Cloud Engineer 2 Interview Questions and Answers

To restart a service on Linux, you can use the systemctl command.

• Use 'systemctl restart ' to restart a service

• Use 'systemctl status ' to check the status of a service

• Use 'systemctl enable ' to enable a service to start on boot

Public IPs are accessible from the internet, while private IPs are only accessible within a specific network.

• Public IPs are used to communicate over the internet.

• Private IPs are used for internal communication within a network.

• Public IPs are unique and routable on the internet.

• Private IPs are typically assigned by a router or DHCP server within a network.

• Examples: Public IP - 203.0.113.1, Private IP - 192.168.1.1

Virtualization is the process of creating a virtual version of a device or resource, such as a server, storage device, network or operating system.

• Allows for better resource utilization by running multiple virtual machines on a single physical machine

• Improves scalability and flexibility of IT infrastructure

• Enhances disaster recovery and backup processes

• Reduces hardware and maintenance costs

• Examples include VMware, Hyper-V, and VirtualBox

LRU Cache is a data structure that stores recently used items in a limited size cache.

• LRU stands for Least Recently Used

• It has a fixed size and when the cache is full, the least recently used item is removed to make space for new items

• It uses a combination of a doubly linked list and a hash map to achieve O(1) time complexity for both insertion and deletion

• When an item is accessed, it is moved to the front of the list to indicate that it is the most recently used item

System design for Uber involves creating a scalable and reliable platform for matching riders with drivers.

• Use microservices architecture for scalability and fault tolerance

• Implement geolocation services for real-time tracking of drivers and riders

• Utilize a distributed database for storing user and trip data

• Design a robust payment system for seamless transactions

• Implement surge pricing algorithms to manage demand during peak hours