Feat: dockerfile to build the app #632
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WalkthroughAdds Docker support via a two-stage Dockerfile (build + runtime), provides Docker-related guidance in Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant Dev as Developer / CI
participant Docker as Docker Engine
participant Builder as Builder Image (node:22-alpine)
participant Runtime as Runtime Image (node:22-alpine)
note over Dev,Docker #f0f4c3: Build phase
Dev->>Docker: docker build (Dockerfile)
Docker->>Builder: create builder stage
Builder->>Builder: install pnpm & deps\nrun pnpm build -> .output
note over Docker,Runtime #e3f2fd: Assemble runtime
Docker->>Runtime: copy .output, configs, .env
note over Docker,Runtime #c8e6c9: Run phase
Dev->>Docker: docker run -d -p 3000:3000 ...
Docker->>Runtime: start container (pnpm start)
Runtime->>Runtime: app listens on 0.0.0.0:3000
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
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🧹 Nitpick comments (3)
Dockerfile (3)
6-10: Combine consecutiveRUNcommands to reduce image layers.Multiple single-line
RUNcommands create extra layers. Consider grouping related operations:
- Lines 8–10: Combine
apk update,apk upgrade, andapk add gitinto one command.- Lines 37–38: Combine pnpm and npm-run-all installations in the runtime stage.
# install pnpm & git -RUN npm install -g pnpm -RUN apk update && \ - apk upgrade && \ - apk add --no-cache git +RUN npm install -g pnpm && \ + apk update && \ + apk upgrade && \ + apk add --no-cache gitAnd in the runtime stage:
# install pnpm -RUN npm install -g pnpm -RUN npm install -g npm-run-all +RUN npm install -g pnpm npm-run-allAlso applies to: 37-38
2-2: Consider running the container as a non-root user for security.Both the builder and runtime stages run as the root user by default. This increases the attack surface if the container is compromised. Add a non-root user (e.g.,
nodeor a custom user) to each stage:# Stage 1: builder FROM node:22-alpine AS builder WORKDIR /app +# Create non-root user for build +RUN addgroup -g 1001 -S nodejs && \ + adduser -S nodejs -u 1001 + # install pnpm & git RUN npm install -g pnpm RUN apk update && \ apk upgrade && \ apk add --no-cache git RUN git init # copy lock, package files and configs COPY package.json pnpm-lock.yaml ./ COPY run-jiti.js ./ COPY src/features/build-info/script-to-generate-json.ts src/features/build-info/build-info.gen.json ./src/features/build-info/ COPY prisma/schema.prisma ./prisma/ +USER nodejs RUN pnpm install --frozen-lockfile --prod=false # copy source COPY . . # build .output ENV NODE_OPTIONS=--max-old-space-size=4096 RUN pnpm build # Stage 2: runtime FROM node:22-alpine AS runtime +# Create non-root user for runtime +RUN addgroup -g 1001 -S nodejs && \ + adduser -S nodejs -u 1001 WORKDIR /app # install pnpm RUN npm install -g pnpm RUN npm install -g npm-run-all ## copy output build and package.json from builder COPY --from=builder /app/.output ./.output COPY --from=builder /app/package.json ./package.json COPY --from=builder /app/src/features/build-info/build-info.gen.json ./src/features/build-info/build-info.gen.json COPY --from=builder /app/src/features/build-info/script-to-generate-json.ts ./src/features/build-info/script-to-generate-json.ts +RUN chown -R nodejs:nodejs /app # install only production dependencies +USER nodejs RUN pnpm install --prodAlso applies to: 31-31, 52-60
41-41: Fix comment formatting.Line 41 uses
##(two hashes) instead of the conventional single#for comments:-## copy output build and package.json from builder +# copy output build and package.json from builder
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Dockerfile (2)
12-12: Clarify the purpose ofgit initin the builder stage.Line 12 initializes a git repository, but it's unclear why this is needed since no
.gitdirectory or git commands appear afterward. If this is unused, it should be removed to keep the image lean.Can you explain the purpose of
git init? If it's not needed for the build process, I recommend removing it to reduce layer overhead.
37-38: Verify thatnpm-run-allis actually required.Line 38 installs
npm-run-allglobally in the runtime stage, but theCMD(line 60) only runspnpm startwithout any indication that npm-run-all is used. If it's not needed by the startup script or your application, removing it will reduce image size.Can you confirm whether
npm-run-allis needed at runtime, or if it can be safely removed?Also applies to: 60-60
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🧹 Nitpick comments (3)
Dockerfile (3)
7-7: Prefer corepack over npm install for pnpm management.Node.js 22 includes
corepack, a built-in package manager that can manage pnpm without explicitly installing it. Using corepack is more maintainable and follows Node.js ecosystem best practices.Apply this diff to use corepack in both stages:
-# install pnpm & git -RUN npm install -g pnpm +# install git RUN apk update && \ - apk upgrade && \ apk add --no-cache gitAnd in the runtime stage:
-# install pnpm -RUN npm install -g pnpm npm-run-all +# enable corepack +RUN corepack enable && \ + npm install -g npm-run-allThen ensure your
package.jsonhas a"packageManager"field like:{ "packageManager": "[email protected]" }Also applies to: 37-37
8-10: Remove apk upgrade from multi-stage build for better layer caching.
apk upgradein a Docker layer can cause cache invalidation issues and is unnecessary when you're only adding specific packages. Useapk add --no-cachealone to ensure reproducible builds and better caching.Apply this diff to simplify the apk installation:
-RUN apk update && \ - apk upgrade && \ +RUN apk add --no-cache gitThis removes the redundant
apk updateandapk upgradecalls.
26-26: Consider whether NODE_OPTIONS should also apply to the runtime stage.
NODE_OPTIONS=--max-old-space-size=4096is set in the builder stage (line 26) to help with memory during the build, but it only takes effect during build time. If your production application needs this setting, ensure it's also set in the runtime stage (after line 49).If the setting is needed for runtime, add it to the runtime stage:
ENV NODE_ENV=production +ENV NODE_OPTIONS=--max-old-space-size=4096 ENV HOST=0.0.0.0 ENV PORT=3000
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♻️ Duplicate comments (3)
Dockerfile (3)
12-12:⚠️ Duplicate:git initremains unnecessary and should be removed.This issue was previously flagged as critical. When launching containers, networks must be created explicitly; Docker does not auto-create custom networks. The
git initcommand initializes a repository that is never used and adds unnecessary build overhead. No build scripts, pnpm commands, or dependencies require a.gitdirectory.Apply this diff to remove the line:
RUN apk update && \ apk upgrade && \ apk add --no-cache git -RUN git init
46-46:⚠️ Duplicate: Do not copy.envinto the Docker image — critical security risk.This issue was previously flagged as critical. Copying environment files into the image bakes secrets into image layers permanently, making them available to anyone with image access. This violates security best practices.
Environment configuration should be injected at runtime via:
- Environment variable flags (
docker run -e)- Bind mounts or volumes
- Secret management systems (Docker Secrets, Kubernetes Secrets, CI/CD injection)
Apply this diff to remove the line:
RUN npm install -g pnpm npm-run-all -COPY .env ./
50-54:⚠️ Duplicate: Avoid copyingnode_modulesfrom builder to runtime — platform incompatibility risk.This issue was previously flagged as major. Copying compiled
node_modulesacross stages can cause runtime failures if native modules (bcrypt, sharp, etc.) were compiled for the builder's platform and don't match the runtime environment.Reinstall dependencies in the runtime stage using the frozen lockfile instead:
-## copy output build and package.json from builder COPY --from=builder /app/.output ./.output COPY --from=builder /app/package.json ./package.json COPY --from=builder /app/pnpm-lock.yaml ./pnpm-lock.yaml -COPY --from=builder /app/node_modules ./node_modules + +RUN pnpm install --frozen-lockfile --prodThis ensures dependencies are properly compiled for the runtime environment.
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package.json
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| "dk:start": "docker compose start", | ||
| "dk:stop": "docker compose stop", | ||
| "dk:clear": "docker compose down --volumes", | ||
| "dk:build": "docker build -t start-ui-web . && docker run -d --network start-ui-web_default -p 3000:3000 --name start-ui-web-container start-ui-web", |
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The idea is to build a Docker image to deploy on some Docker running platform like k8s, we don't really want a script in package.json but more of a command to copy/paste in the README (just the docker build -t start-ui-web . part I think, and then how to use this built docker image
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tell me if in the readme.md section Dockerfile, the description and command match with your suggestion
| ENV PORT=3000 | ||
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| # install pnpm | ||
| RUN npm install -g pnpm npm-run-all |
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Why is npm-run-all needed?
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run-p not found if I don't install npm run all
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README.md (1)
70-70: Clarify .env file prerequisites and timing.The note about the .env file is helpful but doesn't specify whether the file must be created before running
docker build. Add context to prevent build failures from missing environment variables.Apply this diff for clarity:
-During the build process, it automatically uses your project's .env file. +> [!NOTE] +> Ensure your `.env` file exists and is properly configured in the project root before running `docker build`. The Docker build process will copy and use it to configure the application.
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