Openshift Interview Questions for Freshers/Openshift Interview Questions and Answers for Freshers & Experienced

What do you mean by canary deployment?

In OpenShift Origin, All rolling deployments are the canary deployments; and a new version is tested prior to all old instances being replaced. If the readiness check is not successful, the canary instance will be removed, and the deployment will proceed.

Posted Date:- 2021-11-09 07:09:49

Name the network plugin for providing connectivity for pods across an entire cluster.

The network plugin that provides connectivity for pods across the entire cluster without any limitations is ‘ovs-subnet.’

Posted Date:- 2021-11-09 07:09:00

Which projects can claim a Persistent Volume (PV) object?

Candidates could also find some tough questions like this in OpenShift interviews. The answer suggests indications towards default projects, OpenShift projects, any project, and OpenShift-infra projects.

Posted Date:- 2021-11-09 07:07:36

Explain OpenShift Architecture?

The identity providers in OAUTH are HTTPassword, LDAP, Allow All, Deny All, and Authentication.

Posted Date:- 2021-11-09 07:06:53

What are Build configurations?

Build configuration resources help in configuration and control of builds. Build configuration includes details about a specific build strategy and the source of developer-supplied artifacts like output image.

Posted Date:- 2021-11-09 07:05:58

What is the difference between OpenShift and OpenStack?

Candidates can find this question among crucial OpenShift interview questions. The primary difference is that OpenStack provides Infrastructure as a Service (IaaS). Furthermore, OpenStack is different from OpenShift by providing object storage and block storage to a bootable virtual machine.

Posted Date:- 2021-11-09 07:05:06

Why do we need DevOps tools?

The applications of DevOps tools are ideal for improving flexibility in software delivery. In addition to this, DevOps tools also help in improving deployment frequency and reducing failure rates. Furthermore, DevOps tools also help in faster recovery and better time management between repairs.

Posted Date:- 2021-11-09 07:04:22

What is Image Version Tag Policy?

Rather than version numbers, the Docker service allows applying tags (such as v1, v2.1, GA, or the default latest) in addition to the image name to further specify the image desired, so you may see the same image referred to as centos (implying the latest tag), centos:centos7, or fd44297e2ddb.

Posted Date:- 2021-11-09 07:03:06

What are Init Containers?

A pod can have init containers in addition to application containers. Init containers allow you to reorganize setup scripts and binding code. An init container differs from a regular container in that it always runs to completion. Each init container must complete successfully before the next one is started.

Posted Date:- 2021-11-09 07:02:31

What are Nodes?

Nodes – A node provides the runtime environments for containers. Each node in a Kubernetes cluster has the required services to be managed by the master. Nodes also have the required services to run pods, including the Docker service, a kubelet, and a service proxy.

Posted Date:- 2021-11-09 07:00:57

What are Masters?

The master is the host or hosts that contain the master components, including the API server, controller manager server, and etcd. The master manages nodes in its Kubernetes cluster and schedules pods to run on nodes.

Posted Date:- 2021-11-09 06:59:58

How OpenShift uses Docker and Kubernetes?

Kubernetes and Docker could work OpenShift in the form of a control system. You can find this question among the latest OpenShift interview questions commonly. The control system helps in enabling many deployment pipelines that are ideal for later use in auto-scaling, testing, and other processes.

Posted Date:- 2021-11-09 06:59:06

What is the difference between gear and container?

You can find the latest OpenShift interview questions focused on difference-based evaluations. The terms ‘container’ and ‘gear’ are interchangeable. Containers have a precise mapping involving one-to-one relations among images. However, in the case of gears, many cartridges can become part of a single gear. In the case of containers, pods fulfill the collocation concept.

Posted Date:- 2021-11-09 06:56:26

What are benefits of Cloud Computing?

* Elastic resources: Scale up or down quickly and easily to meet a demand.
* Self-service: All the required IT resources with selfservice access.
* Metered service: You only pay for what you use.

Posted Date:- 2021-11-09 06:55:49

Do you know about OpenShift cartridges?

OpenShift cartridges have also popped up as an important OpenShift interview question. OpenShift cartridges are central points for developing applications. Every cartridge has specific libraries, build mechanisms, source code, routing logic, and connection logic alongside pre-configured environment. All these factors help in running your application.

Posted Date:- 2021-11-09 06:54:44

Outline the benefits of OpenShift Origin.

The benefits of OpenShift Origin may come up among the best OpenShift interview questions. The benefits include running PaaS locally on a system and behind a firewall. OpenShift Origin also helps in improving developer competences with PaaS and the expansion of skills.

Posted Date:- 2021-11-09 06:53:10

What type of security controls can you find on OpenShift?

OpenShift interview questions would also revolve around security concerns. The security policy of OpenShift follows certain precedents. Containers could not access host resources or run privileged. Containers have to run as non-root unique users separate from other users. Containers get CPU and memory limits according to definitions by the system administrator. Most important of all, regular users and admins could not change security quotas.

Posted Date:- 2021-11-09 06:52:32

What the systems on the OpenShift environment running on AWS?

The OpenShift environment running on Amazon Web Services includes one master node and one infrastructure node. It also includes an NFS server and 24 application nodes.

Posted Date:- 2021-11-09 06:49:01

What are the feature toggles?

Feature toggles are also frequent entries among OpenShift interview questions. These are techniques that help in including old and new versions of a feature in the same code base. However, the versions are surrounded by logic for execution or based on factors such as database switch or property value. Feature toggles help in separating the deployment from usage, single group, and legacy systems, and multiple server groups.

Posted Date:- 2021-11-09 06:48:28

Define the OpenShift CLI.

Candidates should note the importance of CLI to form an OpenShift interview question. OpenShift CLI is a tool for the management of OpenShift applications from the command line. The OpenShift CLI provides abilities for the management of the end-to-end application lifecycle. It has the features for basic and advanced configuration for applications. Also, it includes functionalities for management, deployment, and adding applications.

Posted Date:- 2021-11-09 06:48:00

What is the Downward API in OpenShift?

Candidates could find this entry among frequently asked OpenShift interview questions. Downward API is a mechanism for pods to retrieve metadata without the need to call into Kubernetes API. Downward API is ideal for retrieving metadata and configuration of running pods.

The metadata which Downward API can retrieve include labels, annotations, pod name, namespace, and IP address. Downward API can also retrieve information about Pod CPU or memory requests and limits. Downward API may mount certain information on the pod as an environment variable. On the other hand, certain information could also be accessed as files within a volume.

Posted Date:- 2021-11-09 06:47:29

What Is the OpenShift Origin Architecture?

OpenShift Origin has a microservices-based architecture of smaller, decoupled units that work together. It runs on top of a Kubernetes cluster, with data about the objects stored in etcd, a reliable clustered key-value store. Those services are broken down by function:

REST APIs, which expose each of the core objects.

Posted Date:- 2021-11-09 06:46:55

What Are the Layers in OpenShift?

The Docker service provides the abstraction for packaging and creating Linux-based, lightweight container images. Kubernetes provides the cluster management and orchestrates containers on multiple hosts.

OpenShift Origin adds:

* Source code management, 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 for organizing a large developer organization
* Networking infrastructure that supports the cluster

Posted Date:- 2021-11-09 06:46:29

What are rolling deployments?

Candidates can find this question as a follow-up to the previous mention in this list of OpenShift interview questions. Rolling deployments involve the slow replacement of instances of the old version of an application by instances of a new version of the application. Rolling deployment depends on the readiness check for new pods before scaling down capacities of old components. In the case of significant issues, rolling deployment could be stalled.

Posted Date:- 2021-11-09 06:45:48

What are deployment strategies?

Deployment strategies are an important part of top OpenShift interview questions. Deployment strategies are instruments for modifying or upgrading an application. With the help of deployment strategies, modifications do not require any form of downtime. The most common deployment strategy is the blue-green deployment strategy.

In this strategy, users keep using the stable version denoted by green while changes are made in the new version denoted by blue. After testing and evaluating the new version in blue color, users can switch to the blue version. If any problem arises, then users could continue with the green version.

Posted Date:- 2021-11-09 06:45:04

What are the features of OpenShift v3?

OpenShift v3 is a layered system designed to expose underlying Docker-formatted container image and Kubernetes concepts as accurately as possible, with a focus on easy composition of applications by a developer. For example, install Ruby, push code, and add MySQL.

Posted Date:- 2021-11-09 06:39:28

What is Master vs Broker?

Masters in OpenShift v3 do the job of the broker layer in OpenShift v2. However, the MongoDB and ActiveMQ layers used by the broker in OpenShift v2 are no longer necessary because the key-value store etcd is typically installed with each master.

Posted Date:- 2021-11-09 06:38:46

What is Gear vs Container?

The gear and container terms are interchangeable. Containers have a cleaner mapping of being one-to-one with images, whereas many cartridges could be added to a single gear. With containers, the collocation concept is satisfied by pods.

Posted Date:- 2021-11-09 06:36:54

What is Project vs Domain?

The project is essentially a rename of the domain from OpenShift v2. Projects do have several features that are not a part of domains in OpenShift v2.

Posted Date:- 2021-11-09 06:36:30

What is Cartridge vs Image?

The easiest replacement term for the cartridge in OpenShift v3 is the image. An image does more than a cartridge from a packaging perspective, providing better encapsulation and flexibility.

But the cartridge concept also included logic for building, deploying, and routing which do not exist in images. In OpenShift v3, these additional needs are met by Source-to-Image (S2I) and templated configuration.

Posted Date:- 2021-11-09 06:36:06

What is OpenShift Cartridges?

Cartridges in OpenShift were the focal point for building applications. Each cartridge provided the required libraries, source code, build mechanisms, connection logic, and routing logic along with a pre-configured environment to run the components of your applications.

Posted Date:- 2021-11-09 06:35:42

What are the new features introduced in OpenShift Container Platform 3.7?

OpenShift Container Platform 3.7 significantly expands how we integrate third-party services for our customers, both on-premises and in the cloud. It includes:

The general availability of OpenShift Service Catalog, which includes a new user experience to make it easier for developers to find the runtimes, frameworks, and services they need to be productive.

Access to AWS through the OpenShift platform In OCP 3.7, AWS and OpenShift users will be able to configure and deploy AWS services from within the OpenShift platform, with a single path for support.

Posted Date:- 2021-11-09 06:35:17

What are the benefits of OpenShift Origin?

The benefits available to the developer are numerous:

* Run a PaaS locally on your laptop.
* Run a PaaS behind your firewall.
* Become a developer on a PaaS and expand your skills and solve interesting technical problems.
* Integrate your middleware or framework into an open source PaaS.
* Create a new thing based on PaaS technology.
* By utilizing an open source IaaS codebase, build a cloud stack using open source.

Posted Date:- 2021-11-09 06:34:54

What is Source-to-Image (S2I)?

Source-to-Image (S2I) is a toolkit and workflow for building reproducible Docker images from source code. S2I produces ready-to-run images by injecting source code into a Docker container and letting the container prepare that source code for execution.

By creating self-assembling builder images, you can version and control your build environments exactly like you use Docker images to version your runtime environments.

Posted Date:- 2021-11-09 06:33:31

What are the security controls does OpenShift provide for containers?

OpenShift runs with the following security policy by default:

* Containers run as a non-root unique user that is separate from other system users
* They cannot access host resources, run privileged, or become root
* They are given CPU and memory limits defined by the system administrator
* Any persistent storage they access will be under a unique SELinux label, which prevents others from seeing their content
* These settings are per project, so containers in different projects cannot see each other by default
* Regular users can run Docker, source, and custom builds
* By default, Docker builds can (and often do) run as root. You can control who can create Docker builds through the builds/docker and builds/custom policy resource.
* Regular users and project admins cannot change their security quotas.

Posted Date:- 2021-11-09 06:32:15

What can you run on OpenShift?

OpenShift is designed to run any existing Docker images. Additionally, you can define builds that will produce new Docker images using a Dockerfile.

For an easier experience running your source code, Source-to-Image (S2I) allows developers to simply provide an application source repository containing code to build and run. It works by combining an existing S2I-enabled Docker image with application source to produce a new runnable image for your application.

Posted Date:- 2021-11-09 06:29:13

What is OpenShift Origin?

OpenShift Origin is a distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OpenShift adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams.

Posted Date:- 2021-11-09 06:27:17

What is OpenShift Origin?

OpenShift Origin is a distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OpenShift adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams.

Posted Date:- 2021-11-09 06:26:15

What is OpenShift Origin?

OpenShift Origin is a distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OpenShift adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams.

Posted Date:- 2021-11-09 06:25:55

What are Pods in OpenShift?

In OpenShift, the smallest deployable unit is a Pod. A Pod is a group of one or more Docker containers deployed together and guaranteed to be on the same host.

Pods can contain multiple Docker instances. The general idea is for a Pod to contain a “server” and any auxiliary services you want to run along with that server. Examples of containers you might put in a Pod are, an Apache HTTPD server, a log analyzer, and a file service to help manage uploaded files.

Posted Date:- 2021-11-09 06:23:20

What is OpenShift Web Console?

OpenShift also provides a feature-rich Web Console that provides a friendly graphical interface for interacting with the platform.

Posted Date:- 2021-11-09 06:22:52

What is OpenShift CLI?

OpenShift ships with a feature rich web console as well as command line tools to provide users with a nice interface to work with applications deployed to the platform. The OpenShift tools are a single executable written in the Go programming language and is available for the following operating systems:

* Microsoft Windows
* Apple OS X
* Linux
* This lab manual
* The OpenShift Docker registry
* The OpenShift router
* Etherpad

Posted Date:- 2021-11-09 06:12:06

The infrastructure node is providing which services?

The infrastructure node is providing several services:

* Aggregated logging
* Cluster metrics
* GitLab

Posted Date:- 2021-11-09 06:09:49

OpenShift environment that is running on Amazon Web Services consists of which systems?

When interacting with an OpenShift environment that is running on Amazon Web Services. The environment consists of the following systems:

* 1 master nodes
* 1 infrastructure nodes
* 24 “application” nodes
* An NFS server

Posted Date:- 2021-11-09 06:09:02

What is OpenShift Container Platform?

OpenShift Container Platform is Red Hat’s on-premises private platform as a service product, built around a core of application containers powered by Docker, with orchestration and management provided by Kubernetes, on a foundation of Red Hat Enterprise Linux.

Posted Date:- 2021-11-09 06:08:08

What is OpenShift Dedicated?

OpenShift Dedicated is Red Hat’s managed private cluster offering, built around a core of application containers powered by Docker, with orchestration and management provided by Kubernetes, on a foundation of Red Hat Enterprise Linux. It’s available on the Amazon Web Services (AWS) and Google Cloud Platform (GCP) marketplaces.

Posted Date:- 2021-11-09 06:07:45

How OpenShift works with Docker and Kubernetes?

OpenShift combines the power of Docker and Kubernetes with an enterprise-ready control system. It enables you to create a Continues Deployment Pipeline with all you need from testing to autoscaling.

Posted Date:- 2021-11-09 06:07:25

What is Gear in OpenShift?

OpenShift called these isolated clusters "gears."In an abstract sense, the work that gears produced was called the "application." Rather than a branded piece of software, an application was a job performed by gears. A construct made up of reusable gears that other gears might need, was called a cartridge.

Posted Date:- 2021-11-09 06:06:44

What is Container in OpenShift?

OpenShift is a computer software product from Red Hat for container-based software deployment and management. It is a supported distribution of Kubernetes using Docker containers and DevOps tools for accelerated application development.

Posted Date:- 2021-11-09 06:06:25

How are Pods in OpenShift?

Pods are the rough equivalent of a machine instance (physical or virtual) to a container. Each pod is allocated its own internal IP address, therefore owning its entire port space, and containers within pods can share their local storage and networking. OpenShift leverages the Kubernetes concept of a pod , which is one or more containers deployed together on one host, and the smallest compute unit that can be defined, deployed, and managed. OpenShift treats pods as largely immutable; changes cannot be made to a pod definition while it is running.

Posted Date:- 2021-11-09 06:05:06

Explain difference between Openshift and Openstack?

Both OpenStack and OpenShift Origin are open source projects, and both provide cloud computing foundations. However, they do not compete with each other. OpenStack provides "Infrastructure-as-a-Service", or "IaaS". It provides bootable virtual machines, networking, block storage, object storage, and so forth.

Posted Date:- 2021-11-09 06:04:41

What is OpenShift?

OpenShift is a computer software product from Red Hat for container-based software deployment and management. It is a supported distribution of Kubernetes using Docker containers and DevOps tools for accelerated application development.

Posted Date:- 2021-11-09 06:04:21

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