Techatcore Interview Questions and Answers

Helm2 is Tiller-based, Helm3 is Tiller-less. Helm3 has improved security, performance, and reliability.

• Helm2 relies on Tiller for managing releases, Helm3 removes Tiller completely.

• Helm3 has improved security by removing Tiller, reducing attack surface.

• Helm3 has better performance due to simplified architecture.

• Helm3 offers better reliability with features like library charts and improved release management.

Develop a web application using React, Node.js, and MongoDB within 2 weeks

• Start by setting up the backend with Node.js and Express

• Create the frontend using React for a responsive user interface

• Use MongoDB for database management and integration with Node.js

• Implement RESTful APIs for communication between frontend and backend

• Test the application thoroughly before deployment

Retesting is testing the same functionality again after fixing the defects. Regression testing is testing the entire system after changes.

• Retesting ensures that the defects have been fixed and the functionality is working as expected.

• Regression testing ensures that the changes made to the system have not affected the existing functionality.

• Defect tracking tool is used to track and manage defects found during testing.

• SDLC (Software Development Life Cycle) is the process of dev...read more

Circuit Breaker is a design pattern used in microservices to prevent cascading failures.

• Circuit Breaker monitors the availability of a service and prevents requests from being sent if the service is unavailable.

• It helps in improving the resilience of the system by providing a fallback mechanism.

• When the Circuit Breaker is open, it redirects calls to a predefined fallback method or returns an error response.

• Once the service is back online, the Circuit Breaker can be reset to a...read more

Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Used to restrict the instantiation of a class to one object

• Provides a global point of access to the instance

• Commonly used in logging, caching, thread pools, database connections

• Example: Database connection manager class with a single instance