in-cluster-checks 0.1.4

Generic framework for running health validation rules on OpenShift cluster nodes

In-Cluster Checks

A generic framework for running health validation rules directly on OpenShift cluster nodes using oc debug.

Overview

This framework provides infrastructure for:

• Running validation rules on cluster nodes via oc debug
• Parallel execution of rules across multiple nodes
• Secret filtering and output formatting
• Prerequisite checking and domain orchestration
• Insights-compatible JSON output

Originally developed as part of Red Hat's Pendrive project, this framework has been extracted as open-source to benefit the broader OpenShift community.

Features

• Generic validation framework: Base classes for creating custom health check rules
• OpenShift integration: Direct node access via oc debug with persistent connections
• Domain organization: Group related rules into domains (hardware, network, linux, storage)
• Parallel execution: Run rules concurrently across multiple nodes
• Secret filtering: Automatic redaction of sensitive data from outputs
• Extensible: Easy to add new rules and domains

Installation

pip install in-cluster-checks

Quick Start

First, ensure you're logged into your OpenShift cluster:

oc login https://api.your-cluster.com:6443

Then run the checks:

# Run all checks (output saved to ./cluster-checks.json)
in-cluster-checks --output ./cluster-checks.json

# Run with debug logging
in-cluster-checks --log-level DEBUG

# Debug a specific rule (disables secret filtering)
in-cluster-checks --debug-rule "check_disk_usage"

# List available domains
in-cluster-checks --list-domains

# List all available rules
in-cluster-checks --list-rules

Programmatic Usage

You can also use the framework programmatically in your Python code:

from in_cluster_checks.runner import InClusterCheckRunner
from pathlib import Path

# Create runner with default configuration
runner = InClusterCheckRunner()

# Or customize configuration
runner = InClusterCheckRunner(
    max_workers=75,           # Maximum concurrent workers (default: 50)
    debug_rule_flag=False,    # Enable debug mode (default: False)
    debug_rule_name="",       # Specific rule to debug (default: "")
)

# Run checks and save results
output_path = Path("./results/cluster-checks.json")
runner.run(output_path=output_path)

Configuration Options

• max_workers (int, default: 50): Maximum number of concurrent workers for parallel execution
• debug_rule_flag (bool, default: False): Enable debug mode with verbose output
• debug_rule_name (str, default: ""): Name of specific rule to run in debug mode

Note: When debug mode is enabled:

• Only the specified rule runs
• Secret filtering is automatically disabled
• JSON output is disabled (real-time console output only)
• Detailed command execution logs are printed

Architecture

Core Components

• Rule: Base class for validation rules
• RuleDomain: Orchestrator for groups of related rules
• Operator: Command execution abstraction
• NodeExecutor: Execute commands on cluster nodes via oc debug
• LoggerInterface: Pluggable logging abstraction

Built-in Domains

• Hardware: Disk usage, memory, CPU, temperature validation
• Network: OVS, DNS, bonding checks
• Linux: Systemd, SELinux, clock synchronization
• Storage: Storage validation rules
• Hardware/Firmware Details: Informational collectors for hardware inventory

Creating Custom Rules

from in_cluster_checks.core.rule import Rule
from in_cluster_checks.core.rule_result import RuleResult
from in_cluster_checks.utils.enums import Status, Objectives

class MyCustomRule(Rule):
    """Example custom validation rule."""

    objective_hosts = [Objectives.ALL_NODES]

    def set_document(self):
        self.unique_name = "my_custom_rule"
        self.title = "My Custom Validation Rule"

    def run_rule(self):
        # Run validation logic
        return_code, stdout, stderr = self.run_cmd("my-command")

        if return_code == 0:
            return RuleResult.passed("Validation passed")
        else:
            return RuleResult.failed(f"Validation failed: {stderr}")

Requirements

• Python 3.9+
• OpenShift CLI (oc) installed and configured
• Access to OpenShift cluster

Development

# Clone repository
git clone https://github.com/sprizend-rh/in-cluster-checks.git
cd in-cluster-checks

# Install development dependencies
pip install -e ".[dev]"

# Run tests
pytest

# Run pre-commit checks
pre-commit run --all-files

License

GNU General Public License v3.0 or later

See LICENSE for full text.

Contributing

Contributions are welcome! Please feel free to submit pull requests or open issues.

Related Projects

• Pendrive: Red Hat's on-premise Insights validation tool (internal)
• OpenShift: Container orchestration platform

Acknowledgments

This framework was extracted from Red Hat's Pendrive project. The core validation infrastructure is generic and contains no confidential logic, making it suitable for open-source release to benefit the wider OpenShift community.