Light1YT
b77e856d89
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Docker auto-sets HOSTNAME to the container id; Next standalone's server.js binds process.env.HOSTNAME, so it listened on the container hostname and the compose healthcheck (TCP 127.0.0.1:3000) was refused → frontend container chronically "(unhealthy)" (cosmetic: Caddy reaches it by service name and the site serves 200). Pin HOSTNAME=0.0.0.0 — the canonical Next.js Docker fix. Diagnosed on prod 2026-06-05.
48 lines
1.6 KiB
Docker
48 lines
1.6 KiB
Docker
# syntax=docker/dockerfile:1.7
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# ---- deps ----
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FROM node:20-alpine AS deps
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WORKDIR /app
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COPY package.json package-lock.json ./
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# --legacy-peer-deps: Tailwind 4 alpha + React 19 peer-dep mismatches.
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RUN --mount=type=cache,target=/root/.npm \
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npm ci --legacy-peer-deps --no-audit --no-fund
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# ---- builder ----
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FROM node:20-alpine AS builder
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WORKDIR /app
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ENV NEXT_TELEMETRY_DISABLED=1
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# NEXT_PUBLIC_* must be present at `npm run build` — Next.js inlines them into
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# the client bundle. Defaults to empty so local `docker build` без build-args не ломается.
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ARG NEXT_PUBLIC_GLITCHTIP_DSN=
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ARG NEXT_PUBLIC_ENVIRONMENT=production
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ENV NEXT_PUBLIC_GLITCHTIP_DSN=$NEXT_PUBLIC_GLITCHTIP_DSN
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ENV NEXT_PUBLIC_ENVIRONMENT=$NEXT_PUBLIC_ENVIRONMENT
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COPY --from=deps /app/node_modules ./node_modules
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COPY . .
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RUN npm run build
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# ---- runner ----
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FROM node:20-alpine AS runner
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WORKDIR /app
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# Next.js standalone server.js binds to `process.env.HOSTNAME || '0.0.0.0'`.
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# Docker auto-sets HOSTNAME to the container id, so without this the server binds
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# that hostname and the compose healthcheck (TCP 127.0.0.1:3000) is refused →
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# container shows "(unhealthy)" although it serves fine via Caddy (service name).
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# Pin 0.0.0.0 so it listens on all interfaces and the healthcheck connects.
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ENV NODE_ENV=production \
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NEXT_TELEMETRY_DISABLED=1 \
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PORT=3000 \
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HOSTNAME=0.0.0.0
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# `node` user (uid 1000) ships with the alpine image.
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COPY --from=builder --chown=node:node /app/public ./public
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COPY --from=builder --chown=node:node /app/.next/standalone ./
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COPY --from=builder --chown=node:node /app/.next/static ./.next/static
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USER node
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EXPOSE 3000
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CMD ["node", "server.js"]
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