Qubership Logging Operator

Kubernetes Operator for deploying and managing a comprehensive logging stack including Graylog, FluentD, FluentBit, and K8S Events Reader.

Table of Contents

1. Features
2. Requirements
3. Installation
4. Usage
5. Configuration
6. API Reference
7. Architecture
8. Testing
9. Contributing
10. License

Features

The main features are as follows:

• Comprehensive Logging Stack: Deploy Graylog, FluentD, FluentBit, and K8S Events Reader
• Kubernetes Native: Extend Kubernetes API with custom resources and controllers
• Multi-Platform Support: Kubernetes 1.21+ and OpenShift 4.10+ compatibility
• Template-Based Deployment: Logging deployment via customizable templates
• High Availability: Support for HA configurations
• Cloud Integration: AWS CloudWatch, Kafka, Splunk integrations
• Security: TLS support, RBAC, authentication proxy
• Monitoring: Built-in observability and troubleshooting tools
• Integration Testing: Automated testing framework

Requirements

Common Prerequisites

• Kubernetes: 1.21+ or OpenShift 4.10+
• Command-line Tools: kubectl 1.21+ or oc 4.10+
• Package Manager: Helm 3.0+
• Go: 1.24+ (for development)

Storage Requirements

• Persistent Volumes: Required for Graylog (MongoDB and journald)
• Storage Types: Block storage recommended (NFS-like storage not supported)
• OpenSearch/ElasticSearch: Compatible versions depend on Graylog version

For detailed storage requirements, see the Installation Guide.

Installation

Quick Start with Helm

1. Add the Helm repository:

   helm repo add qubership-logging-operator https://netcracker.github.io/qubership-logging-operator
   helm repo update

2. Install the operator:

   helm install qubership-logging-operator qubership-logging-operator/qubership-logging-operator

3. Create a LoggingService custom resource to deploy your logging stack.

For comprehensive installation instructions, see the Installation Guide.

Usage

The operator extends Kubernetes API by creating custom resources and controllers that watch these resources. Deploy logging components by creating LoggingService custom resources.

Example usage and configuration can be found in the Examples section.

Configuration

The operator supports extensive configuration options for all logging components:

• FluentD: Custom inputs, filters, and outputs
• FluentBit: Daemon set and stateful set configurations
• Graylog: Authentication, plugins, storage settings
• K8S Events Reader: Event filtering and forwarding

For detailed configuration options, see:

• Configuration Guide
• Configuration Examples

API Reference

Complete API documentation is available at:

• API Reference
• Architecture & Components

Architecture

System Overview

flowchart TB
    subgraph "Kubernetes Cluster"
        subgraph "Logging Operator"
            LO[Logging Operator<br/>Controller]
            CR[LoggingService<br/>Custom Resource]
        end
        
        subgraph "Log Collection"
            FB[FluentBit<br/>DaemonSet]
            FD[FluentD<br/>DaemonSet]
            ER[Events Reader<br/>Deployment]
        end
        
        subgraph "Log Processing & Storage"
            GL[Graylog<br/>StatefulSet]
            MG[(MongoDB)]
            ES[(OpenSearch/<br/>ElasticSearch)]
        end
        
        subgraph "Applications"
            APP1[App Pods]
            APP2[App Pods]
            K8S[Kubernetes API]
        end
    end
    
    subgraph "External"
        EXT[External Systems<br/>AWS CloudWatch, Kafka, Splunk]
    end
    
    CR --> LO
    LO --> FB
    LO --> FD
    LO --> GL
    LO --> ER
    
    APP1 --> FB
    APP2 --> FB
    K8S --> ER
    
    FB --> FD
    FD --> GL
    ER --> GL
    
    GL --> MG
    GL --> ES
    GL --> EXT

Loading

The operator follows the standard Kubernetes operator pattern, extending the API with custom resources and controllers. For detailed architecture information, see the Architecture Guide.

Testing

The project includes comprehensive testing:

Integration Tests

# Run integration tests
make test-integration

Robot Framework Tests

# Run robot tests
cd test/robot-tests
pip install -r requirements.txt
robot src/tests/

For more testing information, see the test directories:

• test/envtests/ - Environment tests
• test/robot-tests/ - Robot framework tests

Contributing

We'd love to accept patches and contributions to this project. Please follow these guidelines:

1. Contributor License Agreement: You must sign the Contributor License Agreement
2. Code of Conduct: Read and follow the Code of Conduct
3. Development: See CONTRIBUTING.md for detailed contribution guidelines

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.