Cognizant Devops Interview Questions and Answers

To run cmd commands using python on windows, use the subprocess module.

• Import the subprocess module

• Use the subprocess.run() method to execute the command

• Pass the command as a list of strings to the run() method

• Use the shell=True argument to run the command in a shell environment

• Capture the output of the command using the stdout attribute of the returned CompletedProcess object

Deep copy creates a new object with a new memory address while shallow copy creates a new object with the same memory address as the original object.

• Deep copy creates a completely new object with a new memory address.

• Shallow copy creates a new object with the same memory address as the original object.

• In deep copy, changes made to the copied object do not affect the original object.

• In shallow copy, changes made to the ...read more

Namespace in Docker is a way to isolate resources and avoid naming conflicts.

• Namespaces provide a layer of isolation for containers

• Each namespace has its own set of resources

• Namespaces can be used for network, process, and mount isolation

• Example: docker run --name mycontainer --net=container:othercontainer myimage

Send email with attachment using PowerShell

• Use Send-MailMessage cmdlet

• Specify recipient, subject, body and attachment parameters

• Example: Send-MailMessage -To 'example@email.com' -Subject 'Test Email' -Body 'This is a test email' -Attachments 'C:\test.txt'

To install IIS using PowerShell, use the Install-WindowsFeature cmdlet.

• Open PowerShell as an administrator

• Run the command: Install-WindowsFeature -name Web-Server -IncludeManagementTools

• Press 'Y' to confirm installation

• Wait for the installation to complete

Setup microservice testing and deployment using Kubernetes, containers, Jenkins, and Cloud services.

• Create a Kubernetes cluster on a Cloud provider

• Build Docker containers for each microservice

• Create a Jenkins pipeline for testing and deployment

• Use Kubernetes to deploy and manage the containers

• Use Cloud services for load balancing, monitoring, and scaling

SSL certification can be configured with Tomcat by generating a keystore file and configuring the server.xml file.

• Generate a keystore file using keytool command

• Configure the server.xml file to include the keystore file and password

• Update the connector element in server.xml to include the SSL protocol and port number

• Restart Tomcat to apply the changes

Dynamic inventory is a feature in Ansible that allows for automatic inventory updates based on external data sources.

• Dynamic inventory can be configured to pull inventory information from sources such as cloud providers, configuration management databases, or custom scripts.

• This allows for more flexible and scalable inventory management, as hosts can be added or removed automatically based on changes in the external da...read more

Deleting last 30 days logs in Tomcat using shell script

• Use find command to locate files older than 30 days

• Use xargs command to pass the file names to rm command

• Use crontab to schedule the script to run periodically

To identify the process causing server slowness, use monitoring tools and analyze system logs.

• Use monitoring tools like Nagios, Zabbix, or Prometheus to track system performance metrics.

• Analyze system logs to identify any errors or warnings related to specific processes.

• Check CPU and memory usage of running processes using tools like top or htop.

• Use profiling tools like strace or perf to identify resource-intensive pro...read more

Stages in pipeline job in Jenkins

• Checkout code from version control system

• Build the code

• Run unit tests

• Deploy to staging environment

• Run integration tests

• Deploy to production environment

• Send notification email