NICE Senior Devops Engineer Interview Questions and Answers

Q1. Deep dive into all DevOps tools
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Q1. If i delete an instance on the console and then i deploy the same instance terraform template how will terraform behave?
Ans. 
Terraform will recreate the instance as per the template
• Terraform will detect that the instance is missing and recreate it based on the template

• The new instance will have the same configuration as defined in the template

• Any changes made to the instance outside of Terraform will be lost
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Q2. If i have an instance configuration terraform template, and i manually add an ebs to it through console and then give terraform apply how will terraform behave?
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Q3. What will be the IP range if i need 500 IPs?
Ans. 
The IP range for 500 IPs would typically be a /23 subnet.
• For 500 IPs, you would need at least a /23 subnet.

• A /23 subnet provides 512 IP addresses (2^9 = 512), with 510 usable IPs after subtracting network and broadcast addresses.

• The IP range for a /23 subnet would be from x.x.x.0 to x.x.x.255.
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Q4. Python coding on string manipulation
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Q5. What are the health checks after creating instances - 2/2? What do they mean?
Ans. 
Health checks after creating instances ensure the instances are functioning properly.
• Instance status checks ensure the instance is reachable and responding to traffic.

• System status checks ensure the underlying hardware is functioning properly.

• Example: If an instance fails the system status check, it may indicate a problem with the underlying host hardware.
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Q6. How to deploy microservices?
Ans. 
Microservices can be deployed using containerization tools like Docker and orchestration tools like Kubernetes.
• Use containerization tools like Docker to package each microservice along with its dependencies into a container image.

• Leverage orchestration tools like Kubernetes to manage and deploy multiple microservices across a cluster of machines.

• Implement continuous integration and continuous deployment (CI/CD) pipelin...read more
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Q7. Write terraform code to launch an ec2 instance in a vpc and attach a role to it
Ans. 
Launch an EC2 instance in a VPC and attach a role using Terraform
• Define a VPC resource in Terraform

• Define a subnet resource within the VPC

• Create a security group for the EC2 instance

• Define an IAM role for the EC2 instance

• Launch an EC2 instance within the subnet and attach the IAM role
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Q1. Day to day activities
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Q2. Why do you learn various technologies?
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Q3. How will it be beneficial for you to learn various technologies because you will be working with limited technologies?
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Q4. Your project workflow, and how do you manage your tasks
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Q1. Explain k8s architecture
Ans. 
Kubernetes (k8s) architecture is a container orchestration platform that manages containerized applications across a cluster of nodes.
• Master Node: Controls the cluster and schedules workloads

• Worker Nodes: Run containers and communicate with the master node

• etcd: Key-value store for cluster data

• API Server: Frontend for Kubernetes control plane

• Controller Manager: Monitors cluster state and makes changes as needed

• Scheduler...read more
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Q2. Containerisation
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Q1. Write a docker file
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A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.
• Start with a base image

• Use the RUN command to execute commands in the container

• Use the COPY command to add files from the host machine to the container

• Use the CMD command to specify the command to run when the container starts
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Q2. Explain the concept of monitoring
Ans. 
Monitoring is the process of observing and tracking the performance and health of systems, applications, and infrastructure.
• Monitoring involves collecting data on various metrics such as CPU usage, memory usage, network traffic, and response times.

• It helps in identifying issues, predicting failures, and optimizing performance.

• Monitoring tools like Nagios, Prometheus, and Grafana are commonly used in DevOps for real-tim...read more
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Overall ok It was 30 min duration

Testing you general IQ with aptitude exam along with java MCQ exams

Discussed about the projects done during engineering

Q1. K8s fundamentals. Role of each component
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Q2. How can one troubleshoot the crashloop error in Kubernetes (k8s)?
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1. Log parsing using python

Q1. What are inodes?
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Q2. How do you list all the files held by a process
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Q3. Container vs Virtaul Machines?
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DSA, Hashmaps, Arrays and String Manipulation

Q1. What are terraform modules
Ans. 
Terraform modules are reusable components that can be used to create infrastructure resources.
• Modules are collections of .tf files that define resources and their dependencies

• They can be used to create reusable infrastructure code

• Modules can be published to the Terraform Registry for others to use

• They can be used to create complex infrastructure setups easily
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