What is OpenShift?
The OpenShift application platform from Red Hat allows engineers to develop and deploy large-scale applications. OpenShift is one of the most popular cloud platforms for deploying container-based architectures, due to its built-in Kubernetes cluster and enterprise-grade features.
With OpenShift, you can manage applications written in Java, Ruby, Node.js, Perl, Python, and Node.js among others. The key feature of OpenShift is its extensibility, which helps users support applications written in other languages.
The OpenShift cloud migration platform helps organizations move traditional application infrastructures to the cloud from physical or virtual mediums.
With OpenShift, application developers can build and deploy a vast number of applications quickly. For developers and users, OpenShift offers three types of platforms.
1. Infrastructure as a Service (IaaS)
With this service delivery model, the service provider provides virtual machines with a number of pre-defined configurations for virtual hardware. AWS, Rackspace, Google Cloud, and many other companies compete in this space.
Having an IaaS after going through a lengthy setup and investment procedure has the major drawback of having to install and maintain operating systems and packages, manage the network, and handle basic system administration.
2. Software as a Service (SaaS)
It is the least worrying to deal with SaaS infrastructure. Signing up for the service and starting to use it is as simple as plug-and-play.
Generally, a drawback of this setup is that minimal customization can be performed with this setup.
One of the most common SaaS examples is Gmail, where the user has to log in to use it. Minor changes can also be made to an account by the user. In addition, the developer may not find it that useful.
3. Platform as a Service (PaaS)
In this sense, SaaS stands in between IaaS and SaaS. The primary audience of PaaS evaluation is developers who can easily spin up their development environments.
All the development needs can be met by these environments, from having a web application server to have a database.
OpenShift Console has developer and administrator views. Users can access the administrator’s view to monitoring the container’s resources, its health, manage its users, and work with its operators.
History of OpenShift
- In 2005, Red Hat acquired Makara, which led to the creation of OpenShift. The company has a proprietary solution based on Linux containers.
- In May 2011, OpenShift was announced. The technology was proprietary until May of 2012 when it became open-source. Until v3, the container and container orchestration technologies were customized.
- Since v3, container technologies like Docker have been adopted, and container orchestration technologies like Kubernetes have been developed.
- There are many other changes in v4 as well, such as the use of CRI-O for container runtime (and Podman to interact with pods and containers), and Buildah for container build, removing the dependency on Docker.
Architecture of OpenShift
Kubernetes and Docker clusters bind each layer to the previous layer in Open Shift's layered system. With OpenShift, Docker containers are supported and managed using Kubernetes, which hosts all the layers on top.
OpenShift V3 supports containerized infrastructure, as opposed to OpenShift V2. Docker facilitates the creation of lightweight Linux containers, and Kubernetes facilitates orchestrating and managing containers across multiple hosts.
Originally known as OpenShift V2, the platform is primarily driven by gears and cartridges. There are specifications for each component, starting from the creation of the machine to deploying an application.
- Cartridges: They served as a starting point for building a new application to be run in a particular environment and to enable all the dependencies in this section to work.
- Gear: refers to the bare metal machine or server with its own specification regarding memory, processing power, and storage. They were considered as the fundamental units for running an application.
- Application: Any application installed or run on OpenShift will be called an application here.
OpenShift offers a variety of formats and services. OpenShift had three major versions in the early days.
- OpenShift Origin: is a community-based and open-source version of OpenShift. Originally, the upstream project also covered versions 2 and 3.
- OpenShift Online: It is a public PaaS as a service hosted on Amazon Web Services.
- OpenShift Enterprise: A hardened version of OpenShift with licenses for ISVs and vendors.
What Are the Advantages of OpenShift?
In addition to offering a consistent and powerful developer experience in a complete package, OpenShift is a certified Kubernetes provider and compliant with several industry standards. No matter which environment you choose to use on-premises, in the public cloud, or both-OpenShift provides a seamless way for your development team to build, test, deploy, and operate their applications.