10+ Crest Data Systems Interview Questions and Answers

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 Dockerfile by using .dockerignore file to exclude unnecess...read more

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

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

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 progress

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 network namespace as the main container, allowing them to com...read more

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

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.

• Orchestration ensures that different components work together e...read more

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

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('Build') { steps { sh 'mvn clean package' } } stage('Test') {...read more

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 repositories and can be easily shared and reused by the communit...read more

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.

I have experience in various types of testing including functional, regression, performance, and security testing.

• Functional testing - testing the functionality of the software against the requirements

• Regression testing - testing the software after changes have been made to ensure that existing functionality has not been affected

• Performance testing - testing the software's performance under different loads and conditions

• Security testing - testing the software's security featu...read more