This text explains how you can containerize a Subsequent.js software with a Dockerfile for a customizable deployment. On the other hand, you’ll deploy a Subsequent.js app to Kinsta the use of automated deployment.

With Docker, we equipment an software, its atmosphere, and its dependencies into an remoted container. A container is composed of an software operating in a Linux stripped-down model. A Docker symbol is the blueprint for a container, and the container is a operating example of a picture.

To containerize an software, we use a declarative way via a Dockerfile. Docker reads and executes the scripts outlined on this record to construct and deploy your software.

Benefits of Containerizing Your Software

You might have numerous advantages from containerizing an software, comparable to portability, steadiness, scalability, safety, and function. By way of deploying an app to Kinsta with a Dockerfile, you additionally leverage its customizability.


Docker encapsulates the whole lot an software must run, letting them be commuted simply between environments. Whether or not you might be operating it in the community, on a pc with a unique running device, or in staging and manufacturing environments, Docker builds the applying with the similar elements, making it more straightforward to code, check, and deploy.


With Docker, you’ll run a number of circumstances of your container on other servers. Container orchestrators deal with larger site visitors with out affecting your app’s functionality.


By way of operating your app in an remoted container, you’ve got predictable effects when shifting code between building, check, and manufacturing methods. For the reason that your container comprises actual variations of important libraries and programs, it minimizes the chance of insects because of other dependency revisions.

Additionally, when your app is deployed to a manufacturing server, Docker assists in keeping it remoted from different packages, minimizing the chance of being suffering from their site visitors spikes.


Docker packing containers supply a extra safe atmosphere in your workloads than conventional fashions. As they get a divorce your packages into a lot smaller, loosely coupled elements, every remoted from one any other, there’s a considerably decreased assault floor. Docker packing containers lower the danger for hackers to milk your laptop methods and make it tougher for a breach to unfold within the tournament of an assault. Be told extra on this article: 9 Safety Easiest Practices for Docker Boxes.


Boxes don’t include a complete running device like digital machines and conventional servers. With that, packing containers have a significantly smaller footprint and are quicker to build and get started.

Customized Deployment

With Kinsta, you’ll deploy your packages routinely through the use of Buildpacks and Nixpacks. But if the construct procedure is routinely brought on in keeping with your app’s codebase, you don’t have numerous room for customizations. Should you deploy to Kinsta with a Dockerfile, you’ll configure exactly how you need to construct and deploy your software.


To deploy a Subsequent.js software with Docker, you wish to have:

Get started With a Subsequent.js Software

In case you are ranging from an current software, you’ll skip this step. In case you are beginning contemporary, create a brand new Subsequent.js software:

  1. Open your terminal and set up create-next-app:
npm i -g create-next-app@newest
  1. Navigate to the listing the place you need to put in it and create a brand new Subsequent.js software in its personal listing:
npx create-next-app@newest new-app

Subsequent activates you to specify a variety of configuration choices in your new app. For this instructional, you’ll merely settle for the recommended defaults.

  1. To preview your new software, navigate to the new-app listing and run:
npm run dev

In your reference, we created an instance software the use of this system.

Containerize a Subsequent.js App With a Dockerfile

To containerize your Subsequent.js software and deploy it with Docker, create a Dockerfile on your app’s root listing.

Construct Degree

For your Dockerfile, get started through developing the app’s construct level to construct your software:

  1. Use the reputable newest solid Node.js alpine symbol as the bottom symbol for the construct level:
FROM node:18-alpine AS construct
  1. Reproduction the equipment.json and package-lock.json information to the container:
COPY equipment*.json ./
  1. Set up the app dependencies with:
RUN npm ci
  1. Reproduction the remainder of the applying code to the container with:
COPY . .
  1. Construct the applying:
RUN npm run construct

Runtime Degree

Create the runtime level to deploy your software:

  1. Use the reputable newest solid Node.js alpine symbol as the bottom symbol for the runtime level:
FROM node:18-alpine AS runtime
  1. Set the running listing to /app:
  1. Reproduction the equipment.json and package-lock.json information to the container:
COPY equipment*.json ./
  1. Set up solely manufacturing dependencies:
RUN npm ci --only=manufacturing
  1. Reproduction the constructed app from the construct level to the runtime level:
COPY --from=construct /app/.subsequent ./.subsequent
  1. Reproduction the general public folder from the code>construct level to the runtime level:
COPY --from=construct /app/public ./public
  1. Reveal port 3000:
  1. Run the container as an unprivileged consumer:
USER node
  1. Get started the Subsequent.js app:
CMD ["npm", "start"]

We finally end up with the next Dockerfile:

FROM node:18-alpine AS construct

COPY equipment*.json ./
RUN npm ci
COPY . .
RUN npm run construct

FROM node:18-alpine AS runtime

COPY equipment*.json ./
RUN npm ci --only=manufacturing
COPY --from=construct /app/.subsequent ./.subsequent
COPY --from=construct /app/public ./public

USER node
CMD ["npm", "start"]

Deploy the App In the community With Docker

Even if you’ll nonetheless preview your software with run npm dev, run it in the community with Docker to imitate the manufacturing atmosphere and to check and preview any adjustments you are making on your app’s Dockerfile.

To preview your software:

  1. Construct the app with docker construct:
docker construct -t next-docker .
  1. Run the container to preview your app:
docker run -p 3000:3000 next-docker
  1. To your browser, open http://localhost:3000.

Deploy the Containerized Subsequent.js App to Kinsta

Observe the stairs under to deploy your software to Kinsta the use of its Dockerfile.

  1. Host your app’s codebase on a Git repository (on GitHub, GitLab, or Bitbucket).
  2. Log into your MyKinsta account or create a brand new one to get admission to your dashboard.
  3. Click on Upload carrier and make a selection Software.
  4. Make a selection your Git supplier, repository, and the department you need to deploy from.
  5. Take a look at the Computerized deployment on dedicate checkbox in case you’d love to deploy your app at each and every push on your repo.
  6. Make a selection the information middle closest on your target market and click on Proceed.
  7. Select your construct atmosphere and make a selection Use Dockerfile to arrange container symbol.
  8. In case your Dockerfile isn’t on your repo’s root, use Context to suggest its trail and click on Proceed.
  9. You’ll go away the Get started command access empty. Kinsta makes use of npm get started to start out your software.
  10. Make a selection the pod measurement and selection of circumstances best possible suited in your app and click on Proceed.
  11. Fill out your bank card data and click on Create software.

Your software is able for deployment. Should you checked the checkbox Computerized deployment on dedicate on step 5, Kinsta begins the deployment routinely.


On this article, we mentioned a couple of benefits of the use of Docker over conventional fashions; we defined how you can create a Dockerfile for a Subsequent.js app, construct and deploy it with Docker in the community, and deploy it to Kinsta.

Kinsta’s software internet hosting makes your building workflow easy and environment friendly.

Options comparable to containerized apps on GCP infrastructure operating on C2 machines with 35 information facilities to be had, top rate integration with Cloudflare for a high-performance CDN that serves your web page from 260+ Issues of Presence, enterprise-level firewall DDoS coverage, Edge Caching, and uptime tracking (with 99% uptime ensure), ensure that your app runs rapid, safe, and is reliably to be had to the web.

The publish How To Containerize a Subsequent.js App and Deploy to Kinsta gave the impression first on Kinsta®.

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