# Logging and Audit Logging
**Logging and audit logging** are critical components of security, compliance, and operational monitoring in ONEWEB.\
They provide visibility into system behavior, user activities, and potential security incidents, enabling organizations to detect issues, investigate events, and meet audit requirements.
ONEWEB implements **multi‑level logging** and supports **centralized log aggregation** for scalable and secure monitoring.
***
### Purpose of Logging & Audit Logging
Logging in ONEWEB is designed to:
* Record system and application events
* Track user actions and access activities
* Support incident investigation and forensics
* Enable compliance auditing and traceability
* Monitor system health and performance
Audit logging, in particular, ensures **accountability** by answering:
> *Who did what, when, and from where?*
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### Logging Architecture in ONEWEB
#### Multi‑Level Logging
ONEWEB logging spans multiple levels across the platform, including:
* Application‑level logs
* Service and microservice logs
* Security and access‑related logs
In a **microservice‑based architecture**, ONEWEB uses the **ELK Stack (Elasticsearch, Logstash, Kibana)** for centralized logging and analysis.
***
### Logging Framework: Log4j
ONEWEB 4.0 uses **Log4j** as its primary logging framework.
Key characteristics:
* Log formatting patterns are defined in a **property file**
* Logging levels (INFO, WARN, ERROR, DEBUG, etc.) can be configured centrally
* Output file paths are configured via ONEWEB constants
#### Example: `log4j.properties`
*Figure: Example Log4j configuration file*
This configuration allows administrators to fine‑tune logging behavior without changing application code.
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### Centralized Log Processing
ONEWEB uses centralized logging to ensure consistency and scalability.
The process includes:
* Filtering log entries to capture only relevant data
* Sending selected log data to a **central repository**
* Retaining logs according to operational or compliance needs
This approach avoids excessive log storage while preserving security‑critical information.
***
### Log Visualization & Analysis with ELK
Once logs are collected centrally, they can be visualized and analyzed using **Kibana**, part of the ELK Stack.
Capabilities include:
* Real‑time log searching and filtering
* Visualization of trends and anomalies
* Correlation of events across services
* Faster incident detection and root‑cause analysis
*Figure: Log monitoring and analysis using ELK*
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### Audit Logging & Compliance
Audit logs are essential for:
* Security investigations
* Regulatory compliance
* Internal and external audits
Audit logging typically includes:
* Authentication and authorization events
* Role and permission changes
* Access to sensitive resources
* Administrative actions
These logs support **non‑repudiation**, ensuring that users cannot deny actions they performed.
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### Best Practices for Logging & Audit Logging
* Enable detailed logging for authentication and access control events
* Protect log files from unauthorized access or tampering
* Define log retention policies aligned with compliance requirements
* Avoid logging sensitive data such as passwords or tokens
* Monitor logs continuously for suspicious behavior
***
### Summary
Logging and audit logging in ONEWEB provide the foundation for **security monitoring, compliance, and operational visibility**.
Key points:
* ONEWEB uses **Log4j** for configurable application logging
* Logs are centralized using the **ELK Stack**
* Audit logging ensures accountability and traceability
* Centralized visualization enables proactive security analysis
Together, logging and audit logging enable ONEWEB deployments to remain **secure, observable, and compliance‑ready** in enterprise environments.
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