AT&T Devops Engineer Interview Questions and Answers

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
Ans. 
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. Questions related to linux,docker,kubernets,ansible etc
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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. Devops life cycle , CICD, Ansible, Shell and groovy script, Jenkins , Gitlab
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Q2. Linux , Networking , past company challenges
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Q1. More detailed as per round 1
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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
Ans. 
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?
Ans. 
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?
Ans. 
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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Q1. Regarding AWS networking, Jenkins, Terraform, Linux
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
Q4. How to upgrade kubernetes cluster version
Ans. 
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer

Just gave one peoblem and asked to code it.

Q1. Questions about networking.
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Q2. Different topologies.
Ans. 
Different network topologies refer to the ways in which devices are connected in a network.
• Bus Topology: all devices are connected to a single cable

• Star Topology: all devices are connected to a central hub

• Ring Topology: each device is connected to two other devices, forming a ring

• Mesh Topology: each device is connected to every other device in the network

• Hybrid Topology: a combination of two or more different topologie
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Q1. Just general HR questions.
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