Crest Data Systems Interview Questions, Process, and Tips

Q1. Linux Questions are Asking
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Q1. What is dockerfile
Ans. 
Dockerfile is a text file that contains instructions to build a Docker image.
• Dockerfile is used to define the environment and dependencies for a Docker container

• It includes commands like FROM, RUN, COPY, and CMD to specify the base image, run commands, copy files, and set the default command

• Dockerfile is used with the 'docker build' command to create a Docker image
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Q2. What is jenkinsfile
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Jenkinsfile is a text file that defines the pipeline for a Jenkins job.
• Jenkinsfile is written in Groovy scripting language.

• It allows defining the entire pipeline as code, including build, test, and deployment stages.

• Jenkinsfile can be stored in version control along with the project code for better traceability.

• It enables automation and repeatability of the CI/CD process.

• Example: pipeline { agent any stages { stage('Bu...read more
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Q3. How to reduce size of docker file
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To reduce the size of a Docker file, remove unnecessary dependencies, use multi-stage builds, optimize layers, and use smaller base images.
• Remove unnecessary dependencies and files

• Utilize multi-stage builds to reduce the number of layers

• Optimize layers by grouping related commands together

• Use smaller base images like Alpine instead of larger ones like Ubuntu
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Q4. What is orchestration
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Orchestration is the automated arrangement, coordination, and management of complex computer systems or services.
• Orchestration involves automating tasks such as provisioning, configuration, deployment, scaling, and monitoring of software applications.

• It helps in streamlining and optimizing the workflow of various components in a system.

• Popular orchestration tools include Kubernetes, Docker Swarm, and Apache Mesos.

• Orche...read more
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Q5. What is azure devops and how to use it
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Azure DevOps is a set of development tools provided by Microsoft to help teams plan, build, and deploy software applications.
• Azure DevOps includes services for version control, build automation, release management, and more

• It allows for collaboration between development and operations teams

• Users can create pipelines to automate the build and deployment process

• Azure Boards can be used for project management and tracking
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Q6. What is helm charts
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Helm charts are packages of pre-configured Kubernetes resources used for deploying applications.
• Helm charts are used to define, install, and upgrade Kubernetes applications.

• They are written in YAML and can include templates for Kubernetes resources like deployments, services, and ingress.

• Helm charts can be customized using values files to adjust configurations for different environments.

• Helm charts are stored in reposi...read more
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Host webapp container using dockerfile and dockercompose

Q1. Where do you see yourself in next 5 years
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Q1. Details Gathering
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Q1. Basic and fundamental of JavaScript.
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Q2. Concepts of ReactJs or whatever technology you are applying for.
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Q3. Basic DSA question.
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Practical task to check code quality, logic, etc.

Q1. Basic DSA questions, started with smallest/largest element and went till maths and dp steps questions.
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Q1. This was done with CTO, question asked was trapping rain water LC - hard
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Q1. Standard questions in HR like why crest?
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Q2. What makes you a different candidate?
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Q3. Strengths and weaknesses?
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Q4. You have published a research paper do you aspire to be a researcher?
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Q1. Reverse a string, 3rd max salary from employee table,
Ans. 
The question asks for reversing a string and finding the 3rd maximum salary from an employee table.
• To reverse a string, iterate through the characters and swap the first and last characters until reaching the middle.

• To find the 3rd maximum salary, sort the salaries in descending order and return the third element.

• If the employee table is stored in an array of objects, access the salary property of each object.
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Q2. Matrix spiral, etc basic questions
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Q1. Where will you see yourself in 5 years? Are you okay with a bond of 1.5 years, etc.? Basic questions
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Q1. What are the steps to decrease a size of dockerfile
Ans. 
To decrease the size of a Dockerfile, steps such as using multi-stage builds, minimizing layers, and optimizing image size can be taken.
• Use multi-stage builds to reduce the number of layers in the final image

• Minimize the number of RUN commands by combining them into a single command

• Remove unnecessary files and dependencies from the image

• Use smaller base images like Alpine instead of larger ones like Ubuntu

• Optimize the ...read more
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Q2. What is init container
Ans. 
Init container is a special type of container in Kubernetes that runs before the main application container starts.
• Init containers are used to perform tasks such as setting up configuration files, initializing a database, or waiting for a service to be ready before the main container starts.

• They run to completion before the main container starts, ensuring that any dependencies are met.

• Init containers share the same net...read more
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Q3. What is role of nodeport type service
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NodePort type service exposes a service on a specific port on all nodes in the cluster.
• NodePort type service allows external traffic to access a service in a Kubernetes cluster

• It assigns a static port on each node, which forwards traffic to the service

• It is commonly used for accessing applications externally in a development environment
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Q4. How to configure vpc peering
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VPC peering allows connecting two VPCs to communicate with each other using private IP addresses.
• Ensure both VPCs are in the same region

• Update route tables in both VPCs to allow traffic between them

• Ensure there are no overlapping CIDR blocks

• Accept the peering connection request in both VPCs
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Write a Dockerfile to create image for a web app

Q1. How do you see yourself after 5 years
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