KubeRox Technologies Lead DevOps Engineer Interview Questions and Answers for Experienced

DevOps process is a set of practices that combines software development (Dev) and IT operations (Ops) to shorten the systems development life cycle.

• DevOps process involves collaboration between development and operations teams.

• It focuses on automating and monitoring the process of software integration, testing, deployment, and infrastructure changes.

• Continuous integration, continuous delivery, and continuous deployment

Daily activities include monitoring system performance, troubleshooting issues, automating tasks, collaborating with team members, and implementing new technologies.

• Monitoring system performance to ensure optimal operation

• Troubleshooting issues that arise in the infrastructure

• Automating repetitive tasks to improve efficiency

• Collaborating with team members on projects and problem-solving

• Implementing new technologies to

CICD stands for Continuous Integration/Continuous Deployment. Jenkinsfile functions include stages, steps, post, and more.

• CICD stands for Continuous Integration/Continuous Deployment

• Jenkinsfile functions include stages, steps, post, agent, environment, and more

• Stages define a series of tasks to be executed in a pipeline

• Steps define individual actions within a stage

• Post defines actions to be taken after the pipeline has...read more

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

• Kubernetes helps in automating the deployment, scaling, and management of containerized applications.

• It allows for easy scaling of applications by adding or removing containers based on demand.

• Kubernetes provides features like service discovery, load balancing, and self-healing ...read more

Workspaces in Docker are isolated environments where developers can work on different projects without affecting each other.

• Workspaces allow developers to have separate environments for each project, preventing conflicts between dependencies.

• Each workspace has its own set of containers, volumes, and networks, ensuring isolation.

• Developers can easily switch between workspaces to work on different projects.

• Workspaces are...read more

Cost optimization in DevOps is achieved through efficient resource utilization, automation, and continuous monitoring.

• Implementing auto-scaling to dynamically adjust resources based on demand

• Using containerization to maximize resource utilization and reduce costs

• Leveraging cloud services for pay-as-you-go pricing model

• Implementing cost monitoring tools to identify and eliminate wasteful spending

• Optimizing code and infr...read more

Monitoring is done using Prometheus and Grafana. Prometheus collects metrics and Grafana visualizes them.

• Prometheus is an open-source monitoring and alerting toolkit

• It collects metrics from monitored targets by scraping HTTP endpoints

• Grafana is a visualization tool that creates dashboards for the collected metrics

• It allows users to create graphs, charts, and alerts based on the data from Prometheus

git fetch downloads changes from the remote repository, while git pull downloads changes and merges them into the current branch.

• git fetch only downloads changes from the remote repository, but does not merge them into the current branch

• git pull downloads changes from the remote repository and merges them into the current branch

• git fetch is useful for reviewing changes before merging, while git pull is a shortcut for f

The 'add' command is used to add files from the source directory to the destination directory in a Dockerfile, while the 'copy' command is used to copy files from the source directory to the destination directory in a Dockerfile.

• The 'add' command can also accept URLs as the source, while the 'copy' command cannot.

• The 'add' command can automatically extract compressed files, while the 'copy' command cannot.

• The 'copy' co...read more

You can connect between 2 EC2 instances by using their private IP addresses or public DNS names.

• Use private IP addresses for communication within the same VPC

• Use public DNS names for communication across different VPCs or over the internet

Connections between public and private subnets are established using a NAT gateway or a NAT instance.

• Use a NAT gateway to allow instances in a private subnet to initiate outbound traffic to the internet while preventing inbound traffic from reaching those instances.

• Alternatively, use a NAT instance with a security group that only allows inbound traffic from instances in the public subnet.

• Ensure that the route tables fo...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

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