INCIDENT RUNBOOK

Fix: Database Pool Exhaustion Edge in Astro on Docker

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

Automated Remediation ProtocolUpdated for 2026 Production

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● Observed Terminal Error / Stack Trace

Error: Database pool exhausted
    at Pool.<anonymous> (/app/node_modules/pg/lib/index.js:195:18)
    at Pool.EventEmitter.emit (events.js:400:28)
    at Pool.emit (node:internal/process/promises:136:22)
    at /app/node_modules/pg/lib/index.js:210:12

Root Cause Analysis

The Astro framework, when deployed on Docker, experiences database pool exhaustion due to a mismatch in the connection pooling strategy. By default, Astro uses a connection pooling mechanism to manage database connections. However, when deployed in a containerized environment like Docker, the pooling strategy can lead to exhaustion of available connections, resulting in errors. This is because the container's resource constraints and the database's connection limits are not properly aligned, causing the pool to be depleted rapidly.

● Configuration & Code Resolution

To resolve this issue, update the `astro.config.js` file to include the following configuration:
--- a/astro.config.js
+++ b/astro.config.js
@@ -1,6 +1,10 @@
 module.exports = {
   //...
+  database: {
+    connection: {
+      pool: {
+        min: 1,
+        max: 10
+      }
+    }
+  }
 };
And update the `docker-compose.yml` file to include the following configuration:
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,10 @@
 version: '3'
 services:
   astro:
     //...
+    environment:
+      - DATABASE_POOL_MIN=1
+      - DATABASE_POOL_MAX=10
``

Verification & Build Command

docker-compose up --build && docker exec -it astro npm run test