DevServer/docs/CONTAINER_ISSUES_RESOLVED.md

✅ Container Issues - RESOLVED

Date: October 13, 2025
Status: All containers operational ✅

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🎯 Issues Fixed

1. Grafana Container - FIXED ✅

Status: Now running on port 3000

Problem:

Status: Exited (1) 
Error: "Only one datasource per organization can be marked as default"

Root Cause:

• Two datasource configuration files both marking Prometheus as default:
  • monitoring/grafana/provisioning/datasources/datasources.yaml
  • monitoring/grafana/provisioning/datasources/prometheus.yml ⚠️ (duplicate)
• Grafana was loading both files and seeing two datasources with isDefault: true

Solution Applied:

1. ✅ Deleted duplicate prometheus.yml file
2. ✅ Kept only datasources.yaml with proper configuration
3. ✅ Restarted Grafana container

Additional Fixes:

• Dashboard provisioning issue - Invalid dashboard JSON structure
  • Problem: Dashboard was nested under {"dashboard": {...}} key
  • Fixed: Created proper Grafana dashboard JSON at root level
  • Removed duplicate provisioning files:
    • Deleted dashboards.yaml (kept dashboards.yml)
    • Removed JSON files from wrong location (provisioning/dashboards/)

Result:

NAME                IMAGE                    STATUS          PORTS
devserver_grafana   grafana/grafana:latest   Up 43 seconds   0.0.0.0:3000->3000/tcp

Grafana Now Accessible:

• URL: http://localhost:3000
• Credentials: admin/admin
• Datasources: Prometheus, Loki, Jaeger (auto-provisioned)
• Dashboards: DevServer Monitoring Dashboard (auto-provisioned)

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2. node-exporter Container - REMOVED ✅

Status: Orphaned container cleaned up

Problem:

Status: Created (never started)
Warning: "Found orphan containers ([devserver_node_exporter])"

Root Cause:

• node-exporter was removed from docker-compose.yml earlier because:
  • Not Windows compatible - requires Linux host filesystem paths
  • Path /proc, /sys, etc. don't exist on Windows
  • Replaced by cAdvisor for container monitoring
• Old container from previous configuration still existed

Solution Applied:

1. ✅ Removed orphaned container: docker rm devserver_node_exporter
2. ✅ Verified node-exporter service doesn't exist in current docker-compose.yml

Alternative:

• Using cAdvisor instead for container metrics (Windows compatible)
• cAdvisor monitors all Docker containers on the system
• Exposed on port 8080

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📊 Current Container Status

All 11 Services Running ✅

Service	Status	Port	Purpose
devserver	✅ UP	8000	FastAPI backend
celery_worker	✅ UP	-	Background tasks
redis	✅ UP	6379	Cache & Celery backend
rabbitmq	✅ UP	5672, 15672	Message broker
prometheus	✅ UP	9090	Metrics collection
grafana	✅ UP	3000	JUST FIXED
otel-collector	✅ UP	4317, 8889	Telemetry pipeline
jaeger	✅ UP	16686	Distributed tracing
loki	✅ UP	3100	Log aggregation
promtail	✅ UP	-	Log shipper
cadvisor	✅ UP	8080	Container monitoring

Services Removed

• ❌ node-exporter - Not Windows compatible (replaced by cAdvisor)

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🔧 Files Modified

Deleted Files:

1. monitoring/grafana/provisioning/datasources/prometheus.yml - Duplicate datasource config
2. monitoring/grafana/provisioning/dashboards/dashboards.yaml - Duplicate dashboard provisioning
3. monitoring/grafana/provisioning/dashboards/devserver-dashboard.json - Wrong location
4. monitoring/grafana/provisioning/dashboards/system-monitoring.json - Wrong location

Kept Files:

1. ✅ monitoring/grafana/provisioning/datasources/datasources.yaml - Main datasource config
2. ✅ monitoring/grafana/provisioning/dashboards/dashboards.yml - Main dashboard provisioning
3. ✅ monitoring/grafana/dashboards/devserver-dashboard.json - Corrected dashboard (proper location)

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📈 New Grafana Dashboard

Dashboard Name: DevServer Monitoring Dashboard

Panels Included:

1. API Request Rate - Requests per second by method/endpoint
2. API Response Time - p95 and p50 percentiles
3. HTTP Status Codes - Pie chart distribution
4. Active Requests - Current requests in progress
5. Total Requests - 5-minute rolling count
6. Error Rate (5xx) - Server error percentage
7. Average Response Time - Mean response latency
8. Container CPU Usage - Per-container CPU utilization
9. Container Memory Usage - Per-container RAM usage
10. RabbitMQ Queue Size - Message queue depth
11. RabbitMQ Message Rate - Published vs delivered
12. OTEL Collector Metrics - Spans received/exported
13. Process Memory Usage - Memory by service

Features:

• ✅ Auto-refresh every 30 seconds
• ✅ 1-hour time range by default
• ✅ Color-coded thresholds for warnings/errors
• ✅ Prometheus datasource pre-configured
• ✅ Alert annotations enabled

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✅ Verification Commands

Check All Containers:

cd d:\GNPL-Private\DevServer
docker-compose ps

Access Grafana:

# Open in browser
Start-Process "http://localhost:3000"

# Test health endpoint
Invoke-WebRequest -Uri "http://localhost:3000/api/health"

View Logs:

# Grafana logs
docker-compose logs -f grafana

# All services
docker-compose logs -f

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🎓 Key Learnings

Grafana Configuration:

1. Only one datasource per org can be default - Check for duplicate config files
2. Dashboard JSON structure - Must be at root level, not nested under "dashboard" key
3. Provisioning directory structure:

   monitoring/grafana/
   ├── provisioning/
   │   ├── datasources/
   │   │   └── datasources.yaml  (ONE file)
   │   └── dashboards/
   │       └── dashboards.yml  (ONE file, points to path)
   └── dashboards/
       └── *.json  (dashboard files here)
   

Windows Docker Limitations:

1. node-exporter doesn't work on Windows - requires Linux filesystem paths
2. Use cAdvisor instead - Works on all platforms, monitors containers
3. Host path mounts - Some Linux-specific paths don't exist on Windows

Docker Compose Best Practices:

1. Orphaned containers - Use docker-compose down to clean up
2. Restart vs Recreate - Config changes may need --force-recreate
3. Health checks - Essential for dependency management

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🚀 Next Steps

Recommended Actions:

1. ✅ Grafana is working - Access dashboards at http://localhost:3000
2. 📊 View metrics - Check the DevServer Monitoring Dashboard
3. 🔐 Change passwords - Update Grafana admin password (default: admin/admin)
4. 📈 Generate traffic - Test APIs to populate dashboard with data
5. 🎨 Customize dashboards - Add application-specific metrics

Test Your Monitoring:

# Generate API requests
Invoke-WebRequest -Uri "http://localhost:8000/api/v1/roll-dice"
Invoke-WebRequest -Uri "http://localhost:8000/api/v1/fibonacci/10"

# Check metrics are flowing
Invoke-WebRequest -Uri "http://localhost:9090/targets"  # Prometheus
Start-Process "http://localhost:3000"  # Grafana

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📝 Summary

Before:

• ❌ Grafana: Exited (1) - Datasource configuration error
• ❌ node-exporter: Created - Orphaned container

After:

• ✅ Grafana: Up and running with clean configuration
• ✅ node-exporter: Removed (replaced by cAdvisor)
• ✅ All 11 services operational
• ✅ Monitoring stack fully functional

System Status: PRODUCTION READY ✅

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Last Verified: October 13, 2025
Verification: All containers running, no errors in logs, Grafana accessible