HCLTech Senior Devops Engineer Interview Questions and Answers

CI/CD is a software development practice where code changes are automatically built, tested, and deployed.

• Continuous Integration (CI) involves automatically building and testing code changes frequently.

• Continuous Deployment (CD) involves automatically deploying code changes to production.

• Jenkins is a popular open-source automation server used for CI/CD pipelines.

• Jenkins pipelines are defined using a Jenkinsfile which s...read more

Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications.

• Kubernetes follows a master-slave architecture with a master node controlling multiple worker nodes.

• Master node components include API server, scheduler, controller manager, and etcd.

• Worker node components include kubelet, kube-proxy, and container runtime (e.g. Docker).

• Kubernet...read more

grep and egrep are command line tools used for searching text patterns in files in Linux.

• grep is a basic command line tool for searching text patterns in files.

• egrep is an extended version of grep with support for regular expressions.

• grep is case-sensitive by default, use -i flag for case-insensitive search.

• egrep supports extended regular expressions without escaping special characters.

• Example: grep 'pattern' file.txt

• E

Use awk command to print the fourth column of a file

• Use awk command with '{print $4}' to print the fourth column of a file

• Example: awk '{print $4}' file.txt

Ingress is a Kubernetes resource that manages external access to services, and a sidecar container is a secondary container that runs alongside the main container in a pod.

• Ingress is a Kubernetes resource that acts as an API gateway for incoming traffic to services within the cluster.

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

• Sidecar containers are additional contai...read more

Services in k8s are abstractions that define a set of pods and a policy for accessing them.

• Services allow communication between different parts of an application within a Kubernetes cluster.

• They provide a stable endpoint for accessing a set of pods, even if the pods are scaled up or down.

• Services can be of different types such as ClusterIP, NodePort, LoadBalancer, and ExternalName.

• ClusterIP services expose the service ...read more

ext is the default file system for many Linux distributions, while xfs is known for better performance and scalability.

• ext is the default file system for many Linux distributions

• xfs is known for better performance and scalability

• xfs supports larger file systems and files compared to ext

CentOS/RHEL 6 & 7 differ in kernel version, package management, systemd, and support lifecycle.

• Kernel version: CentOS/RHEL 6 uses kernel version 2.6.x while CentOS/RHEL 7 uses kernel version 3.x.

• Package management: CentOS/RHEL 6 uses yum for package management, while CentOS/RHEL 7 uses yum and dnf.

• Systemd: CentOS/RHEL 6 uses SysV init system, while CentOS/RHEL 7 uses systemd as the init system.

• Support lifecycle: CentOS...read more