healthcheck.cjs

#!/usr/bin/env node

(async () => {
  const response = await fetch("http://localhost:3000/api/ping");
  const result = await response.text();

  if (!response.ok) {
    throw new Error(`Healthcheck failed: ${response.status}`);
  } else if (result !== "pong") {
    throw new Error(`Healthcheck failed: ${result} !== pong`);
  } else {
    console.info("\x1b[32m", "Healthcheck passed", "\x1b[0m");
  }
})().catch((error) => {
  console.error(error.message);
  process.exit(1);
});

next-mono.dockerfile

FROM docker.io/library/node:22-bookworm AS base
ENV CI="true" PNPM_HOME="/opt/pnpm" PATH="/opt/pnpm:$PATH"
RUN corepack enable pnpm
WORKDIR /app


FROM base AS preprocess
COPY . /app
RUN --mount=type=cache,id=pnpm,target=/opt/pnpm/store <<EOF
    turbo_version=$(node -p "require('./package.json').devDependencies.turbo")
    pnpm install --global "turbo@${turbo_version}"
EOF
RUN turbo prune web --docker


FROM base AS builder
COPY --from=preprocess /app/out/json /app
RUN --mount=type=cache,id=pnpm,target=/opt/pnpm/store \
    pnpm install --frozen-lockfile
COPY --from=preprocess /app/out/full /app
RUN pnpm run build --filter=web


FROM gcr.io/distroless/nodejs22-debian12

COPY --from=builder /app/apps/web/.next/standalone /app
COPY --from=builder /app/apps/web/.next/static /app/apps/web/.next/static
COPY --from=builder /app/apps/web/public /app/apps/web/public

ENV HOSTNAME="0.0.0.0" PORT="3000"

EXPOSE 3000

CMD ["/app/apps/web/server.js"]

COPY --from=preprocess /app/scripts/healthcheck.cjs /app/healthcheck.cjs
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD ["/nodejs/bin/node", "/app/healthcheck.cjs"]