From bbeea1ae247c4fdb4eee73b3614c54f969c882f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9s=20Eduardo=20Garc=C3=ADa=20M=C3=A1rquez?=
 <andresgarcia0313@gmail.com>
Date: Thu, 8 Jan 2026 00:01:39 -0500
Subject: [PATCH] fix(k8s): increase SQL Server memory to prevent OOMKilled

- Increase memory limit from 1Gi to 1.5Gi
- Increase MSSQL_MEMORY_LIMIT_MB from 768 to 1024
- Increase liveness probe initialDelaySeconds to 120
- Increase failureThreshold to 5 for more tolerance
- Increase readiness probe timeouts

Fixes DEF-001: SQL Server was crashing with Exit Code 137 (OOMKilled)
due to insufficient memory allocation for SQL Server 2022 Express.
---
 deploy/k3s/sqlserver.yaml | 42 +++++++++++++++++++++++++++++----------
 1 file changed, 32 insertions(+), 10 deletions(-)

diff --git a/deploy/k3s/sqlserver.yaml b/deploy/k3s/sqlserver.yaml
index 1641bbd..00765ec 100644
--- a/deploy/k3s/sqlserver.yaml
+++ b/deploy/k3s/sqlserver.yaml
@@ -10,7 +10,7 @@ spec:
   storageClassName: local-path
   resources:
     requests:
-      storage: 5Gi
+      storage: 2Gi
 ---
 apiVersion: apps/v1
 kind: Deployment
@@ -31,6 +31,8 @@ spec:
       labels:
         app: sqlserver
     spec:
+      nodeSelector:
+        kubernetes.io/hostname: hp62a
       containers:
         - name: sqlserver
           image: mcr.microsoft.com/mssql/server:2022-latest
@@ -45,26 +47,46 @@ spec:
                 secretKeyRef:
                   name: student-secrets
                   key: db-password
+            # SQL Server Express - Optimización RAM
+            - name: MSSQL_PID
+              value: "Express"
+            - name: MSSQL_MEMORY_LIMIT_MB
+              value: "1024"
+            - name: MSSQL_AGENT_ENABLED
+              value: "false"
           volumeMounts:
             - name: sqlserver-data
               mountPath: /var/opt/mssql
           resources:
             requests:
-              memory: "1Gi"
-              cpu: "500m"
+              memory: "1.2Gi"
+              cpu: "250m"
             limits:
-              memory: "2Gi"
+              memory: "1.5Gi"
               cpu: "1000m"
           livenessProbe:
-            tcpSocket:
-              port: 1433
-            initialDelaySeconds: 30
-            periodSeconds: 10
+            exec:
+              command:
+                - /opt/mssql-tools18/bin/sqlcmd
+                - -S
+                - localhost
+                - -U
+                - sa
+                - -P
+                - $(MSSQL_SA_PASSWORD)
+                - -Q
+                - SELECT 1
+                - -C
+            initialDelaySeconds: 120
+            periodSeconds: 60
+            timeoutSeconds: 15
+            failureThreshold: 5
           readinessProbe:
             tcpSocket:
               port: 1433
-            initialDelaySeconds: 30
-            periodSeconds: 5
+            initialDelaySeconds: 60
+            periodSeconds: 15
+            timeoutSeconds: 10
       volumes:
         - name: sqlserver-data
           persistentVolumeClaim: