Debugging Linux Systems

This course will guide you through the complexities of the Linux operating system, from a strong understanding of the Linux kernel to invoking system calls, process management, and file operations. You will also learn threading and interprocess communication techniques.

Linux, the most widely used operating system for servers worldwide. This is a story about the basic commands of CLI (Command Line Interface), the first step to freely handling Linux, and shell scripts created by combining those commands. This lecture resolves the questions and concerns that anyone interested in Linux would have had at the beginning.

Now I can analyze the Linux kernel too! The easiest kernel lecture among all Linux kernel courses.

The author of "Learning the Structure and Principles of the Linux Kernel Through Debugging" provides a thorough explanation of the core interrupt concepts of the latest Linux kernel (v6.1), which are most widely used in system software.

✅ Out of the entire series (1) ~ (7), (5) operating system, user interface, database ✅ CS101 series lectures - From basic computer theory to the latest practical examples - Provides a wide range of basic knowledge

The author of "Learning the Structure and Principles of the Linux Kernel Through Debugging" provides a proper explanation of the core concepts of 'Interrupt Bottom Halves' in the latest Linux kernel (v6.1), which is most widely used in system software.

From the fundamentals of systems engineering to security setup, this course will guide you along the way.

This course puts an end to operational vulnerabilities in Linux servers caused by incorrect permissions. Completely master file and directory permission control based on real-world practical standards.

This is a 'Practical Linux Troubleshooting Course' where you analyze and solve problems together with generative AI, based on a Docker practice environment that reproduces 5 representative failures that occur in actual Linux operating environments. Even those who were overwhelmed about where to start examining problems can learn the problem-solving approach and thought process of field engineers through AI guidance.

Many people use Docker, but few understand its underlying principles. Without understanding these principles, you can only rely on searching for answers when problems arise, rather than solving them yourself. The essence of Docker lies in the operating system. This course is not a superficial overview of memorizing a few commands; it delves deep into the inner workings of the operating system that makes up Docker. Once the internal structure becomes visible, Docker is no longer difficult.

From Theory to the Field: Proving Core Competencies of a Security Expert through Wazuh+ELK SIEM Implementation Design and operate a Threat Hunting system, the core of security monitoring, firsthand. Through hands-on practice based on real-world attack scenarios, transform into a professional security engineer capable of delivering immediate results in the field.

Build a hands-on AWS environment with Terraform and learn Zabbix 8’s new features and practical monitoring operations through exercises in fault detection, Slack notifications, and recovery. Store JSON values using Zabbix 8’s Native JSON, then split out the required values with Dependent items and JSONPath. Organize the display columns for recent data and the problem overview, and compare metrics using scatter plots and inverted graph axes. Export the completed Dashboard as YAML and import it again. This course also covers the Server, Agent 2, Item, and Trigger components required for existing Zabbix operations, along with problems and recovery, Slack notifications, maintenance, official MySQL and Redis templates, and Web scenarios. Create and recover CPU, disk, Apache, and HTTP problems yourself to connect the entire workflow. Create and clean up the AWS hands-on environment with Terraform. Follow the actual sequence: saving configuration files, running fmt, init, validate, and plan, applying the saved plan, connecting via SSH, checking the state, and cleaning up the practice resources.

This is a C programming course for those who wish to pursue a path as a professional developer rather than just a hobbyist. I recommend this to those who are willing to learn through bitter and rigorous study to reach a sweet destination!

Linux for Beginners: Mastering the Command Line. The ultimate course for Linux administration in corporate jobs. Unlock the power of the Linux operating system with this comprehensive beginner-friendly course. Whether new to IT or wanting to advance technical skills, this course will take one from zero to proficient in Linux fundamentals. Learn to navigate the command line, manage files and directories, handle permissions, and automate tasks with shell scripting. What You'll Learn: How to Navigate the Linux File System and Master the Command Line Managing users, groups, and file permissions for secure access Installing, updating, and removing software with package managers Basic system administration and troubleshooting skills With hands-on labs and real-world examples, you’ll quickly build confidence in managing Linux environments. By the end of this course, you’ll have a strong understanding of essential Linux concepts like file permissions, process management, and network configuration. Also, this course covers basic networking, disk management, and process monitoring. Whether you have a career goal in the realms of DevOps, cybersecurity, or cloud engineering, learn Linux today to make more career opportunities pop open in IT, DevOps, SRE, Support, IT helpdesk, IT Admin, cybersecurity, or software development! Practical Skills for Self-Confidence on Any Linux-based System Boost Your Tech Portfolio

Creating an application on Linux (Ubuntu OS). (Cross-platform application development)

I have created a 'Linux for Beginners' course that is easy for non-majors to understand and can be applied in practice immediately!

This course focuses not simply on how to configure NGINX, but on solving the problems that arise in interviews and real-world work when you do not understand why these structures and configurations are necessary. Based on experience serving as an interviewer at Naver, Kakao, and Toss and evaluating countless candidates, the course explains, with hands-on practice, how to describe and use NGINX from the perspectives of performance, scalability, and operations. The core of this course is helping you develop a way of thinking that allows you to understand traffic flow and track down problems, rather than merely memorize configuration values.

We will create a remote development environment using VS Code and extensions, and learn about WSL and code-server, a VS Code used on the web.

In this course, you will learn how to have a free Linux server worth 20,000 won per month, how to use it, and how to utilize it.

This course covers essential content that C# application developers with 0.5 to 3 years of experience must know.