Linux System Administration

This course covers Linux networking and security: how systems connect and communicate over a network, and how to protect them from unauthorized access and attack. These are two central responsibilities in system administration. You'll start with networking foundations, including what a network is, the OSI model, IP addressing, and the theory behind TCP, UDP, ports, and DNS. You'll then run networking commands to analyze interfaces and routing, test connectivity, and use DNS tools to diagnose name resolution. The course then covers interface configuration and traffic analysis. You'll map network services to ports and processes, capture and filter live traffic with tcpdump, and monitor bandwidth and network performance to troubleshoot issues end to end. It closes with remote access, security, and hardening: configuring SSH key-based authentication and secure file transfer, managing firewall rules and access control, scanning systems with nmap, hardening SSH services, and applying Fail2ban intrusion prevention. By the end of this course, you will be able to: - Configure and analyze network interfaces, routing, and active connections. - Explain the OSI model, IP addressing, and the roles of TCP, UDP, ports, and DNS. - Diagnose connectivity and DNS resolution issues using command-line tools. - Capture and filter network traffic with tcpdump and monitor performance. - Secure remote access using SSH key-based authentication and file transfer. - Harden Linux systems with firewall rules, nmap scanning, and Fail2ban. This course is intended for system administrators, DevOps engineers, and aspiring security professionals. Learners should be comfortable with the Linux command line, Learn to configure, diagnose, and secure Linux systems on a network.

This course introduces the foundations of Linux from the command line, helping you understand how the operating system that powers most of the world's servers and cloud infrastructure actually works, and how to control it directly through the terminal. You'll begin by setting up your own Linux environment using a virtual machine or WSL2, then learn to navigate the filesystem with confidence — moving between directories, listing and exploring files, and locating anything using pattern matching and file discovery. From there, you'll create, move, copy, and link files and directories, and understand how the Linux filesystem and architecture fit together.The course then moves into reading and searching file content, where you'll inspect files, filter data, and run recursive searches across the system. Finally, you'll bring it all together with the tools that make the command line powerful: standard streams and output redirection, the pipe operator and command chaining, and a full text-processing suite including grep, sort, uniq, sed, and awk. By the end of this course, you will be able to: - Set up a Linux environment and navigate the filesystem from the command line. - Create, move, copy, and link files and directories using core commands. - Search and filter file content using pattern matching and regular expressions. - Manage standard streams and redirect command output and errors. - Chain commands together using pipes, tee, and command sequencing. - Process and transform text data using grep, sort, uniq, sed, and awk. Designed for complete beginners, aspiring system administrators, and developers looking to expand their skills, this course provides a solid foundation for everything that follows in Linux administration. No prior Linux experience is required — just a computer and a willingness to work in the terminal. Begin your Linux journey and discover how the command line gives you direct, powerful control over any system.

This course covers shell scripting with Bash, focusing on how to automate repetitive administrative work and turn sequences of commands into reusable, reliable programs that run on demand or on a schedule. You'll start by writing and executing scripts, using variables, arrays, and string operations to store and manipulate data. You'll then add logic with conditionals, loops, and control flow, and build an automation script that ties these concepts together. The course then moves to modular, maintainable scripting. You'll create functions and work with parameters, parse command-line arguments, validate input, and handle errors so scripts run reliably without supervision. You'll automate routine tasks using cron and at for scheduled execution. It closes with advanced techniques: Bash parameter expansion and manipulation, and text processing with sed and awk, including combining the two tools and debugging scripts. By the end of this course, you will be able to: - Write and execute Bash scripts using variables, arrays, and string operations. - Apply conditionals, loops, and control flow to add logic to scripts. - Build modular scripts using functions and parameters. - Parse command-line arguments and validate input for reliable execution. - Handle errors and debug scripts. - Automate and schedule recurring tasks using cron and at. - Process and transform text data using parameter expansion, sed, and awk. This course is intended for system administrators, DevOps engineers, and developers who want to automate Linux workflows. You should already be comfortable working at the Linux command line. Join us now and learn to write dependable automation and reduce the manual, repetitive parts of working with Linux.