InOrg Global Devops Engineer Interview Questions and Answers

Tell me about your experience with

Data Movement
Data processing pipelines
Java based stacks
Performance and scale

Q1. Can you explain the core components of kubernetes and their roles?
Ans. 
Kubernetes core components include Pods, Nodes, Services, Deployments, and ConfigMaps.
• Pods: Smallest deployable units in Kubernetes, can contain one or more containers.

• Nodes: Individual machines in a Kubernetes cluster where Pods are deployed.

• Services: Abstraction that defines a logical set of Pods and a policy by which to access them.

• Deployments: Manages the deployment and scaling of a set of Pods.

• ConfigMaps: Decouple...read more
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Q2. How do you scale application in kubernetes?
Ans. 
Scaling applications in Kubernetes involves horizontal scaling, using tools like HPA and cluster autoscaler.
• Use Horizontal Pod Autoscaler (HPA) to automatically adjust the number of pods based on CPU or memory usage.

• Implement Cluster Autoscaler to dynamically adjust the size of the Kubernetes cluster based on resource demands.

• Utilize Kubernetes StatefulSets for stateful applications that require scaling with stable net...read more
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Q3. What is the difference between HPA and VPA? Explain with their use-case
Ans. 
HPA is Horizontal Pod Autoscaler for scaling pods based on CPU utilization, while VPA is Vertical Pod Autoscaler for adjusting resource requests based on resource usage.
• HPA scales the number of pods in a deployment based on CPU utilization, ensuring optimal performance and resource utilization.

• VPA adjusts the resource requests of pods based on resource usage, allowing for efficient resource allocation within a cluster.

• ...read more
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Q1. What happens to the deployed workload within a kubernetes cluster in case the master goes down?
Ans. 
In case the master goes down in a Kubernetes cluster, the deployed workload continues to run as the worker nodes are still operational.
• The worker nodes in the Kubernetes cluster continue to operate and manage the deployed workload even if the master node goes down.

• The worker nodes are responsible for running the containers and maintaining the desired state of the cluster.

• The master node being down may affect the abilit...read more
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Q2. What the different functionalities of individual components of a kubernetes cluster?
Ans. 
Individual components of a Kubernetes cluster have different functionalities such as scheduling, networking, storage, and monitoring.
• Kubelet: Responsible for communication between the master node and worker nodes, managing containers on the node.

• Kube-proxy: Manages network routing for services within the cluster.

• Kube-controller-manager: Ensures that the desired state of the cluster matches the actual state.

• Etcd: Key-va...read more
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Q3. Suppose I want to schedule my pods based on limits instead of requested resources, what would I need to do?
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Basic Exam about your knowledge.

We have to speak out properly and clear with our opinion.

Q1. Questions about some Technical and level of our confidence.
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Share details of your previous job.
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Q4. Tell me about yourself.
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Q5. Why are you looking for a change?
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Q6. Why should we hire you?
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Round duration - 60 minutes
Round difficulty - Easy

First round was skype based technical interview.
You are connected through screen on the terminal and basic to advanced shell scripting is asked.
They will ask basic to advanced shell commands, some shell scripting tasks and about linux kernel.
Tips: You have to be really sure in a skype interview that you know the question being asked, as you can't take much time.

Q1. What is a process in Linux?
Ans. 
A process in Linux is an instance of a running program, identified by a unique process ID (PID) and containing information about its execution.
• A process is an executing instance of a program in Linux.

• Each process is identified by a unique process ID (PID).

• Processes can be managed using commands like ps, top, and kill.

• Processes can run in the foreground or background.

• Examples of processes include web servers, database s
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Q2. How does the Linux boot process work?
Ans. 
The Linux boot process involves several stages including BIOS, bootloader, kernel initialization, and user space initialization.
• BIOS (Basic Input/Output System) performs hardware initialization and loads the bootloader

• Bootloader (such as GRUB) loads the Linux kernel into memory and starts its execution

• Kernel initializes devices, mounts the root filesystem, and starts the init process

• Init process (systemd or SysVinit) i
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Q3. How will you monitor file changes in Linux?
Ans. 
You can monitor file changes in Linux using tools like inotifywait, auditd, or by writing custom scripts.
• Use inotifywait command to monitor file changes in real-time

• Set up auditd to track file changes and system calls

• Write custom scripts using tools like inotify or diff to monitor specific files or directories
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Q4. How can you kill all Java processes with a single command?
Ans. 
You can kill all Java processes with a single command using pkill or killall commands.
• Use pkill command followed by the process name 'java' to kill all Java processes: pkill java

• Alternatively, you can use killall command with the process name 'java' to achieve the same result: killall java
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Round duration - 60 minutes
Round difficulty - Medium

This round was also on skype.
This round was more DevOps tools oriented and language programming.
They asked me about Chef, Ansible and some other tools used for configuration management and deployment.
They ask if your familiar with AWS and other cloud services.
Also you will get to show that you can code in any scripting languages like ruby or python.
Also some database related things.
Tips: Only mention the tools you really know inside out in the resume.

Q1. Write a Ruby program to check if a directory exists or not.
Ans. 
Ruby program to check if a directory exists
• Use the File.directory? method in Ruby to check if a directory exists

• Provide the directory path as an argument to the method

• Return true if the directory exists, false otherwise
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Q2. What are the SQL query optimization techniques?
Ans. 
SQL query optimization techniques improve performance by reducing query execution time.
• Use indexes to speed up data retrieval

• Avoid using SELECT * and only retrieve necessary columns

• Optimize joins by using appropriate join types (e.g. INNER JOIN, LEFT JOIN)

• Use WHERE clause to filter data early in the query

• Avoid using subqueries if possible
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Q3. What are the use cases for Chef, and why is it necessary in DevOps?
Ans. 
Chef is a configuration management tool used in DevOps to automate infrastructure deployment and management.
• Automating server configuration and management

• Ensuring consistency across environments

• Enabling infrastructure as code practices

• Automating application deployment processes

• Managing complex infrastructure at scale
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