Configuration Management

In-Depth Analysis of OpenWrt UCI Technology: Core Mechanisms and Implementation Principles of the Unified Configuration Interface

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In-Depth Analysis of OpenWrt UCI Technology: Core Mechanisms and Implementation Principles of the Unified Configuration Interface

In-Depth Analysis of OpenWrt UCI Technology: Core Mechanisms and Implementation Principles of the Unified Configuration Interface 1 UCI Design Philosophy and System Positioning In the field of embedded Linux, OpenWrt, as a highly modular router operating system, owes much of its success to its Unified Configuration Interface design philosophy. Before the advent of UCI, OpenWrt … Read more

Methods for Forwarding Siemens PLC Data from PC to LAN and Cloud

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Methods for Forwarding Siemens PLC Data from PC to LAN and Cloud

Continuing from yesterday’s draft, batch reading data blocks from multiple Siemens PLCs (or the V area of S7-200 smart, unidirectionally sending to N clients)Yesterday’s Go project (or compiled exe) can directly read variables from S7-200 smart, obtaining runtime data even without the counterpart program (see GitHub: s7-200smart-v-binary-viewer)New project: S7-SSE-gateway, also open-sourced on GitHub, everyone is … Read more

From init to systemd: The Architectural Evolution of Linux Daemon Management

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From init to systemd: The Architectural Evolution of Linux Daemon Management

0. Introduction Throughout the development of Linux, all components have evolved from simple yet inefficient early solutions to complex and highly optimized modern systems, and daemon management is no exception. This article will introduce the architecture, implementation mechanisms, and usage of SysV init and Systemd, illustrating the driving forces behind architectural evolution (the problems being … Read more

The Three Musketeers of Embedded Programming: Practical Uses of Structs, Unions, and Variants

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The Three Musketeers of Embedded Programming: Practical Uses of Structs, Unions, and Variants

Understand these three programming tools from a practical perspective to make your embedded code more elegant and efficient! 🎯 Introduction: Why Learn to Use Them Together? Imagine you are managing a smart home system: • Structs are like a storage box that neatly organizes related items together. • Unions are like a transformer that can … Read more

Ansible Operational Automation Practical Guide (Part 3)

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Ansible Operational Automation Practical Guide (Part 3)

1. Roles Configuration 1.1 What are Roles? Roles are Ansible’s code reuse mechanism that splits playbooks into reusable components based on functionality. 1.2 Roles Directory Structure roles/ └── nginx/ ├── tasks/ │ ├── main.yml │ ├── install.yml │ └── config.yml ├── handlers/ │ └── main.yml ├── templates/ │ └── nginx.conf.j2 ├── files/ │ └── nginx.repo … Read more

Ansible Operational Automation Practical Guide (Part II)

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Ansible Operational Automation Practical Guide (Part II)

1. Basics of Playbook 5.1 What is a Playbook? A Playbook is Ansible’s configuration, deployment, and orchestration language, written in YAML format, containing a collection of one or more plays. 5.2 Basic Syntax Structure — – name: Deploy Web Application hosts: webservers become: yes vars: http_port: 80 app_version: "1.0.0" tasks: – name: Install Nginx yum: … Read more

Ansible Network Automation Beginner’s Guide (1) – The Comeback of CLI Challengers

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🚀 Ansible Network Automation Beginner’s Guide (1) – The Comeback of CLI Challengers Network Engineer Comeback Series – Part 1 Introduction: Do you remember those days when you were called in at 3 AM for a cutover? Do you remember the shaky hands while manually configuring 100 switches? Today, I want to tell you a … Read more

Comparison between Terraform and Ansible

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Core Differences: Terraform is an “infrastructure orchestration tool” (responsible for “what to build and where to build it”, such as creating cloud servers and networks), while Ansible is a “configuration management tool” (responsible for “what to install and set after building”, such as deploying software and modifying configurations). The core use cases of the two … Read more

Ansible Series Tutorial (5): Role and Project Structured Management

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Ansible Series Tutorial (5): Role and Project Structured Management

Introduction in one sentence: Roles are the best way to organize Ansible projects, making your Playbooks modular, reusable, and maintainable. 1. Why Do We Need Roles? In previous articles, our Playbook tasks were all concentrated in one file. As the project grows, several issues arise: ·Too long files: Hundreds of lines of Playbook are hard … Read more

Linux Configuration Management

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Linux Configuration Management

Linux Configuration Management In today’s digital age, Linux, as a representative of open-source operating systems, is widely used in servers, cloud computing, embedded devices, and development environments. Configuration management is a core aspect of Linux system administration, involving system setup, maintenance, optimization, and automation. Through effective configuration management, administrators can ensure system stability, security, and … Read more