Question 1

What are 'dynos' and how do they impact my application's performance and cost?

Accepted Answer

Dynos are isolated, virtualized Unix containers that run your application code. They are the fundamental compute units on the platform. Different dyno types (e.g., Free, Hobby, Standard, Performance) offer varying amounts of RAM and CPU. Your application's performance scales by adding more dynos (horizontal scaling) or upgrading to larger dyno types (vertical scaling), directly impacting your monthly billing based on dyno hours and type.

Question 2

Can I use a custom domain with my Heroku application, and how is SSL handled?

Accepted Answer

Yes, you can map custom domains to your applications via the dashboard or CLI. For applications on paid dyno plans, the platform automatically provisions and manages SSL/TLS certificates, ensuring secure HTTPS connections without manual certificate handling. For free/hobby dynos, you might need to use an external CDN like Cloudflare for SSL.

Question 3

How does Heroku handle database services, and can I use my preferred database?

Accepted Answer

The platform offers a wide range of managed database services through its Add-ons marketplace, including Heroku Postgres, Redis, and MongoDB. You can provision these with a single click, and they are automatically configured for your application. While you can connect to external databases, the integrated add-ons provide a streamlined, managed experience.

Question 4

What's the typical deployment workflow for a web application on Heroku?

Accepted Answer

The primary deployment workflow involves pushing your application's Git repository to a dedicated remote. The platform then detects your application's language, builds it, and deploys it to dynos. You can also integrate with CI/CD pipelines for automated deployments on code pushes or merges to specific branches.

Question 5

Is Heroku suitable for high-traffic production web applications, and what are the scaling options?

Accepted Answer

Yes, the platform is designed for production-grade applications. You can scale horizontally by increasing the number of dynos running your web process and vertically by upgrading to more powerful dyno types. Additionally, features like Review Apps for testing, Pipelines for CI/CD, and robust monitoring tools support managing high-traffic applications effectively.

Heroku Website Full Guide (2026)

Introduction

Key Features

Use Cases

Rapid Prototype Deployment

How to Use Heroku

Prepare Application for Deployment

Heroku Alternatives

Fly.io

Microsoft Azure

Linode

Platform.sh

About Heroku

Official Website

Video Mentions

Heroku Status