Fix: Refactor Docker build process #325
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This commit refactors the Docker build process to follow best practices and resolve build failures. The key changes include: - Rewriting the Dockerfile to use a multi-stage build, which improves caching and reduces image size. - Adding a .dockerignore file to exclude node_modules and other unnecessary files from the build context. - Removing a circular dependency from package.json that was causing an infinite loop during the build. - Updating the CMD instruction to correctly start the development server and expose it to the host machine.
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The Dockerfile references bun.lock, but the repository uses bun.lockb, which will likely break builds; use bun.lockb and freeze installs for reproducibility. The runtime stage copies node_modules from the builder, inflating image size—prefer a production-only install or Next.js standalone output. Consider adding EXPOSE 3000, NODE_ENV=production, and running as a non-root user for better security and operability. The .dockerignore should also exclude .next and other build artifacts to prevent leaking local state into images.
Additional notes (1)
- Maintainability |
.dockerignore:1-16
It’s easy to accidentally include local build artifacts in the image (e.g.,.nextfrom a previous local build). Excluding these improves cache efficiency and prevents polluting the builder context.
Summary of changes
- Introduced a multi-stage Docker build using
oven/bun:1.2.12with separate builder and runner stages. - Optimized dependency installation by copying
package.jsonand a lockfile prior tobun installfor better caching. - Copied only build artifacts and selected files into the runtime image, and updated the container
CMDto start the app bound to0.0.0.0. - Added a new
.dockerignoreto exclude development files from the build context. - Removed the circular
"QCX": "."dependency frompackage.json.
| # Install dependencies (separated for better cache utilization) | ||
| COPY package.json bun.lock ./ | ||
| RUN bun install | ||
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The lockfile copied/used here is bun.lock, but this repository appears to use bun.lockb (binary). This will break build caching and can fail the build if bun.lock doesn’t exist. Use bun.lockb and enable a frozen install for reproducible builds.
Suggestion
Replace the lockfile and harden installs:
# Install dependencies (separated for better cache utilization)
COPY package.json bun.lockb ./
RUN bun install --frozen-lockfileReply with "@CharlieHelps yes please" if you'd like me to add a commit with this suggestion.
| COPY --from=builder /app/public ./public | ||
| COPY --from=builder /app/package.json ./package.json | ||
| COPY --from=builder /app/bun.lock ./bun.lock | ||
| COPY --from=builder /app/node_modules ./node_modules |
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Copying the entire node_modules from the builder bloats the runtime image and defeats much of the value of a multi-stage build. Prefer a production-only install in the runner (using package.json + bun.lockb) or leverage Next.js output: 'standalone' to eliminate most runtime deps.
Suggestion
Minimize runtime image size by installing only production deps in the runner:
# Runtime stage
FROM oven/bun:1.2.12 AS runner
WORKDIR /app
# Only what's needed to install runtime deps
COPY --from=builder /app/package.json ./package.json
COPY --from=builder /app/bun.lockb ./bun.lockb
RUN bun install --frozen-lockfile --production
# App artifacts
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
# Optional hardening
ENV NODE_ENV=production
EXPOSE 3000
CMD ["bun", "run", "start", "--", "-H", "0.0.0.0"]Alternatively, configure Next.js with output: 'standalone' and copy the .next/standalone directory to further reduce size.
Reply with "@CharlieHelps yes please" if you'd like me to add a commit with this suggestion.
| FROM oven/bun:1.2.12 AS runner | ||
| WORKDIR /app | ||
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| # Copy only necessary files from builder | ||
| COPY --from=builder /app/.next ./.next | ||
| COPY --from=builder /app/public ./public | ||
| COPY --from=builder /app/package.json ./package.json | ||
| COPY --from=builder /app/bun.lock ./bun.lock | ||
| COPY --from=builder /app/node_modules ./node_modules | ||
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| # Set the default command | ||
| CMD ["bun", "dev"] | ||
| # Start production server | ||
| CMD ["bun", "start", "-H", "0.0.0.0"] |
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Consider running the container as a non-root user to reduce risk in production. The Bun image typically includes a bun user; switching to it in the runner stage is a low-effort hardening step.
Suggestion
Switch to a non-root user in the runner stage:
# After copying files in runner stage, before CMD
USER bunReply with "@CharlieHelps yes please" if you'd like me to add a commit with this suggestion.
2 participants
User description
This change fixes the Docker build process by refactoring the Dockerfile, adding a .dockerignore file, and removing a circular dependency in package.json.
PR created automatically by Jules for task 372084537545250861
PR Type
Bug fix, Enhancement
Description
Refactor Dockerfile to use multi-stage build pattern
Add .dockerignore file to optimize build context
Remove circular dependency from package.json
Update Docker configuration for production deployment
Diagram Walkthrough
File Walkthrough
.dockerignore
Add .dockerignore for build optimization.dockerignore
Dockerfile
Refactor to multi-stage Docker buildDockerfile
package.json
Remove circular dependency from dependenciespackage.json