# Deployment & Production (Ruby on Rails)

> Capistrano, Docker, Heroku, AWS, database.yml, credentials.yml.enc, precompile assets, zero-downtime deployments

- 20 interview questions
- Senior
- [Interview Questions: Ruby on Rails](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions.md)

## 1. Which command should be used to precompile Rails assets before a production deployment?

**Answer**

The rails assets:precompile command compiles all assets (JavaScript, CSS, images) into optimized files with fingerprinting for cache busting. This step is essential before any production deployment to ensure assets are ready to be served efficiently. The RAILS_ENV=production variable ensures compilation uses production settings.

## 2. In which file does Rails 7+ store encrypted credentials for production?

**Answer**

Rails 7+ uses config/credentials.yml.enc to store secrets in an encrypted manner. This file can be committed to the repository since it is encrypted with a master key. For specific environments, Rails also supports config/credentials/production.yml.enc with its own decryption key.

## 3. What is the main role of Capistrano in a Rails deployment workflow?

**Answer**

Capistrano is a deployment automation tool that executes commands on remote servers via SSH. It manages releases with a symlink system enabling instant rollbacks, runs migrations, precompiles assets and restarts application servers. Its versioned releases approach simplifies deployment management.

## 17 more questions available

- How to access a credential stored in credentials.yml.enc from Rails code?
- Which configuration in database.yml allows managing multiple read replicas for production?

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## Other Ruby on Rails interview topics

- [Ruby Basics](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-basics.md): 25 questions, Junior
- [Ruby Object-Oriented Programming](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-oop.md): 20 questions, Junior
- [Rails Fundamentals](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-fundamentals.md): 18 questions, Junior
- [Routing & Controllers](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/routing-controllers.md): 22 questions, Junior
- [ActiveRecord Basics](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-basics.md): 25 questions, Junior
- [Views & ERB Templates](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/views-erb-templates.md): 20 questions, Junior
- [ActiveRecord Associations](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-associations.md): 24 questions, Mid-Level
- [Advanced ActiveRecord Queries](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-queries.md): 28 questions, Mid-Level
- [Rails Forms](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-forms.md): 20 questions, Mid-Level
- [Authentication & Authorization](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/authentication-authorization.md): 22 questions, Mid-Level
- [Modern Asset Pipeline & Frontend](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-asset-pipeline.md): 18 questions, Mid-Level
- [Rails API Mode](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-api-mode.md): 20 questions, Mid-Level
- [Testing with RSpec](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-testing-rspec.md): 24 questions, Mid-Level
- [ActiveJob & Background Jobs](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-job-background-jobs.md): 20 questions, Mid-Level
- [ActionCable & WebSockets](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/action-cable-websockets.md): 18 questions, Mid-Level
- [ActionMailer](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/action-mailer.md): 18 questions, Mid-Level
- [ActiveStorage](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-storage.md): 20 questions, Mid-Level
- [Caching Strategies](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/caching-strategies.md): 20 questions, Mid-Level
- [Advanced Migrations](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/database-migrations-advanced.md): 20 questions, Mid-Level
- [Rails Engines & Modular Apps](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-engines-modular-apps.md): 18 questions, Senior
- [Performance Optimization](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/performance-optimization.md): 26 questions, Senior
- [Rails Design Patterns](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-design-patterns.md): 22 questions, Senior
- [Ruby Metaprogramming](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-metaprogramming.md): 20 questions, Senior
- [Rails Security](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-security.md): 22 questions, Senior
- [GraphQL with Rails](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/graphql-rails.md): 20 questions, Senior
- [Monitoring & Logging](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/monitoring-logging.md): 20 questions, Senior
- [Rails Upgrade Strategies](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-upgrade-strategies.md): 18 questions, Senior

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