A comprehensive Python CLI tool for validating system migrations through data collection, snapshot comparison, and automated reporting. Designed for enterprise migration workflows where system consistency and data integrity are critical.

Overview

The Migration Validation Framework provides a systematic approach to validating system migrations by:

Collecting comprehensive system data before and after migration
Generating structured JSON snapshots for comparison
Performing intelligent diff analysis between snapshots
Generating detailed HTML reports with change visualization
Providing CLI interface for integration into migration pipelines

Architecture

┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   CLI Interface │    │   Data          │    │   Validation    │
│   (cli.py)      │◄──►│   Collectors    │◄──►│   Engine         │
│                 │    │                 │    │                 │
│ - Command       │    │ - mounts.py     │    │ - compare.py    │
│   parsing       │    │ - services.py   │    │ - diff.py       │
│ - Workflow      │    │ - disk_usage.py │    │ - validate.py   │
│   orchestration │    │ - network.py    │    │                 │
└─────────────────┘    └─────────────────┘    └─────────────────┘
         │                       │                       │
         ▼                       ▼                       ▼
┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   JSON          │    │   Comparison    │    │   HTML          │
│   Snapshots     │    │   Results       │    │   Reports       │
│                 │    │                 │    │                 │
│ - Pre-migration │    │ - Differences   │    │ - Summary       │
│ - Post-migration│    │ - Risk levels   │    │ - Details       │
│ - Metadata      │    │ - Validation    │    │ - Charts        │
└─────────────────┘    └─────────────────┘    └─────────────────┘

Quick Start

Prerequisites

Python 3.8+
SSH access to target systems
Appropriate permissions for data collection

Installation

cd migration-validation-framework
pip install -r requirements.txt

Basic Usage

# Create pre-migration snapshot
python cli.py snapshot --env production --label pre-migration --systems web01,db01

# Perform migration...

# Create post-migration snapshot
python cli.py snapshot --env production --label post-migration --systems web01,db01

# Compare snapshots
python cli.py compare pre-migration post-migration --output comparison_001

# Generate HTML report
python cli.py report --comparison comparison_001 --format html --output migration_report.html

Project Structure

migration-validation-framework/
├── cli.py                 # Main CLI interface
├── collectors/           # Data collection modules
│   ├── mounts.py        # Filesystem mount collection
│   ├── services.py      # System services collection
│   ├── disk_usage.py    # Disk usage statistics
│   ├── network.py       # Network configuration
│   └── processes.py     # Running processes
├── validators/          # Validation and comparison logic
│   ├── compare.py       # Snapshot comparison engine
│   ├── diff.py          # Difference calculation
│   └── validate.py      # Validation rules
├── reports/             # Report generation
│   ├── html_report.py   # HTML report generator
│   ├── json_report.py   # JSON report generator
│   └── summary.py       # Summary calculations
├── config/              # Configuration files
│   ├── collectors.yaml  # Collector configurations
│   └── validators.yaml  # Validation rules
├── tests/               # Unit and integration tests
├── logs/                # Application logs
└── snapshots/           # Stored snapshots

Data Collectors

Mounts Collector (`collectors/mounts.py`)

Collects filesystem mount information including:

Mount points and devices
Filesystem types
Mount options
Capacity and usage statistics

Services Collector (`collectors/services.py`)

Gathers system service status:

Running services
Service states (active, inactive, failed)
Startup configuration
Dependencies

Disk Usage Collector (`collectors/disk_usage.py`)

Analyzes disk space utilization:

Directory size statistics
File system usage
Inode usage
Largest files and directories

Network Collector (`collectors/network.py`)

Captures network configuration:

Interface configurations
Routing tables
DNS settings
Firewall rules

Processes Collector (`collectors/processes.py`)

Documents running processes:

Process lists with PIDs
Memory and CPU usage
Process owners
Command lines

Validation Engine

Comparison Logic (`validators/compare.py`)

Performs intelligent comparison of snapshots:

Structural differences detection
Semantic change analysis
Risk level assessment
Change categorization

Difference Calculator (`validators/diff.py`)

Calculates detailed differences:

Added/removed/modified items
Quantitative changes
Configuration drift detection
Anomaly identification

Validation Rules (`validators/validate.py`)

Applies validation rules:

Critical change detection
Compliance checking
Threshold validation
Custom rule engine

Reporting

HTML Reports (`reports/html_report.py`)

Generates comprehensive HTML reports featuring:

Executive summary dashboard
Detailed change logs
Risk assessment visualizations
Interactive charts and graphs
Export capabilities

JSON Reports (`reports/json_report.py`)

Provides structured JSON output for:

API integration
Automated processing
Audit trails
Compliance reporting

CLI Interface

Commands

# Snapshot management
python cli.py snapshot --env <env> --label <label> [--systems <hosts>]
python cli.py list-snapshots [--env <env>]
python cli.py delete-snapshot <snapshot-id>

# Comparison operations
python cli.py compare <snapshot1> <snapshot2> [--output <comparison-id>]
python cli.py list-comparisons
python cli.py show-comparison <comparison-id>

# Reporting
python cli.py report --comparison <comparison-id> --format <format> [--output <file>]
python cli.py export --comparison <comparison-id> --format <format>

# Configuration
python cli.py config --show
python cli.py config --set <key> <value>

Options

--env: Target environment (production, staging, development)
--systems: Comma-separated list of target systems
--parallel: Number of parallel collection threads
--timeout: Collection timeout in seconds
--verbose: Enable verbose output
--dry-run: Preview actions without execution

Configuration

Collector Configuration (`config/collectors.yaml`)

collectors:
  mounts:
    enabled: true
    timeout: 30
    exclude_patterns:
      - "/proc/*"
      - "/sys/*"

  services:
    enabled: true
    include_disabled: false
    service_manager: systemd

  disk_usage:
    enabled: true
    max_depth: 3
    exclude_paths:
      - "/tmp"
      - "/var/log"

Validation Rules (`config/validators.yaml`)

rules:
  critical_services:
    - sshd
    - systemd
    - network

  filesystem_thresholds:
    warning: 80
    critical: 95

  network_changes:
    allow_new_interfaces: false
    allow_route_changes: false

Examples

Complete Migration Validation Workflow

# 1. Pre-migration snapshot
python cli.py snapshot --env production --label "migration-pre-20241201" \
    --systems web01,web02,db01,lb01 --parallel 4

# 2. Execute migration process
# ... migration steps ...

# 3. Post-migration snapshot
python cli.py snapshot --env production --label "migration-post-20241201" \
    --systems web01,web02,db01,lb01 --parallel 4

# 4. Compare snapshots
python cli.py compare migration-pre-20241201 migration-post-20241201 \
    --output migration-dec2024

# 5. Generate reports
python cli.py report --comparison migration-dec2024 --format html \
    --output migration_validation_report.html

python cli.py report --comparison migration-dec2024 --format json \
    --output migration_validation_data.json

Automated Validation in CI/CD

#!/bin/bash
# CI/CD validation script

ENVIRONMENT=$1
SNAPSHOT_LABEL="ci-${BUILD_NUMBER}"

# Create snapshot
python cli.py snapshot --env $ENVIRONMENT --label $SNAPSHOT_LABEL

# Compare with baseline
python cli.py compare baseline-$ENVIRONMENT $SNAPSHOT_LABEL --output ci-$BUILD_NUMBER

# Generate report
python cli.py report --comparison ci-$BUILD_NUMBER --format html

# Check for critical changes
if python cli.py check-critical --comparison ci-$BUILD_NUMBER; then
    echo "Migration validation passed"
    exit 0
else
    echo "Critical changes detected - review required"
    exit 1
fi

Security Considerations

SSH key-based authentication only
Encrypted snapshot storage
Access control for sensitive data
Audit logging of all operations
Data sanitization and filtering

Performance Optimization

Parallel data collection
Incremental snapshots
Compressed storage
Memory-efficient processing
Timeout handling

Monitoring and Logging

Comprehensive logging to logs/validation.log
Performance metrics collection
Error tracking and alerting
Audit trail generation

Troubleshooting

Common Issues

Connection Failures:

# Check SSH connectivity
ssh -i ~/.ssh/id_rsa user@target-host

# Verify Python availability
python cli.py --test-connection --systems target-host

Collection Timeouts:

# Increase timeout
python cli.py snapshot --timeout 300 --systems slow-host

# Check system load
ssh user@target-host uptime

Permission Errors:

# Verify sudo access
ssh user@target-host sudo -l

# Check file permissions
ssh user@target-host ls -la /etc/

Development

Adding New Collectors

Create collector module in collectors/
Implement collection logic
Add configuration schema
Update CLI interface
Add unit tests

Custom Validation Rules

Define rules in config/validators.yaml
Implement validation logic in validators/
Update report generation
Test with sample data

Contributing

Follow existing code structure and naming conventions
Add comprehensive tests for new functionality
Update documentation for API changes
Ensure backward compatibility

License

Enterprise Internal Use Only

README.md

Migration Validation Framework