fix: unable to find socket-cleanup when running with docker

Add --max-old-space-size=1024 to the node process running the Next.js
server. This caps V8's old-generation heap at 1024MB, forcing the
garbage collector to run more aggressively as memory usage approaches
the limit.

Previously, users saw Next.js RSS grow to 4GB+. This was caused by a
reference chain that prevented GC from freeing memory:

  AfterContext (vercel/next.js#89091) retained ServerResponse objects
  after client disconnect, which held zlib Transform streams (from
  compress: true), which allocated native C++ buffers outside V8's
  heap entirely — invisible to GC and uncapped by --max-old-space-size.

Combined with the prior commit's fixes (compress: false moves gzip to
nginx, httpBatchLink closes connections faster, socket-cleanup.cjs
destroys zombie CLOSE_WAIT sockets every 60s), GC can now actually
reclaim memory because:

- zlib native buffers no longer exist (compress: false)
- The AfterContext → ServerResponse reference chain is broken by
  socket cleanup destroying the underlying sockets
- The JS heap is capped at 1024MB so V8 GCs more frequently for
  the memory it does control

Also fixes the Dockerfile to copy socket-cleanup.cjs from the builder
stage instead of the host context.

Ref: https://github.com/homarr-labs/homarr/issues/3759

.gitignore

@@ -72,3 +72,5 @@ en.d.json.ts
 # personal agent config
 AGENTS.md
 .opencode
+.claude/CLAUDE.md
+.claude/settings.json

Dockerfile

@@ -52,6 +52,7 @@ COPY --from=builder /app/packages/db/migrations ./db/migrations
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing
 COPY --from=builder /app/apps/nextjs/.next/standalone ./
+COPY --from=builder /app/apps/nextjs/socket-cleanup.cjs ./apps/nextjs/socket-cleanup.cjs
 COPY --from=builder /app/apps/nextjs/.next/static ./apps/nextjs/.next/static
 COPY --from=builder /app/apps/nextjs/public ./apps/nextjs/public
 COPY scripts/run.sh ./run.sh

apps/nextjs/next.config.ts

@@ -19,6 +19,7 @@ const withNextIntl = createNextIntlPlugin({
 
 const nextConfig: NextConfig = {
   output: "standalone",
+  compress: false, // Workaround for vercel/next.js#89091 - zlib retains ServerResponse after client disconnect, causing CLOSE-WAIT socket leak
   reactStrictMode: true,
   // react compiler breaks mantine-react-table, so disabled for now
   //reactCompiler: true,

apps/nextjs/socket-cleanup.cjs

@@ -0,0 +1,26 @@
+// Periodic cleanup of zombie CLOSE-WAIT sockets in Next.js standalone mode.
+// Workaround for vercel/next.js#89091 — AfterContext retains ServerResponse
+// after client disconnect, leaving sockets in CLOSE-WAIT indefinitely.
+//
+// Usage: node --require ./socket-cleanup.cjs server.js
+
+const INTERVAL_MS = 60_000; // Check every 60 seconds
+
+setInterval(() => {
+  let destroyed = 0;
+  for (const handle of process._getActiveHandles()) {
+    if (
+      handle.constructor?.name === "Socket" &&
+      handle.localPort === 3000 &&
+      handle.readyState === "writeOnly" &&
+      !handle._httpMessage &&
+      handle.bytesWritten === 0
+    ) {
+      handle.destroy();
+      destroyed++;
+    }
+  }
+  if (destroyed > 0) {
+    console.log(`[socket-cleanup] Destroyed ${destroyed} zombie socket(s)`);
+  }
+}, INTERVAL_MS).unref(); // unref() so this timer doesn't prevent process exit

apps/nextjs/src/app/[locale]/_client-providers/trpc.tsx

@@ -7,7 +7,7 @@ import { ReactQueryDevtools } from "@tanstack/react-query-devtools";
 import { ReactQueryStreamedHydration } from "@tanstack/react-query-next-experimental";
 import {
   createWSClient,
-  httpBatchStreamLink,
+  httpBatchLink,
   httpLink,
   isNonJsonSerializable,
   loggerLink,
@@ -90,7 +90,7 @@ export function TRPCReactProvider(props: PropsWithChildren) {
               url: getTrpcUrl(),
               headers: createHeadersCallbackForSource("nextjs-react (form-data)"),
             }),
-            false: httpBatchStreamLink({
+            false: httpBatchLink({
               transformer: superjson,
               url: getTrpcUrl(),
               maxURLLength: 2083, // Suggested by tRPC: https://trpc.io/docs/client/links/httpBatchLink#setting-a-maximum-url-length

nginx.conf

@@ -3,6 +3,12 @@ events {
 }
 
 http {
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml text/javascript image/svg+xml;
+    gzip_min_length 1000;
+    gzip_proxied any;
+    gzip_vary on;
+
     server {
         listen 7575;
         listen [::]:7575;

scripts/run.sh

@@ -51,7 +51,7 @@ TASKS_PID=$!
 node apps/websocket/wssServer.cjs &
 WSS_PID=$!
 
-node apps/nextjs/server.js &
+node --max-old-space-size=1024 --require ./apps/nextjs/socket-cleanup.cjs apps/nextjs/server.js &
 NEXTJS_PID=$!
 
 # Function to handle SIGTERM and shut down services