Amazon Web Services Devops Engineer Interview Questions and Answers

Q1. Introduction why you choose devops any programming language you have learned
Ans. 
I chose DevOps because it allows me to bridge the gap between development and operations, and I have learned multiple programming languages.
• DevOps enables faster and more efficient software delivery

• I have experience with programming languages such as Python, Java, and Bash

• DevOps practices such as continuous integration and deployment are essential for modern software development

• I enjoy working in a collaborative enviro...read more
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Round duration - 60 minutes
Round difficulty - Medium

Online interview round with questions based on DSA and Devops.

Q1. 
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"e...read more
Ans. 
Reverse a given string containing alphabets, numbers, and special characters.
• Create a function that takes a string as input

• Iterate through the string in reverse order and append each character to a new string

• Return the reversed string
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Q2. What are Terraform modules?
Ans. 
Terraform modules are reusable components used to organize and manage resources in Terraform configurations.
• Modules help in organizing Terraform configurations into reusable components

• They allow for better code reusability and maintainability

• Modules can be shared and reused across different Terraform configurations

• They encapsulate a set of resources and their configurations

• Modules can have input and output variables fo
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Q3. How would you debug issues with Apache and Nginx?
Ans. 
To debug issues with Apache and Nginx, check error logs, configuration files, server status, and network connectivity.
• Check error logs for any relevant error messages or warnings.

• Review configuration files for any misconfigurations or typos.

• Check server status to ensure services are running and responding correctly.

• Verify network connectivity to ensure there are no network issues affecting communication.

• Use tools like ...read more
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Q4. How would you prevent a DDoS attack?
Ans. 
To prevent a DDoS attack, implement network security measures, use DDoS mitigation services, and monitor traffic patterns.
• Implement network security measures such as firewalls, intrusion detection systems, and access control lists.

• Use DDoS mitigation services from providers like Cloudflare or Akamai to filter out malicious traffic.

• Monitor traffic patterns and set up alerts for unusual spikes in traffic that could indic...read more
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Round duration - 60 minutes
Round difficulty - Medium

They have a zoom video call. And it's really lengthy.

Q1. How do you block specific IPs on your EC2 instance in AWS?
Ans. 
You can block specific IPs on an EC2 instance in AWS by using security groups or network access control lists (NACLs).
• Use security groups to block specific IPs by creating a new inbound rule with the IP address you want to block and setting the action to 'deny'.

• Alternatively, you can use network access control lists (NACLs) to block specific IPs by adding a rule to deny traffic from the IP address you want to block.

• Rem...read more
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Q2. What is load average in Linux?
Ans. 
Load average in Linux is a measure of system activity, indicating the average number of processes waiting in the run queue over a period of time.
• Load average is displayed as three numbers representing the average number of processes in the system run queue over the last 1, 5, and 15 minutes.

• A load average of 1.0 means the system is at full capacity, while a load average of 0.5 means the system is half as busy.

• High load...read more
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Q3. What is the difference between an inode number and a file descriptor?
Ans. 
Inode number is a unique identifier for a file in a filesystem, while a file descriptor is a reference to an open file.
• Inode number is a metadata associated with a file, stored in the filesystem's inode table.

• File descriptor is a reference to an open file in a process, represented by an integer.

• Inode number remains constant for a file even if it is moved or renamed, while file descriptor changes with each open/close op...read more
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Q4. What happens to the load balancer when an instance in AWS is deregistered?
Ans. 
When an instance in AWS is deregistered, the load balancer stops sending traffic to that instance.
• The load balancer detects the deregistration of the instance and stops routing traffic to it.

• The load balancer redistributes the traffic to the remaining healthy instances.

• The deregistered instance is no longer considered part of the load balancer's target group.

• The load balancer health checks will mark the instance as unh...read more
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Round duration - 60 minutes
Round difficulty - Medium

Technical interview round with questions around Devops

Q1. How can you copy Docker images from one host to another without using a repository?
Ans. 
Docker images can be copied from one host to another using 'docker save' and 'docker load' commands.
• Use 'docker save' command to save the image as a tar file on the source host

• Transfer the tar file to the destination host using SCP or any other file transfer method

• Use 'docker load' command on the destination host to load the image from the tar file
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Q2. How do you debug a website template that is very slow?
Ans. 
To debug a slow website template, analyze performance metrics, check for inefficient code, optimize images and assets, and consider server-side improvements.
• Analyze performance metrics using tools like Chrome DevTools or Lighthouse to identify bottlenecks.

• Check for inefficient code such as unnecessary loops, redundant CSS rules, or large JavaScript files.

• Optimize images and assets by compressing files, using lazy loadi...read more
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Q3. What is a use case that would require the setup of distributed Jenkins nodes?
Ans. 
Setting up distributed Jenkins nodes is necessary for scaling Jenkins infrastructure and improving performance.
• When there is a need to run a large number of jobs simultaneously

• When jobs require different environments or configurations

• When jobs need to be executed on different platforms or operating systems

• When there is a need for high availability and fault tolerance

• When there is a need to reduce build queue times and
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Q4. Can you write an Ansible playbook to install Apache?
Ans. 
Yes, I can write an Ansible playbook to install Apache.
• Use the 'apt' module to install Apache on Debian/Ubuntu systems

• Use the 'yum' module to install Apache on Red Hat/CentOS systems

• Ensure to start and enable the Apache service after installation
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QA related questions. Testing and DevOps

Q1. Technical questions asked and it was good
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Q1. How do you use docker and kubernetes in your project
Ans. 
I use Docker for containerization and Kubernetes for orchestration in my project.
• I use Docker to create lightweight, portable containers for my applications.

• I use Kubernetes to automate deployment, scaling, and management of these containers.

• I define my application's infrastructure and dependencies in Dockerfiles and Kubernetes manifests.

• I use Kubernetes features like pods, services, and deployments to ensure high avai
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Q2. Did you created the kubernetes cluster yourself
Ans. 
Yes, I have experience creating and managing Kubernetes clusters.
• Yes, I have created Kubernetes clusters from scratch

• I have experience configuring and managing nodes in the cluster

• I have deployed applications and services on the Kubernetes cluster

• I have set up monitoring and scaling mechanisms for the cluster
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They first gave me a project to be implemented in Go language, then was called for tefchnival round