Skip to content

REFACTORING.md

Latest commit

 

History

History
178 lines (142 loc) · 5.9 KB

REFACTORING.md

File metadata and controls

178 lines (142 loc) · 5.9 KB
Raw

Refactoring Summary - Phase 1-3

Completed Work

Phase 1: Security (Credentials Management)

Changes Made:

  1. Removed all hardcoded credentials

    • deploy_all.sh - Removed hardcoded admin:nimda321 credentials
    • grafana/add_datasources.sh - Removed hardcoded admin:nimda321 credentials
    • grafana/add_dashboards.sh - Removed hardcoded admin:nimda321 credentials
    • telegraf.conf - Removed hardcoded user/password for InfluxDB

  2. Environment Variable Management

    • Created .env.example with all configurable parameters
    • Updated all shell scripts to load from .env file
    • Added validation for required environment variables
    • Updated telegraf.conf to use ${VARIABLE} substitution

  3. Git Security

    • Created .gitignore to exclude .env files and sensitive data
    • Prevents accidental credential exposure in version control

Files Modified:

  • deploy_all.sh - Refactored entirely
  • undeploy_all.sh - Refactored with error handling
  • grafana/add_datasources.sh - Updated to use .env
  • grafana/add_dashboards.sh - Updated to use .env
  • telegraf.conf - Updated to use environment variables
  • .env.example - Created
  • .gitignore - Created
  • README.md - Updated

Phase 2: Modernization (Docker & Dependencies)

Changes Made:

  1. Docker Compose Version

    • Upgraded from v3 to v3.9
    • Better support for modern features

  2. Image Versions

    • Grafana: 5.1.3 → 10.2-alpine (latest stable, lighter weight)
    • InfluxDB: alpine → 2.7-alpine (modern 2.x with improved features)
    • Telegraf: latest → 1.28-alpine (fixed version, lighter weight)
    • Prometheus: v2.0.0 → v2.48.1 (major upgrade with better features)
    • Node Exporter: v0.13.0 → v1.7.0 (major upgrade)
    • cAdvisor: v0.28.3 → v0.47.0 (modern version)
    • AlertManager: prom/alertmanager → prom/alertmanager:v0.26.0 (pinned version)

  3. Volume Management

    • Properly defined named volumes with drivers
    • Added volume for InfluxDB data persistence
    • Added volume for Prometheus data persistence

  4. Network Configuration

    • Explicit network driver definitions
    • Proper public/private network setup

Files Modified:

  • docker-compose.yml - Completely refactored to v3.9

Phase 3: Robustness (Error Handling & Health Checks)

Changes Made:

  1. Health Checks

    • Added health checks for all services:
      • InfluxDB: curl to /ping endpoint
      • Grafana: curl to /api/health
      • Prometheus: curl to /-/healthy
      • AlertManager: curl to /-/healthy
      • Node Exporter: curl to port 9100
      • cAdvisor: curl to root endpoint

  2. Resource Limits & Reservations

    • InfluxDB: 2 CPU / 2GB limit, 0.5 CPU / 512MB reserved
    • Grafana: 1 CPU / 1GB limit, 0.25 CPU / 256MB reserved
    • Prometheus: 1 CPU / 1GB limit, 0.25 CPU / 256MB reserved
    • Telegraf: 0.5 CPU / 512MB limit, 0.25 CPU / 128MB reserved
    • cAdvisor: 0.5 CPU / 512MB limit, 0.25 CPU / 128MB reserved
    • AlertManager: 0.5 CPU / 256MB limit, 0.1 CPU / 64MB reserved
    • Node Exporter: 0.5 CPU / 256MB limit, 0.1 CPU / 64MB reserved

  3. Restart Policies

    • All services: unless-stopped policy
    • Automatic restart on failures

  4. Service Dependencies

    • Grafana waits for InfluxDB and Prometheus to be healthy
    • Prometheus depends on Node Exporter startup

  5. Script Error Handling

    • set -e in all shell scripts to fail fast
    • Environment variable validation
    • Required variable checks before execution
    • Proper error messages and exit codes
    • Health status checks in deploy script
    • Retry logic with countdown for service readiness

Files Modified:

  • deploy_all.sh - Added health checks, error handling, validation
  • undeploy_all.sh - Improved error handling and cleanup logic
  • grafana/add_datasources.sh - Added error checking and validation
  • grafana/add_dashboards.sh - Added required variable validation
  • docker-compose.yml - Added health checks, resource limits, restart policies

Phase 4: Documentation

Changes Made:

  1. README.md

    • Complete rewrite with proper structure
    • Quick start guide with prerequisites
    • Configuration table with all environment variables
    • Service access information
    • Maintenance and troubleshooting sections
    • Backup procedures

  2. ANALYSIS.md

    • Documented all identified issues
    • Security vulnerabilities
    • Outdated dependencies
    • Quality improvement areas

Security Improvements

  • ✅ No more hardcoded credentials in version control
  • ✅ Environment-based configuration for all secrets
  • ✅ .env excluded from git by default
  • ✅ Default credentials changed to "changeme" pattern
  • ✅ Validation of required credentials before deployment

Performance Improvements

  • ✅ Modern image versions with security patches
  • ✅ Alpine-based images (lighter weight)
  • ✅ Resource limits prevent runaway container growth
  • ✅ Health checks enable faster failure recovery
  • ✅ Prometheus v2.48.1 has significant performance improvements

Reliability Improvements

  • ✅ All services have health checks
  • ✅ Service dependencies enforce startup order
  • ✅ Restart policies ensure availability
  • ✅ Error handling in deployment scripts
  • ✅ Validation prevents misconfiguration

Next Steps (Not in Phase 1-3)

  1. Test deployment in staging environment
  2. Configure AlertManager notification channels
  3. Add custom dashboards for your metrics
  4. Set up log aggregation with Loki (if needed)
  5. Consider Kubernetes migration for scalability
  6. Add backup automation for InfluxDB and Prometheus

Migration Path

To apply these changes to an existing deployment:

  1. Backup current data:

    docker-compose down
cp -r data/ data.backup

  2. Apply new configuration:

    cp .env.example .env
# Edit .env with your settings
./deploy_all.sh

  3. Verify services:

    docker-compose ps
docker-compose logs grafana