INCIDENT RUNBOOK

Fix: Database Pool Exhaustion Edge in Next.js on Docker

Comprehensive architectural post-mortem and verified configuration patch for next.js deployed in docker production environments.

Automated Remediation ProtocolUpdated for 2026 Production

Facing database-pool-exhaustion-edge in CI/CD or runtime containers?

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● Observed Terminal Error / Stack Trace

Error: await fetchDatabaseConnection() - Error: Connection pool exhausted
    at /app/node_modules/pg/lib/index.js:67:36
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async getServerSideProps (/app/pages/index.js:10:20)
    at async renderPage (/app/node_modules/next/dist/next-server/lib/utils.js:59:15)

Root Cause Analysis

The issue arises from a mismatch between the database connection pool size and the number of concurrent requests handled by the Next.js application running on Docker. As the application scales, the default database connection pool size is exhausted, leading to a shortage of available connections and causing the application to hang or throw errors. This is exacerbated by the fact that Docker containers may be spun up or down rapidly, leading to unpredictable demand on the database connection pool.

● Configuration & Code Resolution

diff --git a/next.config.js b/next.config.js
--- a/next.config.js
+++ b/next.config.js
@@ -1,6 +1,9 @@
 module.exports = {
   //... other configurations...
+  experimental: {
+    externalDir: true,
+  },
+  pg: {
+    connectionLimit: 50,
+    idleTimeoutMillis: 30000,
+  },
 };
diff --git a/docker-compose.yml b/docker-compose.yml
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,6 +10,9 @@
 services:
   app:
     //... other configurations...
+    environment:
+      - PG_CONNECTION_LIMIT=50
+      - PG_IDLE_TIMEOUT_MILLIS=30000

Verification & Build Command

docker-compose up -d && docker exec -it app npm run test && docker exec -it app npm run build && docker exec -it app npm run start