fix: self-healing patch for CrashLoopBackOff in crash-test-55b8b665f4-hjqjs

[aftabkh4n]

Self-Healing Patch

This PR was opened automatically by the self-healing-k8s system.

Failure detected

• Pod: crash-test-55b8b665f4-hjqjs
• Namespace: default
• Type: CrashLoopBackOff
• Detected at: 2026-04-20 06:20:49 UTC

Root cause

The .NET application cannot establish a database connection to PostgreSQL at postgres://db:5432. The pod is entering CrashLoopBackOff because the application fails to start (FATAL: Cannot connect to postgres://db:5432) and exits, causing Kubernetes to continuously restart it. This indicates either the PostgreSQL service is unreachable, the hostname 'db' does not resolve, the database credentials are invalid, or PostgreSQL is not running.

Severity

Critical

Suggested fix

1. Verify the PostgreSQL service exists and is running in the cluster by executing 'kubectl get svc -A | grep postgres' and 'kubectl get pods -A | grep postgres'. 2. Confirm DNS resolution by executing 'kubectl exec -it crash-test-55b8b665f4-hjqjs -- nslookup db' to ensure 'db' resolves to the correct IP. 3. Check PostgreSQL service endpoint and port are correct - use 'kubectl describe svc ' to verify it's listening on port 5432. 4. Verify database credentials (username/password) in the application configuration match PostgreSQL. 5. Check PostgreSQL pod logs with 'kubectl logs ' to ensure the database is healthy. 6. If using a different namespace, update the connection string to use FQDN format: 'postgres://db.namespace.svc.cluster.local:5432'. 7. Implement startup probes or init containers to delay application start until PostgreSQL is ready.

Proposed code change

apiVersion: apps/v1
kind: Deployment
metadata:
name: crash-test
namespace: default
spec:
template:
spec:
initContainers:
- name: wait-for-db
image: busybox:1.35
command: ['sh', '-c', 'until nc -z db 5432; do echo waiting for db; sleep 2; done']
containers:
- name: crash-test
env:
- name: DATABASE_URL
value: "postgres://db:5432/mydb"
- name: DB_USER
valueFrom:
secretKeyRef:
name: db-credentials
key: username
- name: DB_PASSWORD
valueFrom:
secretKeyRef:
name: db-credentials
key: password
startupProbe:
exec:
command: ['/bin/sh', '-c', 'curl -f http://localhost:8080/health || exit 1']
initialDelaySeconds: 10
periodSeconds: 5
failureThreshold: 30

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