Comcast India Engineering Center Devops Engineer Interview Questions and Answers

Q1. How to connect aws with gcp
Ans. 
AWS and GCP can be connected using various methods such as VPN, direct peering, or third-party tools.
• One way is to use VPN to establish a secure connection between the two cloud platforms.

• Another way is to use direct peering which allows for a private connection between the two platforms.

• Third-party tools like Equinix Cloud Exchange Fabric can also be used to connect AWS and GCP.

• It is important to consider factors like...read more
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Q2. Sonaqube usage and what it does
Ans. 
SonarQube is a tool for continuous code quality inspection and management.
• SonarQube analyzes code for bugs, vulnerabilities, and code smells.

• It provides detailed reports and metrics on code quality.

• It integrates with CI/CD pipelines for continuous code inspection.

• SonarQube supports multiple programming languages including Java, C#, Python, and more.

• It can be used to enforce coding standards and best practices across te...read more
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Q3. Kubernetes manifest files related
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Q4. Logging and monitoring tools related
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Q1. Diff b/w replicaset,daemonset and deployment
Ans. 
ReplicaSet ensures a specified number of replicas of a pod are running, Deployment manages ReplicaSets, DaemonSet ensures a pod runs on all nodes.
• ReplicaSet: ensures a specified number of replicas of a pod are running

• Deployment: manages ReplicaSets and provides declarative updates for Pods and ReplicaSets

• DaemonSet: ensures a pod runs on all (or some) nodes in a cluster

• Example: ReplicaSet can be used to ensure high avai...read more
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Q2. Port fordwaring in proxy
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Port forwarding in proxy involves redirecting traffic from one port to another through the proxy server.
• Port forwarding is useful for accessing services on a remote network through a proxy server.

• It can be done using tools like SSH tunneling or configuring the proxy server to forward traffic.

• For example, to access a web server on port 80 of a remote network through a proxy server, the proxy server can be configured to ...read more
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Q3. Diff between classic network and app loadbalancer
Ans. 
Classic network load balancer operates at transport layer while app load balancer operates at application layer.
• Classic network load balancer distributes traffic based on IP address and port number.

• App load balancer distributes traffic based on URL, host or path.

• Classic network load balancer supports TCP and SSL protocols.

• App load balancer supports HTTP and HTTPS protocols.

• App load balancer provides advanced routing fe...read more
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Q4. How do use script to schedule backup in server
Ans. 
To schedule backups in a server using a script, you can use a cron job.
• Create a backup script that includes the necessary commands to backup the desired files or directories.

• Set the script to be executable using the chmod command.

• Create a cron job using the crontab command that specifies the frequency and timing of the backups.

• Test the backup script and cron job to ensure they are working correctly.
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Q5. How to give access to particula s3 bucket
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To give access to a particular S3 bucket, create an IAM user with appropriate permissions and policies.
• Create an IAM user with access to the S3 bucket

• Attach policies to the IAM user that allow access to the S3 bucket

• Ensure that the IAM user has the necessary permissions to perform the required actions on the S3 bucket

• Use AWS CLI or AWS Management Console to grant access to the IAM user
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Q6. Few scenario based questions in k8s
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Q1. Best practice to write docker file
Ans. 
Best practices for writing Dockerfiles ensure efficient, secure, and maintainable container images.
• Use a minimal base image (e.g., 'FROM alpine' instead of 'FROM ubuntu') to reduce size.

• Leverage multi-stage builds to keep final images small and only include necessary artifacts.

• Order instructions from least to most frequently changed to optimize caching (e.g., COPY package.json first).

• Use specific tags for base images (...read more
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Q2. Ansible Plabook to rotate password of s vm
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Ansible Playbook to automate password rotation for a virtual machine securely.
• Define the playbook structure with hosts and tasks.

• Use the 'user' module to change the password: 'user: name=username password=newpassword'.

• Utilize 'ansible-vault' to encrypt sensitive data like passwords.

• Example task: - name: Rotate password user: name: myuser password: '{{ new_password }}'

• Ensure to test the playbook in a safe envi...read more
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Two Coding questions and MCQs in SQL and aptitude

Q1. Explain SDLC , explain waterfall model, Write any code in Java
Ans. 
Explanation of SDLC, waterfall model and Java code
• SDLC stands for Software Development Life Cycle and is a process followed for software development

• Waterfall model is a linear sequential approach to software development

• Java code example: System.out.println("Hello World!");
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Q1. Tell me about yourself.Weakness and strengths
Ans. 
I am a DevOps Engineer with strong technical skills and a passion for automation and problem-solving.
• Strong knowledge of cloud platforms like AWS and Azure

• Proficient in scripting languages like Python and Bash

• Experience with configuration management tools like Ansible and Puppet

• Ability to troubleshoot and resolve complex technical issues

• Excellent communication and collaboration skills

• Detail-oriented and able to priorit...read more
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