AT&T Devops Engineer Interview Questions and Answers

Q1. Jenkins automation
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Q2. Kubernates linux
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Q1. Explain MessageQueue
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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...read more
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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...read more
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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...read more
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Q1. Terraform docker
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Q2. About kubernetes
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Just gave one peoblem and asked to code it.

Q1. Questions about networking.
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Q2. Different topologies.
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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...read more
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Q1. Just general HR questions.
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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. Questions related to linux,docker,kubernets,ansible etc
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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...read more
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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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Q1. What is CICD
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CI/CD is a set of practices that automate the processes of software development, testing, and deployment for faster delivery.
• Continuous Integration (CI): Developers frequently merge code changes into a central repository, triggering automated builds and tests. Example: Using Jenkins to run tests on every commit.

• Continuous Delivery (CD): Ensures that code changes are automatically prepared for a release to production, a...read more
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Q2. What are the monitoring tools did you use?
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Monitoring tools are essential for tracking system performance, availability, and health in DevOps environments.
• Prometheus: An open-source monitoring system that collects metrics from configured targets at specified intervals, providing powerful querying capabilities.

• Grafana: A visualization tool that integrates with various data sources, including Prometheus, to create interactive and informative dashboards.

• Nagios: A ...read more
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