it is the entry point for all the administrative tasks.

It has the following four components:-

- Worker Node - Worker nodes contain all the necessary services to manage the networking between the containers, communicate with the master node, and assign resources to the scheduled containers.

It’s two major components are:-

Kubernetes

OpenShift vs Kubernetes

Here we attempt to compare features between the two technologies

Feature OpenShiftTM Kubernetes
Product or Project Although a product, also available as an open-source version. Is an open-source project
Deployment It has DeploymentConfig object implemented by logic.It doesn’t support concurrent updates. It has Deployment objects implemented internally in controllers. Better in dealing with multiple concurrent updates.
Router vs Ingress Router Object allows routes created by developers to be used by external clients. Default Router is HAProxy Container Ingress Objects allow inbound connections to reach the cluster services. Ingress Controller can be implemented by multiple servers like Nginx, GCE, etc.
CI / CD Very easy CI/CD integration using Jenkins CI/CD possible with Jenkins but it is not available within the tool.
Templates OpenShiftTM templates are neither flexible nor user-friendly. Kubernetes Helm templates are easy to use and provide a generous amount of flexibility.
Installation Only RHEL or CentOS Any Linux distribution
Management of Container Images Offers ImageStreams which makes managing container images very easy. Kubernetes doesn’t offer container image management features.
Security Very strict security policies. Easy to maintain the security levels
Cost $$$ N/A to use

Conclusion: OpenShiftTM or Kubernetes

Basically it depends on the requirements of the system and the application that as a user you are trying to build. OpenShift is only compatible with CentOS or RHEL whereas Kubernetes is compatible with any Linux distribution. For Instance, Prismberry’s DataVision, a cloud monitoring solution, is built on Kubernetes Cluster which can be run on any Linux distribution.

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