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0. OpenTCS Local Debugging and Development Environment Setup

This article briefly introduces local development debugging for OpenTCS.

Environment Preparation

  • We're using OpenTCS 5.x, due to legacy project constraints, higher versions are not considered for now.
  • OpenJDK must be 13.x, please pay special attention
  • If you want to develop GUI interfaces, you must use Netbeans IDE for development, because OpenTCS uses visual components where many are Netbeans-specific Swing components that cannot be opened in other IDEs like IntelliJ IDEA.
ctbotsSeptember 15, 2025About 2 minJavaOpenTCSOpenTCS
OpenTCS Core Architecture and Basic Concepts Explained

This article introduces the core architecture and basic concepts of OpenTCS.

Core Architecture Overview

OpenTCS adopts modular design, mainly including the following core components:

OpenTCS Basic Architecture Description
OpenTCS Basic Architecture Description
ctbotsSeptember 15, 2025About 3 minJavaAGV SystemOpenTCSArchitecture Design
File-Network Resource Leak - Simple Troubleshooting Methods

In daily system operations and troubleshooting, resource leaks are a common yet frustrating problem. Issues like file handle leaks, TCP connection leaks, and UDP socket leaks, if not detected and handled promptly, often lead to system performance degradation or even service unavailability.

Traditional troubleshooting methods require executing various commands on servers and manually analyzing output results, which is not only inefficient but also prone to missing critical information. To solve this pain point, I developed a set of online visualization tools that make resource leak problem identification simple and efficient.

CtBotsSeptember 15, 2025About 2 minLinuxPerformance AnalysisResource LeakOnline Tools
PVE Installation White Screen Problem Solution Guide

Some special hardware may experience white screen issues when installing PVE, preventing visual GUI installation. The solution is as follows:

During Installation, Enter Debug Mode While Display is Still Working

Enter PVE debug installation mode
Enter PVE debug installation mode
ctbotsSeptember 15, 2025About 1 minOperation GuideVirtualizationPVETroubleshooting
Analyzing Linux Process pmap Memory Layout Information

Tools like top and htop can only tell you how much memory a process is using, but they can't show you how that memory is actually distributed. I developed an online visualization tool to make memory analysis much easier.

What are pmap and smaps?

pmap: The Concise Version of Process Memory Map

CtBotsSeptember 14, 2025About 3 minLinuxPerformance AnalysispmapMemory Analysis
SAR Data Online Charting Practical Guide

If performance issues have occurred historically but no monitoring system has collected data, then sar might be your only option left. SAR is like the system's "health report" that can tell you what exactly happened to CPU, memory, disk, and network over a period of time.

What exactly is sar?

CtBotsSeptember 13, 2025About 2 minLinuxMonitoring SystemssarPerformance Monitoring
Practical Guide to Analyzing Linux System Calls with strace

When it comes to Linux system debugging, strace is absolutely a powerful tool. When troubleshooting problems, I often encounter situations where programs mysteriously slow down, or some service suddenly stops working, but you can't see any clues from the logs. This is when strace comes in handy - it helps you see what the program is actually doing at the underlying level.

CtBotsSeptember 13, 2025About 3 minLinuxPerformance AnalysisstraceSystem Calls
Analyzing Linux Slab Memory Usage

In Linux memory management, Slab is an important mechanism used by the kernel for efficient allocation of small memory blocks. By analyzing Slab memory usage, you can effectively detect kernel memory leaks and excessive cache usage issues.

Common Slab Memory Issue Troubleshooting

Abnormal Kernel Cache Growth, Insufficient System Memory

CtBotsSeptember 12, 2025About 3 minLinuxPerformance AnalysisSlabMemory Analysis
Nexus Common Error Handling

Docker Repository Push Image with Partial Layer Errors: blob unknown:blob unknown to registry

The specific error might look like this:

xxxxxx: Layer already exists
yyyyyy: Layer already exists
errors:
blob unknown:blob unknown to registry
blob unknown:blob unknown to registry
blob unknown:blob unknown to registry
CtBotsSeptember 10, 2025About 3 minDevOpsContainer TechnologyRepository ManagementNexusDockerRepository ManagementError TroubleshootingPrivate RepositoryProxy Repository
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