OpenShift Interview Questions

1.      What is OpenShift?

Ans: OpenShift is a container orchestration platform developed by Red Hat. It is based on Kubernetes and provides additional features such as built-in CI/CD, security and networking. It allows developers to easily build, deploy, and scale containerized applications in a variety of environments.

2.      What are the key features of OpenShift?

Ans: Some of the key features of OpenShift include:

·        Container orchestration: OpenShift uses Kubernetes to manage and scale containerized applications.

·        Built-in CI/CD: OpenShift provides a built-in pipeline for continuous integration and continuous deployment.

·        Security: OpenShift provides built-in security features such as role-based access control and network policy enforcement.

·        Networking: OpenShift provides built-in networking features such as service discovery and load balancing.

·        Developer experience: OpenShift provides a web console and command-line tools to make it easy for developers to build, deploy, and manage applications.

3.      How does OpenShift handle scaling?

Ans: OpenShift uses Kubernetes to handle scaling of containerized applications. It allows you to specify the desired number of replicas for a deployment and automatically adjusts the number of replicas to meet that desired state. OpenShift also provides the ability to automatically scale based on metrics such as CPU and memory usage.

4.      How does OpenShift handle networking?

Ans: OpenShift uses Kubernetes to handle networking. It provides a built-in service discovery feature that allows containers to discover and communicate with each other. It also provides built-in load balancing and support for custom network policies.

5.      How does OpenShift handle security?

Ans: OpenShift provides built-in security features such as role-based access control and network policy enforcement. It also allows you to configure and manage security contexts for pods, services and projects. It also integrates with various security solutions such as SELinux, Security-Enhanced Linux, to secure the containerized applications.

6.      How does OpenShift handle storage?

Ans: OpenShift uses Kubernetes to handle storage. It provides support for various types of storage such as local storage, network storage, and cloud storage. OpenShift also provides persistent volumes and persistent volume claims to manage the storage of data that needs to persist even after the pod is deleted.

7.      How does OpenShift handle deployments?

Ans: OpenShift uses Kubernetes to handle deployments. It provides a deployment configuration file, which can be used to specify the desired state of a deployment, such as the number of replicas and update strategy. The OpenShift web console and command-line tools can be used to create, manage, and update deployments.

8.      How does OpenShift handle resource management?

Ans: OpenShift uses Kubernetes to handle resource management. It allows you to specify resource limits and requests for pods and containers, and will automatically schedule them on available resources. OpenShift also allows you to set quotas to limit the amount of resources that a project can use.

9.      How does OpenShift handle service discovery?

Ans: OpenShift uses Kubernetes to handle service discovery. It provides a built-in service discovery feature that allows containers to discover and communicate with each other. Services in OpenShift are automatically assigned an IP address and DNS name, and can be accessed from other pods and services in the same project.

10.   How does OpenShift handle monitoring and logging?

Ans: OpenShift provides built-in monitoring and logging features, such as the ability to collect and view container logs and metrics. It also allows you to integrate with external monitoring and logging solutions such as Prometheus and Elasticsearch.

11.   How does OpenShift handle CI/CD?

Ans: OpenShift provides a built-in pipeline for continuous integration and continuous deployment. It allows you to configure and manage build, test, and deployment stages using the web console and command-line tools. It also supports integration with external CI/CD tools such as Jenkins and GitHub Actions.

12.   How does OpenShift handle security and compliance?

Ans: OpenShift provides built-in security features such as role-based access control, network policy enforcement and security contexts for pods, services and projects. It also integrates with various security solutions such as SELinux, Security-Enhanced Linux, to secure the containerized applications. OpenShift is also compliant with various industry standards like SOC2, PCI-DSS, and HIPAA.

13.   How does OpenShift handle rolling updates?

Ans: OpenShift uses Kubernetes to handle rolling updates. It allows you to specify the desired number of replicas for a deployment and automatically adjusts the number of replicas to meet that desired state. OpenShift also provides the ability to perform rolling updates with zero downtime, by gradually updating the replicas of a deployment one at a time.

14.   How does OpenShift handle load balancing?

Ans: OpenShift uses Kubernetes to handle load balancing. It provides built-in load balancing for services, which automatically distributes traffic across the available replicas of a deployment. It also allows you to configure custom load balancers using Ingress resources.

15.   How does OpenShift handle Blue-Green Deployment?

Ans: OpenShift supports Blue-Green Deployment, which is a technique for rolling out updates to a service with zero downtime by running two identical production environments called Blue and Green. OpenShift allows you to create multiple versions of the same deployment and route traffic to different versions. This allows for easy rollback if there is any issue with the new version.

16.   How does OpenShift handle canary deployments?

Ans: OpenShift supports Canary Deployment, which is a technique for rolling out updates to a service by gradually exposing the new version to a small subset of users before releasing it to the entire user base. OpenShift allows you to create multiple versions of the same deployment and route a percentage of traffic to different versions. This allows for testing the new version

17.   How does OpenShift handle multi-tenancy?

Ans: OpenShift provides support for multi-tenancy through the use of projects and namespaces. Projects are the highest level of organization in OpenShift and are used to group resources and provide access control. Namespaces are a lower level of organization and are used to group resources within a project. This allows for multiple teams or customers to share the same OpenShift cluster while keeping their resources separate.

18.   How does OpenShift handle image management?

Ans: OpenShift uses Kubernetes to handle image management. It provides a built-in image registry called OpenShift Container Registry (OCR), which allows you to store and distribute images within your organization. It also allows you to integrate with external image registries such as Docker Hub and Quay.

19.   How does OpenShift handle secrets and configmaps?

Ans: OpenShift uses Kubernetes to handle secrets and configmaps. Secrets are used to store sensitive information such as passwords and tokens, while configmaps are used to store configuration data. Both secrets and configmaps can be created and managed using the OpenShift web console and command-line tools. They can also be referenced in a deployment configuration file to be passed to the containers as environment variables or mounted as files.

20.   How does OpenShift handle autoscaling?

Ans: OpenShift uses Kubernetes to handle autoscaling. It allows you to configure autoscaling for deployments and stateful sets based on metrics such as CPU and memory usage. It also supports the use of horizontal pod autoscaling (HPA) and vertical pod autoscaling (VPA) to automatically scale the number of pods in a deployment based on resource usage.

21.   How does OpenShift handle service meshes?

Ans: OpenShift supports service meshes through the use of Istio and Envoy. Service meshes provide features such as traffic management, service discovery, and security for microservices. OpenShift allows you to easily deploy and configure Istio or Envoy as a service mesh, and manage its configuration using the OpenShift web console and command-line tools.

22.   How does OpenShift handle self-service provisioning?

Ans: OpenShift provides self-service provisioning through the use of templates and the OpenShift web console. Templates are pre-defined configurations for resources such as deployments, services, and storage. Users can use the web console to create new resources based on templates and configure them as needed. This allows developers to easily provision and manage their own resources, without needing to rely on a central IT team.

23.   How does OpenShift handle rollbacks?

Ans: OpenShift allows you to roll back a deployment to a previous version, either manually or automatically. You can use the OpenShift web console or command-line tools to view the revision history of a deployment and roll back to a specific version. You can also configure automatic rollbacks based on specific conditions, such as a failed health check.

24.   How does OpenShift handle disaster recovery?

Ans: OpenShift provides disaster recovery through the use of replication controllers and self-healing features. Replication controllers ensure that the desired number of replicas of a deployment are running at all times, and will automatically create new replicas if any are deleted or terminated. OpenShift also provides the ability to configure automatic failover for stateful sets and other resources.

25.   How does OpenShift handle security and compliance?

Ans: OpenShift provides built-in security features such as role-based access control, network policy enforcement and security contexts for pods, services and projects. It also integrates with various security solutions such as SELinux, Security-Enhanced Linux, to secure the containerized applications. OpenShift is also compliant with various industry standards like SOC2, PCI-DSS, and HIPAA.