Eloelo Senior Devops Engineer Interview Questions and Answers

Q1. Merge 2 Sorted linked list
Ans. 
Merge two sorted linked lists into a single sorted linked list
• Create a new linked list to store the merged result

• Iterate through both input linked lists and compare nodes to determine the order in which they should be merged

• Update the next pointers of the nodes in the new linked list accordingly
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50 questions in 12mins

Q1. Basic DSA question in binary search and memoization
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Q1. 1. Questions around projects : JWT, UserAuthentication etc
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Q2. 2. Write a code to find frequency of characters in a given string?
Ans. 
Code to find frequency of characters in a given string
• Use a hash table to store character frequencies

• Iterate through the string and update the hash table accordingly

• Print the hash table to display the character frequencies
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Q1. 1. Write a code to reverse a linked list?
Ans. 
Code to reverse a linked list
• Create three pointers: prev, curr, and next

• Initialize prev to null and curr to head

• Loop through the list and set next to curr's next node

• Set curr's next node to prev

• Move prev and curr one node ahead

• Return prev as the new head
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Q2. 2. Write a code to reverse linked list in size of K?
Ans. 
Code to reverse linked list in size of K
• Create a function that takes head of linked list and size K as input

• Traverse the linked list in groups of K nodes

• Reverse each group of K nodes using iterative or recursive approach

• Connect the reversed groups to form the final linked list

• Return the new head of the reversed linked list
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Q3. 3. Questions around project and design a database structure for comments system of quora?
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Q1. Basic HR round questions
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Given an simple gaming questions to be developed in JS

Given another UI design in image to be developed

Logical questions MCQ on ansible terraform python and basic programming around 19 questions

Q1. This first round was very nice
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Q2. I can strongly suggest first round
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Q1. 2nd round was worst even that Panel guy is not interested to take an interview
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Q2. Finally you will get bad news
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Q1. Question Regrading Linux, AWS, Kubernetes and Bash scripting
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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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Q1. Explain about kubernetes CRDs
Ans. 
Kubernetes Custom Resource Definitions (CRDs) allow users to define custom resources in Kubernetes.
• CRDs extend the Kubernetes API to create custom resources and controllers.

• They enable users to define their own resource types and manage them using Kubernetes tools.

• CRDs are used to extend the functionality of Kubernetes without modifying the core codebase.

• Examples of CRDs include custom resource types like Deployments, ...read more
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Q1. Explain about kuberneted crds
Ans. 
Kubernetes Custom Resource Definitions (CRDs) allow users to define custom resources in Kubernetes.
• CRDs extend the Kubernetes API to create custom resources and controllers.

• They enable users to define their own resource types and manage them using Kubernetes tools.

• CRDs are used to extend the functionality of Kubernetes without modifying the core codebase.

• Examples of CRDs include custom resource types like databases, qu
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Q1. How AWS ALB works
Ans. 
AWS ALB is a load balancer service that distributes incoming traffic across multiple targets, such as EC2 instances, based on routing rules.
• ALB operates at the application layer (Layer 7) of the OSI model

• Supports path-based routing, host-based routing, and routing based on HTTP headers

• Provides SSL termination, content-based routing, and health checks for targets

• Can handle WebSocket traffic and integrate with AWS WAF fo
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