Ericsson Devops Engineer Interview Questions and Answers

Q1. About your current work, roles and responsibilities, how do you debug issues more on kubernetes
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Q1. Questions on Docker, multistage dockerfile, all about docker and its troubleshooting
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Q1. Jenkins plugin debugging, kubernetes issues debugging, branching strategies, release management and shell scripting on how would you monitor k8 crashing pods in all namespaces
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Q1. About previous experience, more on work culture and why do you want to switch
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Q1. Explain MessageQueue
Ans. 
MessageQueue is a communication system that allows different software components to communicate by sending messages asynchronously.
• MessageQueue helps in decoupling different components of a system.

• It allows for asynchronous communication between components.

• Messages are stored in a queue until they are processed by the receiving component.

• Examples include RabbitMQ, Apache Kafka, and Amazon SQS.
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Q2. Design of Loadbalancer for Kubernetes
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Designing a Loadbalancer for Kubernetes involves using an Ingress Controller to route traffic to different services.
• Use an Ingress Controller to manage external access to services within a Kubernetes cluster

• Define Ingress resources to specify how incoming requests should be routed

• Consider using a cloud provider's load balancer service for external traffic

• Implement SSL termination and routing rules in the Ingress Contro
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Q1. How do you perform docker migration from one machine to another machine?
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Docker migration from one machine to another involves exporting the container as an image, transferring the image to the new machine, and then importing it.
• Export the Docker container as an image using 'docker save' command

• Transfer the image to the new machine using a secure method like SCP or Docker Hub

• Import the image on the new machine using 'docker load' command

• Run the container on the new machine using 'docker run
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Q2. How will you handle production deployment issues?
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I will troubleshoot the issue, identify the root cause, and work with the team to implement a solution while minimizing downtime.
• Quickly assess the situation and gather relevant information

• Identify the root cause of the deployment issue

• Collaborate with team members to come up with a solution

• Implement the solution while minimizing impact on production environment

• Communicate with stakeholders about the issue and resoluti
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Easy mostly from time work problem

Hackerearth interview round was conducted

Q1. More about kubernetes and docker
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Q1. Regarding AWS networking, Jenkins, Terraform, Linux
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Q2. Write dockerfile to run python script.
Ans. 
Dockerfile to run a Python script
• Use a base Python image as the starting point

• Copy the Python script into the container

• Specify the command to run the Python script
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Q3. Run vs CMD vs ENTRYPOINT.
Ans. 
Run vs CMD vs ENTRYPOINT are Docker instructions used to specify commands to be executed when a container is launched.
• RUN is used to execute commands during the build of the image

• CMD is used to provide default arguments for the entrypoint or to specify the command to run when the container starts

• ENTRYPOINT is used to specify the executable that will run when the container starts, and CMD can be used to provide addition...read more
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Q4. How to upgrade kubernetes cluster version
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To upgrade a Kubernetes cluster version, you can use kubeadm tool or manually update each component.
• Use kubeadm tool to upgrade the cluster version

• Check the current version of the cluster using kubectl

• Upgrade the control plane components first, followed by worker nodes

• Ensure compatibility of applications with the new version before upgrading

• Backup important data and configurations before upgrading
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Q5. Terraform file to provision ec2 instance and import existing instance with their configuration
Ans. 
Use Terraform to provision ec2 instance and import existing instance with their configuration
• Create a Terraform configuration file with necessary resources like aws_instance

• Use the import command to import existing instance with their configuration

• Update the Terraform configuration file with the imported instance details

• Apply the Terraform configuration to provision the ec2 instance
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Q1. What is ssh Port numb Process and logs Dns
Ans. 
SSH (Secure Shell) is a network protocol used for secure communication between a client and a server.
• SSH uses port number 22 by default for communication.

• The SSH process involves authentication, encryption, and data exchange between the client and server.

• SSH logs can be used for auditing and troubleshooting purposes.

• DNS (Domain Name System) is not directly related to SSH but can be used to resolve hostnames to IP addre
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Q2. Explain dhcp process and dora process
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DHCP process involves four steps - Discover, Offer, Request, Acknowledge. DORA process is the sequence of these steps.
• DHCP Discover - Client broadcasts a request for IP address

• DHCP Offer - Server responds with an available IP address

• DHCP Request - Client requests the offered IP address

• DHCP Acknowledge - Server confirms the IP address assignment
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Q3. Configuration of nfs server
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Configuration of NFS server involves setting up exports, permissions, and client access.
• Install NFS server package (e.g. nfs-kernel-server)

• Edit /etc/exports file to define shared directories and permissions

• Restart NFS server service after making changes (e.g. systemctl restart nfs-server)

• Set up firewall rules to allow NFS traffic if necessary
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All basics topics like profit and loss etc

Q1. Related to sql queries and basic cs fundamental questions.
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Q1. Explain about pipeline What is provisoner in terraform etc
Ans. 
A pipeline is a series of automated steps that allow for the continuous integration and delivery of software.
• A pipeline typically includes stages such as building, testing, and deploying code.

• Tools like Jenkins, GitLab CI/CD, and AWS CodePipeline are commonly used for creating pipelines.

• Pipelines help in automating the software development process and ensuring faster delivery of updates.

• Provisioner in Terraform is a to...read more
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Q2. Cicd process explained
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CI/CD process automates the building, testing, and deployment of code changes.
• Continuous Integration (CI) involves automatically building and testing code changes frequently.

• Continuous Deployment (CD) involves automatically deploying code changes to production.

• CI/CD pipelines use tools like Jenkins, GitLab CI/CD, or CircleCI to automate the process.

• Automated testing is a key component of CI/CD to ensure code quality.

• CI...read more
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