homelab-optimized/docs/services/individual/prometheus.md

Prometheus

🟡 Monitoring Service

📋 Service Overview

Property	Value
Service Name	prometheus
Host	homelab-vm (192.168.0.210)
Port	9090
URL	http://192.168.0.210:9090
Docker Image	prom/prometheus
Compose File	hosts/vms/homelab-vm/monitoring.yaml
Targets	14 active (all hosts via node_exporter + SNMP)

🎯 Purpose

Prometheus is an open-source systems monitoring and alerting toolkit.

🚀 Quick Start

Prerequisites

• Docker and Docker Compose installed
• Basic understanding of REDACTED_APP_PASSWORD
• Access to the host system (setillo)

Deployment

# Navigate to service directory
cd setillo/prometheus

# Start the service
docker-compose up -d

# Check service status
docker-compose ps

# View logs
docker-compose logs -f prometheus

🔧 Configuration

Docker Compose Configuration

command:
- --storage.tsdb.retention.time=60d
- --config.file=/etc/prometheus/prometheus.yml
container_name: Prometheus
cpu_shares: 768
healthcheck:
  test: wget --no-verbose --tries=1 --spider http://localhost:9090/ || exit 1
hostname: prometheus-docker
image: prom/prometheus
mem_limit: 1g
networks:
- prometheus-net
ports:
- 12090:9090
restart: on-failure:5
security_opt:
- no-new-privileges=true
user: 1027:100
volumes:
- /volume1/docker/prometheus/prometheus:/prometheus:rw
- /volume1/docker/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml:ro

Environment Variables

No environment variables configured.

Port Mappings

Host Port	Container Port	Protocol	Purpose
12090	9090	TCP	Prometheus metrics

Volume Mappings

Host Path	Container Path	Type	Purpose
/volume1/docker/prometheus/prometheus	/prometheus	bind	Data storage
/volume1/docker/prometheus/prometheus.yml	/etc/prometheus/prometheus.yml	bind	Configuration files

🌐 Access Information

Service ports: 12090:9090

🔒 Security Considerations

• ✅ Security options configured
• ✅ Non-root user configured

📊 Resource Requirements

No resource limits configured

Recommended Resources

• Minimum RAM: 512MB
• Recommended RAM: 1GB+
• CPU: 1 core minimum
• Storage: Varies by usage

Resource Monitoring

Monitor resource usage with:

docker stats

🔍 Health Monitoring

✅ Health check configured Test Command: wget --no-verbose --tries=1 --spider http://localhost:9090/ || exit 1

Manual Health Checks

# Check container health
docker inspect --format='{{.State.Health.Status}}' CONTAINER_NAME

# View health check logs
docker inspect --format='{{range .State.Health.Log}}{{.Output}}{{end}}' CONTAINER_NAME

🚨 Troubleshooting

Common Issues

Service won't start

• Check Docker logs: docker-compose logs service-name
• Verify port availability: netstat -tulpn | grep PORT
• Check file permissions on mounted volumes

Can't access web interface

• Verify service is running: docker-compose ps
• Check firewall settings
• Confirm correct port mapping

Performance issues

• Monitor resource usage: docker stats
• Check available disk space: df -h
• Review service logs for errors

Metrics not collecting

• Check target endpoints are accessible
• Verify configuration syntax
• Check network connectivity

Useful Commands

# Check service status
docker-compose ps

# View real-time logs
docker-compose logs -f prometheus

# Restart service
docker-compose restart prometheus

# Update service
docker-compose pull prometheus
docker-compose up -d prometheus

# Access service shell
docker-compose exec prometheus /bin/bash
# or
docker-compose exec prometheus /bin/sh

📚 Additional Resources

• Official Documentation: Check the official docs for prometheus
• Docker Hub: prom/prometheus
• Community Forums: Search for community discussions and solutions
• GitHub Issues: Check the project's GitHub for known issues

🔗 Related Services

Services REDACTED_APP_PASSWORD prometheus:

• Grafana
• Prometheus
• Uptime Kuma
• Node Exporter

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This documentation is auto-generated from the Docker Compose configuration. For the most up-to-date information, refer to the official documentation and the actual compose file.

Last Updated: 2025-11-17
Configuration Source: setillo/prometheus/compose.yaml