Prev Next

DataStructures / System Design

Explain 12-Factor App methodology.

The Twelve(12)-Factor App methodology is a methodology for building software-as-a-service applications. These best practices are designed to enable applications to be built with portability and resilience when deployed to the web.

Factor.Description.
CodebaseThere should be exactly one codebase for a deployed service with the codebase being used for many deployments.
DependenciesAll dependencies should be declared, with no implicit reliance on system tools or libraries.
ConfigConfiguration that varies between deployments should be stored in the environment.
Backing servicesAll backing services are treated as attached resources and attached and detached by the execution environment.
Build, release, runThe delivery pipeline should strictly consist of build, release, run.
ProcessesApplications should be deployed as one or more stateless processes with persisted data stored on a backing service.
Port bindingSelf-contained services should make themselves available to other services by specified ports.
ConcurrencyConcurrency is advocated by scaling individual processes.
DisposabilityFast startup and shutdown are advocated for a more robust and resilient system.
Dev/Prod parityAll environments should be as similar as possible.
LogsApplications should produce logs as event streams and leave the execution environment to aggregate.
Admin ProcessesAny needed admin tasks should be kept in source control and packaged with the application.

It's right time to invest in Cryptocurrencies Dogecoin! Earn free bitcoins up to $250 now by signing up.

Earn bitcoins upto $250 (free), invest in other Cryptocurrencies when you signup with blockfi. Use the referral link: Signup now and earn!

Using BlockFi, don't just buy crypto - start earning on it. Open an interest account with up to 8.6% APY, trade currencies, or borrow money without selling your assets.


Join CoinBase! We'll both receive $10 in free Bitcoin when they buy or sell their first $100 on Coinbase! Available in India also. Use the referral Join coinbase!


Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.


Webull! Receive free stock by signing up using the link: Webull signup.

More Related questions...

Difference between horizontal and vertical scaling. What is a Load Balancer? Explain few load balancing algorithms that you know. Explain CAP theorem. Explain the BASE property of the database. Explain ACID properties of database transactions. What is database sharding? Difference between database sharding and partitioning. Difference between eventual and strong consistency in Distributed Databases. How to choose between SQL and No-SQL Database? What is TLS? Explain Request Throttling. Difference: hard vs soft real-time system. What is NAT-T (NAT Traversal)? What does HLS stand for? Security measures to follow when you are developing your projects. Explain about EquiFax 2017 security incident. Different Injection defects. Different Authentication & access control defects. Causes of Data protection defects. What is Cross-site scripting? What is SQL injection? Explain Command injection. What is meant by Insecure redirects? Explain about "insecure upload/download" injection defect. What is the "Buffer overflow" attack? Differentiate Authentication and Authorization. What is parameter tampering? What is Cross-site request forgery (CSRF)? What is SACM (Service Asset and Configuration management)? What is digital accessibility? What is WAI-ARIA? What is VUI? What are Alexa skills? What is DNS TXT record? What is Resident Set Size (RSS)? Explain 12-Factor App methodology. What is certificate pinning? Difference between SSL authentication and Mutual SSL Authentication. What is OAUTH? What is a Canary release? What is Domain Driven Design? Difference between TLS and MTLS. What is RSocket? What is Site reliability engineering (SRE)? Difference Between Semaphore and Mutex. What is Privilege Escalation? What is SSRF? Best practices for Strong cryptography. Define Latency and throughput. What is Insecure Design? What is threat modeling? Explain STRIDE threat modeling. What is meant by tokenization?
Show more question and Answers...

Amazon Web Service (AWS)

Comments & Discussions