Vertafore Senior Devops Engineer Interview Questions and Answers

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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Q1. K8s fundamentals. Role of each component
Ans. 
Kubernetes (k8s) fundamentals and role of each component
• Kubelet - agent that runs on each node in the cluster and ensures containers are running

• Kube-proxy - network proxy that maintains network rules on nodes

• Kubernetes API server - central management entity that serves the Kubernetes API

• etcd - distributed key-value store used for storing cluster data

• Kube-controller-manager - runs controller processes to manage the stat...read more
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Q2. How can one troubleshoot the crashloop error in Kubernetes (k8s)?
Ans. 
Troubleshooting crashloop error in Kubernetes involves checking pod logs, examining resource limits, and verifying configuration files.
• Check pod logs to identify the cause of the crashloop.

• Examine resource limits to ensure the pod has enough resources to run.

• Verify configuration files for any errors or misconfigurations.

• Use kubectl commands like describe, logs, and exec to troubleshoot further.

• Consider checking for iss...read more
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1. Log parsing using python

Q1. What are inodes?
Ans. 
Inodes are data structures in Unix-like file systems that store metadata about files, such as permissions, ownership, and location.
• Inodes contain information about files, such as file size, permissions, timestamps, and pointers to data blocks.

• Each file in a Unix-like file system is represented by an inode.

• Inodes are used to efficiently locate and manage files on the file system.

• When a file is created, an inode is also ...read more
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Q2. How do you list all the files held by a process
Ans. 
Use the lsof command to list all files held by a process
• Use the lsof command followed by the -p flag and the process ID to list files held by a specific process

• For example, to list all files held by process ID 1234, run: lsof -p 1234

• You can also use the -c flag to specify a process name instead of ID, like: lsof -c chrome
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Q3. Container vs Virtaul Machines?
Ans. 
Containers are lightweight, portable, and efficient, while virtual machines are more isolated and resource-intensive.
• Containers share the host OS kernel, making them more lightweight and faster to start compared to VMs.

• VMs provide stronger isolation and security by running a separate OS instance for each VM.

• Containers are ideal for microservices architecture and rapid deployment, while VMs are better for running multip...read more
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Q1. Mostly Cloud related questions
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Q1. If round 1 is clear , then be confident in round 2
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Q1. Salary related mainly
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Round duration - 60 minutes
Round difficulty - Medium

Technical interview round that lasted for around 60 minutes. The interviewer asked me programming questions, puzzles, Java basics and some output based questions.

Q1. 
Maximum Non-Adjacent Subsequence Sum
Given an array of integers, determine the maximum sum of a subsequence without choosing adjacent elements in the original array.
Input:
The first line consists of an...read more
Ans. 
Find the maximum sum of a subsequence without choosing adjacent elements in an array.
• Use dynamic programming to keep track of the maximum sum at each index, considering whether to include the current element or not.

• At each index, the maximum sum can be either the sum of the current element and the element two positions back, or the maximum sum at the previous index.

• Iterate through the array and update the maximum sum a...read more
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