Welcome to “Introduction to Red Hat OpenShift.” After watching this video, you will be able to explain what OpenShift is and list its features. Describe OpenShift CLI, architecture, and components. And compare OpenShift with Kubernetes. OpenShift® (developed and supported by Red Hat®) is an enterprise-ready Kubernetes container platform built for the hybrid cloud strategy. It provides a consistent application platform to manage hybrid, multicloud, and edge deployments. It is built on the technological foundation of Linux®, containers, and automation. It provides full-stack automated operations and self-service provisioning for developers to efficiently move ideas from development to production. And besides container orchestration, it provides additional tooling around the complete lifecycle of applications, from build, to CI/CD, to monitoring and logs. Both Kubernetes and OpenShift are container orchestration platforms. Kubernetes is a critical component of OpenShift. OpenShift is used as an extension of Kubernetes to provide a more robust and comprehensive platform for containerized applications. Let’s review the features of OpenShift: Apps can scale to thousands of instances across hundreds of nodes in seconds. Flexible hybrid infrastructure options simplify deployment and management. Open source standards use Kubernetes and Open Container Initiative (OCI) containers, which means development is familiar and containers are portable across multiple environments. It includes a comprehensive set of developer tools, multilanguage support, command line, IDE integrations, and more. It supports Over-air platform upgrades, and services from the OperatorHub can be fully configured and deployed with one-click upgrades. Container and app builds, deployments, scaling, and health management, are streamlined and automated. OpenShift also, enhances support for smaller-footprint topologies in edge scenarios for better mapping, connectivity, and availability. It easily manages and enforces policies across multiple clusters at scale. It offers access controls, networking and enterprise registry, built-in scanner, enhanced threat detection, lifecycle vulnerability management, and risk profiling. OpenShift supports enterprise persistent storage solutions for running stateful and stateless apps. And, the OpenShift partner ecosystem provides additional storage and network services, as well as IDE, CI, integrations, and more. Let us compare the main aspects between OpenShift and Kubernetes. OpenShift is a product while Kubernetes is an open-source project. Installation on OpenShift has limited options after the installation starts while Kubernetes is installable on every Linux environment. OpenShift is less flexible while Kubernetes is more flexible. OpenShift is available online, with Azure, and dedicated while Kubernetes is available on EKS on AWS, GKE on GCP, and AKS on Azure. OpenShift image streams provide better management while Kubernetes container image management is not easy. OpenShift has a very strict security policy while Kubernetes security maintenance is easy. OpenShift router objects permit external access while Kubernetes ingress objects permit external access to Kubernetes clusters. OpenShift uses the less flexible DeploymentConfig command, while Kubernetes uses more flexible deployment objects. OpenShift provides a good user experience while Kubernetes requires extra tools for a better user experience. OpenShift provides good networking solutions out of the box while Kubernetes provides third-party plugins when networking solutions are unavailable. OpenShift provides a good service catalog while Kubernetes offers less provision for better services in clusters. OpenShift has a user-friendly web console layout that is easy to learn for beginners while Kubernetes’ console layout is difficult to learn for beginners. The OpenShift CI and CD integrate with Jenkins, while the Kubernetes CI and CD can be integrated, but not with Jenkins. OpenShift runs on top of a Kubernetes cluster, with object data stored in the etcd key-value store. It has a microservices-based architecture. Its services are: REST APIs, which expose the core objects. And controllers, which read the REST APIs, apply changes to the other objects, and report status or write back to the object. They also maintain the cluster desired state. Docker provides abstraction for packaging and creating Linux-based, lightweight container images. Kubernetes provides cluster management and orchestrates containers on multiple hosts. OpenShift features add: Management of source code, builds, and deployments for developers. Managing and promoting images at scale as they flow through your system. Application management at scale. Team and user tracking management of a large developer organization. And networking infrastructure that supports the cluster. In an OpenShift environment, the Kubernetes master runs on Red Hat Enterprise Linux CoreOS, while worker nodes support Red Hat Enterprise Linux; that is the Red Hat base layer. Next is the Kubernetes architecture and a set of services. Cluster services include integrated monitoring, a private registry within the cluster, networking solutions, and many others. Platform services help users manage their workloads. Application services help users build cloud-native apps. And developer services increase developer productivity. OpenShift offers a set of command line interface (or CLI) tools that lets users perform various admin and development operations from the terminal. OpenShift CLI (or oc): is the most commonly used CLI tool to perform end-to-end operations. It runs on Windows, Linux, or Mac. oc lets you: Work directly with project source code using command script. Script OpenShift operations. And manage projects during restricted bandwidth or availability of the web console. Since OpenShift runs on top of a Kubernetes cluster, a copy of kubectl is also included with oc. The oc and kubectl binary offer the same capabilities, but oc is further extended to natively support OpenShift features, such as: DeploymentConfigs, BuildConfigs, Routes, ImageStreams and ImageStreamTags. These are not available in standard Kubernetes. oc also offers an in-built log-in command for authentication. And additional commands like ‘new-app’ are also supported by oc, which makes it easier to get new applications started using existing source code or prebuilt images. In this video, you learned that: Kubernetes and OpenShift are container orchestration platforms. OpenShift® is an enterprise-ready Kubernetes container platform built for open hybrid cloud. OpenShift runs on a Kubernetes cluster, with object data stored in the etcd key-value store. And, OpenShift is easier to use, integrates with Jenkins, and has more services and features.
