How To Containerize a Subsequent.js App and Deploy to Kinsta

by | Sep 8, 2023 | Etcetera | 0 comments

This newsletter explains how you’ll be able to containerize a Subsequent.js device with a Dockerfile for a customizable deployment. Alternatively, you’ll deploy a Subsequent.js app to Kinsta the use of automated deployment.

With Docker, we apparatus an device, its environment, and its dependencies into an isolated container. A container consists of an device working in a Linux stripped-down type. A Docker image is the blueprint for a container, and the container is a working instance of an image.

To containerize an device, we use a declarative method by the use of a Dockerfile. Docker reads and executes the scripts defined in this report to build and deploy your device.

Advantages of Containerizing Your Tool

You’ll have a large number of benefits from containerizing an device, similar to portability, balance, scalability, protection, and serve as. By means of deploying an app to Kinsta with a Dockerfile, you moreover leverage its customizability.


Docker encapsulates the whole thing an device should run, permitting them to be commuted merely between environments. Whether or not or no longer you could be working it in the neighborhood, on a computer with a singular working software, or in staging and production environments, Docker builds the application with the identical parts, making it more uncomplicated to code, test, and deploy.


With Docker, you’ll run quite a lot of cases of your container on different servers. Container orchestrators handle better website online guests without affecting your app’s capability.


By means of working your app in an isolated container, you’ve were given predictable results when moving code between development, test, and production strategies. Given that your container incorporates exact diversifications of vital libraries and techniques, it minimizes the risk of bugs on account of different dependency revisions.

Moreover, when your app is deployed to a producing server, Docker keeps it isolated from other programs, minimizing the risk of being affected by their website online guests spikes.


Docker bins provide a additional secure environment to your workloads than standard models. As they break up your programs into so much smaller, loosely coupled parts, each and every isolated from one another, there’s a significantly reduced attack ground. Docker bins decrease the chance for hackers to exploit your pc strategies and make it more difficult for a breach to spread throughout the match of an attack. Be informed additional in this article: 9 Safety Easiest Practices for Docker Boxes.

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Packing containers don’t come with a whole working software like virtual machines and traditional servers. With that, bins have a considerably smaller footprint and are faster to construct and get began.

Custom designed Deployment

With Kinsta, you’ll deploy your programs automatically thru using Buildpacks and Nixpacks. But when the assemble process is automatically introduced on in line with your app’s codebase, you don’t have a large number of room for customizations. Will have to you deploy to Kinsta with a Dockerfile, you’ll configure precisely how you wish to have to build and deploy your device.


To deploy a Subsequent.js device with Docker, you need:

Get began With a Next.js Tool

If you are starting from an present device, you’ll skip this step. If you are starting recent, create a brand spanking new Next.js device:

  1. Open your terminal and arrange create-next-app:
npm i -g create-next-app@latest
  1. Navigate to the record where you wish to have to place in it and create a brand spanking new Next.js device in its private record:
npx create-next-app@latest new-app

Next turns on you to specify numerous configuration alternatives to your new app. For this tutorial, you’ll simply accept the advisable defaults.

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

For your reference, we created an instance software using the program.

Containerize a Next.js App With a Dockerfile

To containerize your Next.js device and deploy it with Docker, create a Dockerfile to your app’s root record.

Assemble Level

On your Dockerfile, get began thru creating the app’s assemble point to build your device:

  1. Use the respected latest cast Node.js alpine image as the ground image for the assemble point:
FROM node:18-alpine AS assemble
  1. Copy the apparatus.json and package-lock.json data to the container:
COPY apparatus*.json ./
  1. Arrange the app dependencies with:
RUN npm ci
  1. Copy the rest of the application code to the container with:
COPY . .
  1. Assemble the application:
RUN npm run assemble

Runtime Level

Create the runtime point to deploy your device:

  1. Use the respected latest cast Node.js alpine image as the ground image for the runtime point:
FROM node:18-alpine AS runtime
  1. Set the working record to /app:
  1. Copy the apparatus.json and package-lock.json data to the container:
COPY apparatus*.json ./
  1. Arrange only production dependencies:
RUN npm ci --only=production
  1. Copy the built app from the assemble point to the runtime point:
COPY --from=assemble /app/.next ./.next
  1. Copy most people folder from the code>assemble point to the runtime point:
COPY --from=assemble /app/public ./public
  1. Disclose port 3000:
  1. Run the container as an unprivileged client:
USER node
  1. Get began the Next.js app:
CMD ["npm", "start"]

We after all finally end up with the following Dockerfile:

FROM node:18-alpine AS assemble

COPY apparatus*.json ./
RUN npm ci
COPY . .
RUN npm run assemble

FROM node:18-alpine AS runtime

COPY apparatus*.json ./
RUN npm ci --only=production
COPY --from=assemble /app/.next ./.next
COPY --from=assemble /app/public ./public

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

Deploy the App In the neighborhood With Docker

Even supposing you’ll nevertheless preview your device with run npm dev, run it in the neighborhood with Docker to mimic the producing environment and to test and preview any changes you’re making to your app’s Dockerfile.

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To preview your device:

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

Deploy the Containerized Next.js App to Kinsta

Practice the steps beneath to deploy your device to Kinsta using 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 entry to your dashboard.
  3. Click on on Add provider and choose Tool.
  4. Choose your Git provider, repository, and the dept you wish to have to deploy from.
  5. Check out the Automatic deployment on devote checkbox if you’d like to deploy your app at each push to your repo.
  6. Choose the tips center closest to your audience and click on on Continue.
  7. Choose your assemble environment and choose Use Dockerfile to prepare container image.
  8. If your Dockerfile isn’t to your repo’s root, use Context to signify its path and click on on Continue.
  9. You’ll pass away the Get began command get admission to empty. Kinsta uses npm get began to begin out your device.
  10. Choose the pod size and number of cases easiest imaginable suited to your app and click on on Continue.
  11. Fill out your credit card knowledge and click on on Create device.

Your device is in a position for deployment. Will have to you checked the checkbox Automatic deployment on devote on step 5, Kinsta starts the deployment automatically.


In this article, we discussed a few advantages of using Docker over standard models; we outlined how you’ll be able to create a Dockerfile for a Next.js app, assemble and deploy it with Docker in the neighborhood, and deploy it to Kinsta.

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Kinsta’s software internet hosting makes your development workflow simple and atmosphere pleasant.

Choices similar to containerized apps on GCP infrastructure working on C2 machines with 35 data amenities available, most sensible charge integration with Cloudflare for a high-performance CDN that serves your internet web page from 260+ Problems with Presence, enterprise-level firewall DDoS protection, Edge Caching, and uptime monitoring (with 99% uptime be sure), make certain that your app runs speedy, secure, and is reliably available to the internet.

The put up How To Containerize a Subsequent.js App and Deploy to Kinsta seemed first on Kinsta®.

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