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+---
+title: Egor Chebkasov
+date: 2025-03-01 0:00:00
+
+featured_img: /img/contributors/egor-chebkasov.jpeg
+
+links:
+    github: https://github.com/riiji
+    linkedin: https://www.linkedin.com/in/egor-chebkasov/
+---
+
+Egor is a software dev. Loves to cook
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+---
+title: Build an effective image with Node.js
+lastmod: 2025-03-01T00:00:00-00:00
+publishdate: 2025-03-01T02:00:00-00:00
+author: Egor Chebkasov
+draft: false
+description: Learn techniques for creating efficient, secure, and more production-ready Docker images with Node.js
+tags: 
+    - docker
+    - node
+    - security
+    - devops
+
+youtube: 
+github: https://github.com/fireship-io/docker-nodejs-advanced-demo
+# disable_toc: true
+# disable_qna: true
+
+# courses
+# step: 0
+
+# versions:
+#    rxdart: 0.20
+---
+
+Building on our [Docker Basics Tutorial](/lessons/docker-basics-tutorial-nodejs/), this guide shows you how to create better Docker images for Node.js apps.
+
+## The Problem with Basic Docker Images
+
+Let's look at a simple Dockerfile that many developers start with. It works fine for learning, but has some problems we should fix:
+
+{{< file "docker" "Dockerfile" >}}
+```docker
+FROM node:22
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm install
+COPY . .
+CMD ["node", "server.js"]
+```
+
+This works for development, but has several issues for production:
+
+1. **Security vulnerabilities** - `npm install` includes dev dependencies that might have security problems
+2. **Unreliable dependencies' code** - `npm install` might update packages beyond what's in package-lock.json, which can break your app
+3. **Large image size** - Dev dependencies make the image much bigger than needed
+4. **Huge base image** - node:22 is very large, making deployments slow and expensive
+
+### Base image improvements
+
+First, the base image is too big:
+
+```docker
+FROM node:22
+```
+
+We can use Alpine Linux instead, which is much smaller:
+
+```docker
+FROM node:22-alpine
+```
+
+Google offers "distroless" images that contain only what you need to run your app - nothing else. This gives you better security. The size difference between Alpine and distroless is small so you shouldn't think about it too much.
+
+Please, don't overengineer. Distroless is what big companies like Google use, but for most projects, Alpine works great. Distroless images make debugging harder since they have no tools inside them.
+
+```docker
+FROM gcr.io/distroless/nodejs22-debian12
+```
+
+### npm install issues
+
+This line causes many problems:
+
+```docker
+npm install
+```
+
+A better approach is using `npm ci`, which uses exactly what's in package-lock.json. It won't try to update packages.
+Adding `--omit=dev` removes development tools like eslint and testing libraries. We only keep what the app needs to run:
+
+```docker
+npm ci --omit=dev
+```
+
+Here's our improved image:
+
+{{< file "docker" "Dockerfile" >}}
+```docker
+FROM node:22-alpine
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+COPY . .
+CMD ["node", "server.js"]
+```
+
+Now let's try the best practice approach with distroless images.
+We need a multi-stage build because distroless images don't have tools like npm:
+
+{{< file "docker" "Dockerfile" >}}
+```docker
+FROM node:22-alpine AS dependencies
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+COPY . .
+
+FROM gcr.io/distroless/nodejs22-debian12
+WORKDIR /app
+COPY --from=dependencies --chown=nonroot:nonroot /app .
+USER nonroot
+CMD ["server.js"]
+```
+
+### Non-root user for better security
+
+Notice the USER nonroot line. This is an important security practice - by default, Docker runs as root, which creates a security risk. Distroless images come with a nonroot user built-in, making it easy to follow this best practice with just one line of code.
+
+
+## Let's look at the results
+
+I tested these approaches with a real Node.js app:
+
+| Image Type | Size |
+|------------|------|
+| Basic | 1.18GB |
+| Alpine | 170MB |
+| Distroless | 162MB |
+
+The difference is huge! Image size matters because your servers need to download these images. Smaller images mean faster deployments and less storage costs. 
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