Maharashtra Seamless Interview Questions and Answers

Various Linux commands are essential for a DevOps Engineer's daily tasks.

• ls - list directory contents

• cd - change directory

• pwd - print working directory

• grep - search for patterns in files

• chmod - change file permissions

• tar - archive files

• ssh - secure shell for remote access

• ps - display information about running processes

• top - display and update sorted information about processes

• find - search for files in a directory hierarchy

DNS in Kubernetes is used to resolve domain names to IP addresses for services running in the cluster.

• Kubernetes uses CoreDNS as the default DNS server for service discovery within the cluster.

• Each service in Kubernetes gets a DNS name in the format <service-name>.<namespace>.svc.cluster.local.

• Pods can resolve DNS names of other services within the cluster using the built-in DNS resolution mechanism.

• External DNS services can be used to resolve external domain names to IP addr...read more

Different types of services include web services, cloud services, and microservices.

• Web services: Services that are accessed over the internet using standard protocols like HTTP.

• Cloud services: Services provided by cloud computing providers, such as AWS, Azure, and Google Cloud.

• Microservices: Architectural style where an application is composed of small, independent services that communicate over APIs.

Kubevirt is a Kubernetes extension that allows running virtual machines alongside containers.

• Kubevirt extends Kubernetes to support virtual machines as first-class citizens.

• It enables users to manage VMs using kubectl commands.

• Kubevirt uses Kubernetes resources like Pods and Services to manage VMs.

• It provides a way to define VMs using YAML manifests.

• Users can create and run VMs using Kubevirt in a Kubernetes cluster.

Ingress is a Kubernetes resource that manages external access to services within a cluster.

• Ingress routes external traffic to services based on rules defined in the Ingress resource.

• Ingress controllers are responsible for implementing the rules set in the Ingress resource.

• Ingress can provide features like SSL termination, load balancing, and path-based routing.

• Ingress resources typically include rules for hostnames, paths, and backend services.

• Examples of Ingress controllers ...read more

Queues are data structures that follow the First In First Out (FIFO) principle. Different types include linear queues, circular queues, and priority queues.

• Linear queues: Elements are added at the rear and removed from the front.

• Circular queues: Elements are added and removed in a circular manner.

• Priority queues: Elements are removed based on priority levels assigned to them.

To build a real-time progress bar, use JavaScript setInterval to update the progress continuously.

• Use HTML/CSS to create the progress bar UI.

• Use JavaScript setInterval function to update the progress bar at regular intervals.

• Calculate the progress percentage based on the current progress and total progress.

• Update the progress bar width/style dynamically based on the calculated percentage.