Daniel Volz
aa92bcd96d
Redirect NGINX_ENVSUBST_OUTPUT_DIR to /tmp and update nginx.conf include path so envsubst works with read_only: true in docker-compose. Add tmpfs mount for /etc/nginx/conf.d for additional write layer.
55 lines
2.1 KiB
Docker
55 lines
2.1 KiB
Docker
# =============================================================================
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# FRONTEND DOCKERFILE - Security Hardened
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# =============================================================================
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# Security measures applied:
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# - Non-root user execution (nginx user)
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# - Multi-stage build (minimal runtime)
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# - Read-only filesystem compatible
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# - No unnecessary packages
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# - Specific image versions pinned
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# - Unprivileged nginx configuration
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# =============================================================================
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# -----------------------------------------------------------------------------
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# Stage 1: Builder
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# -----------------------------------------------------------------------------
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FROM node:22-slim AS builder
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WORKDIR /app
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# Install dependencies first (better layer caching)
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COPY package.json package-lock.json* ./
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RUN npm ci --ignore-scripts
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# Copy source and build
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COPY tsconfig.json tsconfig.node.json vite.config.ts index.html ./
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COPY src ./src
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COPY public ./public
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RUN npm run build
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# -----------------------------------------------------------------------------
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# Stage 2: Production Runtime (nginx unprivileged)
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# -----------------------------------------------------------------------------
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FROM nginxinc/nginx-unprivileged:1.27-alpine AS runner
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# Redirect envsubst output to /tmp (writable under read_only: true)
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# and update nginx main config to include from there instead of /etc/nginx/conf.d/
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ENV NGINX_ENVSUBST_OUTPUT_DIR=/tmp
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RUN sed -i 's|include /etc/nginx/conf.d/\*.conf;|include /tmp/default.conf;|' /etc/nginx/nginx.conf
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# Copy custom nginx config as template for envsubst processing
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# nginx-unprivileged automatically substitutes env vars in .template files
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COPY nginx.conf /etc/nginx/templates/default.conf.template
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# Copy built static files with correct ownership (nginx user = uid 101)
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COPY --from=builder --chown=101:101 /app/dist /usr/share/nginx/html
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# nginx-unprivileged listens on 8080 by default
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EXPOSE 8080
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# Already runs as non-root (nginx user, uid 101)
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USER nginx
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# Start nginx (entrypoint processes templates automatically)
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CMD ["nginx", "-g", "daemon off;"]
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