Fix docker to work with custom server

Author: DamianEdwards

src/BenchmarksApps/TechEmpower/nextjs/Dockerfile

@@ -42,12 +42,11 @@ ENV NEXT_TELEMETRY_DISABLED 1
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs
 
-COPY --from=builder /app/public ./public
-
-# Automatically leverage output traces to reduce image size
-# https://nextjs.org/docs/advanced-features/output-file-tracing
-COPY --from=builder --chown=nextjs:nodejs /app/dist ./dist
+# Copy files required to run the app
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/dist/server.js ./cluster.js
 
 USER nextjs
 
@@ -56,4 +55,4 @@ EXPOSE 3000
 ENV PORT 3000
 ENV DB_HOST postgres_te
 
-CMD ["node", "dist/server.js"]
+CMD ["node", "cluster.js"]

src/BenchmarksApps/TechEmpower/nextjs/next.config.js

@@ -1,4 +1,5 @@
 /** @type {import('next').NextConfig} */
 module.exports = {
+  output: "standalone",
   reactStrictMode: true,
 }

src/BenchmarksApps/TechEmpower/nextjs/server.ts

@@ -1,41 +1,71 @@
 import cluster from 'node:cluster';
 import process from 'node:process';
 import os from 'node:os';
+import fs from 'node:fs';
 import { createServer } from 'http';
 import { parse } from 'url';
-import path from 'path';
-import next from 'next';
 
-//console.log("Running custom server.js");
-
-const numCPUs = os.cpus().length;
-const port = parseInt(process.env.PORT || '3000', 10)
 const dev = process.env.NODE_ENV !== 'production'
-const app = next({ dev })
-const handle = app.getRequestHandler()
 
-if (!dev && cluster.isPrimary) {
-  console.log(`Primary ${process.pid} is running`);
-  
-  // Fork workers
-  for (let i = 0; i < numCPUs; i++) {
-    cluster.fork();
+// Make sure commands gracefully respect termination signals (e.g. from Docker)
+// Allow the graceful termination to be manually configurable
+if (!process.env.NEXT_MANUAL_SIG_HANDLE) {
+  process.on('SIGTERM', () => process.exit(0))
+  process.on('SIGINT', () => process.exit(0))
+}
+
+if (!dev) {
+  const servers = ['./.next/standalone/server.js', './server.js'];
+  let server = '';
+
+  for (var i = 0; i < servers.length; i++) {
+    if (fs.existsSync(servers[i])) {
+      server = fs.realpathSync(servers[i]);
+      break;
+    }
   }
 
-  cluster.on('exit', (worker, code, signal) => {
-    console.log(`worker ${worker.process.pid} stopped`, { code, signal });
-  });
+  if (server === '') {
+    console.error('Could not find server.js');
+      process.exit(-1);
+  }
+
+  //console.log(`server.js found at: ${server}`);
+
+  if (cluster.isPrimary) {
+    console.log(`Primary ${process.pid} is running`);
+    
+    const numCPUs = os.cpus().length;
+
+    // Fork workers
+    for (let i = 0; i < numCPUs; i++) {
+      cluster.fork();
+    }
+
+    cluster.on('exit', (worker, code, signal) => {
+      console.log(`worker ${worker.process.pid} stopped`, { code, signal });
+    });
+  } else {
+    require(server);
+  }
 } else {
+  console.log('Development mode');
+
+  const next = require('next');
+  const app = next({ dev });
+  const handle = app.getRequestHandler();
+  const port = parseInt(process.env.PORT || '3000', 10);
+
   app.prepare().then(() => {
     createServer((req, res) => {
       const parsedUrl = parse(req.url!, true)
       handle(req, res, parsedUrl)
-    }).listen(port)
+    }).listen(port);
 
     console.log(
       `> Server listening at http://localhost:${port} as ${
         dev ? 'development' : process.env.NODE_ENV
       }`
-    )
-  })
+    );
+  });
 }