REPORT – Linux System Resources Monitoring (CPU & Memory) – v1.0.0

0.0 Executive Summary

This report documents the implementation and analysis of system resource monitoring in an Ubuntu Server environment. The objective was to monitor the CPU, memory, and swap usage using the Linux command-line tools. The project focused on using native utilities to collect real-time performance information and validate the availability of system resources.

Several monitoring tools were tested using different output and filtering options to improve troubleshooting visibility and establish a baseline for the normal system performance. The result was a validated monitoring workflow that supports system administration, troubleshooting, capacity planning, and security.

1.0 Monitoring System Resources

1.1 Project Description

The goal of this task was to develop practical skills for monitoring Linux system performance and identifying resource-related issues before they affect system stability.

The implementation used multiple Linux monitoring tools to:

Monitor CPU and memory usage in real time
Identify processes consuming excessive resources
Validate total available memory and swap space
Generate readable outputs for troubleshooting and reporting

The project also demonstrated how monitoring tools can assist administrators in performance incidents and security investigations.

1.2 Technical Task / Troubleshooting Process

The process focused on collecting and validating the system performance data using native Linux utilities.

Key Actions and Observations

Memory Utilization Monitoring
- Used free -h -t to display human-readable memory statistics, including RAM and swap totals.
- Used cat /proc/meminfo to review the raw kernel memory information for manual validation.
CPU and Process Monitoring
- Used top to identify processes that consume high CPU and memory resources.
- Used top -u to filter processes by specific users to isolate the impact.
Virtual Memory Monitoring
- Used vmstat -w to review the virtual memory statistics using a wide-format output.
- Verified that the wide mode prevented column formatting issues on larger terminal displays.

Troubleshooting Highlights

Manual Calculation Complexity
- Raw values from /proc/meminfo were difficult to interpret quickly because memory values were displayed in kilobytes.
- This issue was resolved using free -h -t, which automatically converts values into human-readable units.
Display Formatting Issues
- The standard vmstat output produces compressed columns on wider systems.
- This issue was corrected using the -w flag to improve the readability.

1.3 Resolution and Validation

The monitoring configuration was validated by checking the command accuracy and confirming successful output generation.

Parameter	Configuration Value
Primary Monitoring Tools	top / free
Output Format	Human-Readable (-h)
Monitoring Scope	Real-Time System Performance

Validation Steps

Memory Validation
- Verified that free -h -t correctly displays RAM and swap totals.
- Compared results against values from /proc/meminfo to ensure output accuracy.
Tool Functionality Validation
- Confirmed that all requested flags (-h, -t, -u, -w) were functional and produced the expected filtered or formatted outputs.

2.0 CONCLUSION

2.1 Key Takeaways

Human-readable flags, such as -h improve the speed and accuracy of system analysis.
Validation is not just about seeing if a command works; it is about ensuring that the output is accurate.
Using free -h -t combines formatting and calculation, making it a “stress test” for the basic functionality of the utility.
The vmstat -w command prevents column misalignment on high-resolution display.
Native Linux monitoring utilities provide sufficient visibility for most baseline-troubleshooting tasks.

2.2 Security Implications and Recommendations

Risk: Resource Exhaustion (Denial of Service)

Unmonitored processes can consume excessive CPU or memory resources, causing system instability and service interruption.

Mitigation

Monitored swap usage and sustained high CPU utilization.
Establish baseline performance thresholds.

Risk: Compromised User Activity

Compromised accounts may execute unauthorized background processes, such as cryptominers or resource abuse scripts.