Understanding the Use of Dynos in Heroku

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Due to the growing customer needs, scalability and efficient deployment of web applications have become essential. Heroku provides an all-in-one solution to address the needs with the' Dynos' feature. But what is Dyno in Heroku, and how does it work?

About Dynos in Heroku

It is required to learn about containerization before understanding the functioning of dynos. App development becomes easier with software abstractions, as containerization effectively handles virtual devices or hardware. 

The cloud platform, Heroku, packages the app code into isolated containers to offer OS, memory, computing, and a file system. Heroku works amazingly for app deployment compared to manual hardware management. 

The dynos are Lightweight Linux-based containers used by Heroku. These isolated containers implement codes according to user commands. Based on the app's resource demand, Heroku automatically scales these dynos. The dyno deployment helps build and scale flexible applications without any concerns related to its infrastructure.

Types of Dynos in Heroku

Based on the app requirement for dynos, you can pick the suitable type:


It is designed to manage web processes like HTTP requests. When operated on a web server, dynos respond to web traffic. The web type is perfect for serving cloud applications and APIs. It handles incoming requests and actively responds to user interactions.

The number of concurrent requests handled depends on the dyno configuration. The routing layer allocates the requests to balance out the traffic generated by users. It helps maintain the app's responsiveness and availability.


It is perfect for handling asynchronous or background work in the app. Instead of handling web requests, it manages tasks that do not require immediate response. These dynos are good for background processing tasks like emails, computations, etc.

Wherever the tasks are in the queue, the lightweight containers offload the resource-intensive tasks and ensure web dynos stay active for immediate response. By managing the workload, the worker dynos improve the user experience and app performance.


These dynos can work on various administrative tasks. It is possible to update the database schema by running the database migration. These containers do data analysis and run maintenance scripts. You can even initiate an interactive console session to debug and inspect the app. It helps prioritize the on-demand tasks by manipulating both dynos, i.e., web and worker.

Configurations in Dynos

To customize the performance and functionality of the app, Heroku allows the dyno configuration to be different. Available configuration settings are:


For small applications, one can use free dynos to handle user requests. If inactivity lasts for more than 30 minutes, free dynos will automatically sleep and become unavailable instantly. For temporary handling and responding to requests, consider using free dynos.


The hobby configuration is perfect for minor projects that require continuous execution. Even during the inactivity, the containers will stay active. Pay the monthly fee to get unstoppable request handling services.


The performance configuration is perfect for high-traffic production applications. Compared to other dynos, it promises better performance, handles more resources simultaneously, and improves app availability. Standard dynos are well-optimized to handle massive workloads.

Uses of Dynos in Heroku

1. App Scaling by Using Dynos

Scaling of the web app is vital to handle excessive traffic. By using dynos by Heroku, scale up your app in both ways, i.e., horizontally and vertically. During horizontal scaling, the load coming from the incoming requests is allocated to multiple workers.

However, in the vertical type, the current workers have to boost their capacity to manage traffic. Before making the scaling decisions, it is vital to track the app performance and other metrics. Assign resources only when you think it is necessary, keeping in mind your financial plan and app performance.

Techniques for Scaling

A complex application requires advanced techniques for scaling and improving its functionality. Consider techniques like:

  • Dyno Formation

As per your requirements, choose the suitable type and number of dynos for specific commands. It will help allocate a precise number of resources and optimize the application, which leads to better performance. If your app experiences a load of high traffic, you should allocate more dynos to handle the tasks efficiently.

  • Autoscaling

Depending on the traffic patterns, the number of dynos is adjusted and allocated automatically. Auto-scaling can also manage traffic spikes by demanding resources whenever required. You do not need to alter any settings. This feature smoothens the overall user experience and optimizes cost during minimal activity.

  • Add-ons

Along with dynos, integrate several third-party services, such as caching solutions, databases, etc. Integrated tracking tools can monitor and enhance the app's execution. Through add-ons, the app's capability is extended, and it can perform more operations.

  • Pipeline Deployment

The deployment process can be automated by enacting the CI/CD pipeline settings. Adding the pipeline tool will help in improving the workflow between development and production. It will ensure that new updates or features are deployed immediately when requested. The release cycle will accelerate, reducing the downtime.

  • Performance Tuning

The tuning settings are meant to boost the dyno performance by including the tuning code in the app and updating the database queries. Reduce the load time by enabling the caching strategies. No matter how much load the application is experiencing, your app will run smoothly if you monitor and tweak the performance consistently.

2. Balancing Load Using Dynos 

The unique mechanism for counterbalancing ongoing requests on Heroku transfers ongoing requests across different web dynos. The load balancer, also known as the routing mesh, ensures that each dyno is served with limited requests for quick and easy processing.

In return, overall app execution and response time improve. There is no need to configure anything because the process of managing requests is automatic. If you want to take full advantage of the routing capabilities provided by Heroku, you need to focus on designing a concurrent app.

3. Handling and Executing Applications

To run your app using dyno, execute a command in the Procfile prepared with the slug. The executing dyno is a secure and lightweight container that includes the app slug stored in the file system. Users can choose the desired number of dynos to be utilized in their application. On Heroku, one dyno will run automatically by the platform itself.

The process starts with booting the dyno and loading the container with a slug using the web-process command in the Procfile. As per the requirement, add more dynos and process them in a line. The existing dynos will die automatically once you deploy the latest app version, and the new containers will replace the existing ones automatically. This is how dynos are crucial for application scaling.

Pricing for Dynos in Heroku

Dyno TypeDescriptionPrice
FreeIdeal for non-commercial apps$0/month
HobbySuitable for small apps$7/month per dyno
Standard 1XGeneral-purpose dynos$25/month per dyno
Standard 2XDouble capacity of Standard 1X$50/month per dyno
Performance MHigh-performance dynos$250/month per dyno
Performance LExtra-large performance dynos$500/month per dyno
Private SSmall private dynos$250/month per dyno
Private MMedium private dynos$500/month per dyno
Private LLarge private dynos$1,500/month per dyno

Configurations of Dynos in Heroku

Dyno TypeMemoryCPU ShareSleepIdeal For
Free512 MB1x (shared)Sleeps after 30 mins idleNon-commercial apps, testing, and development
Hobby512 MB1x (shared)Never sleepsSmall projects and personal apps
Standard 1X512 MB1x (shared)Never sleepsWeb applications with moderate traffic
Standard 2X1 GB2x (shared)Never sleepsHigher traffic web apps and background workers
Performance M2.5 GBDedicatedNever sleepsHigh-performance applications and APIs
Performance L14 GBDedicatedNever sleepsResource-intensive applications and services
Private S512 MB1x (dedicated)Never sleepsSmall-scale apps requiring isolated environments
Private M2.5 GB1x (dedicated)Never sleepsMedium-scale apps with higher resource needs
Private L14 GB1x (dedicated)Never sleepsLarge-scale apps with significant resource needs

How to configure Dynos in Heroku?

Step 1: Set Up Your Application

web: node index.js

Step 2: Install Heroku CLI

Download ->

Step 3: Log In to Heroku

heroku login

Step 4: Create a New Heroku App

heroku create your-app-name

Step 5: Deploy Your Application

git push heroku main

Step 6: Scale Dynos in Heroku

heroku ps:scale web=1:standard-1x

Step 7: Configure Environment Variables

heroku config:set NODE_ENV=production

Step 8: Monitor Dynos

heroku ps

Step 9: Configure Add-ons

heroku addons:create heroku-postgresql:hobby-dev

Step 10: Access Logs

heroku logs --tail


Dynos in Heroku are crucial elements for deploying, handling, and scaling apps. For optimal and smooth app performance in the cloud environment, choose suitable types with configurations. No matter what application you are developing, you need Heroku's robust platform for handling and allocating user requests.

The utilization of dynos will improve the overall functioning of the app and boost the response time. With increased user demands, it is mandatory to scale up your app, and hence, dynos can help you do so. Like other high-performing web apps, you can develop yours, too.

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