Why Is Linux Widely Used in DevOps Systems?

TL;DR

An operating system connects software applications with hardware resources such as the CPU, RAM, and storage. Linux is widely used in development, staging, and production because it is free, open source, secure, fast, and available through distributions such as Ubuntu, CentOS, Alpine, and Debian. Its kernel performs the central task of carrying communication between software and hardware.

Transcript

hello everyone my name is Abhishek and welcome back to my channel so today we'll be talking about Linux operating system and basics of shell scripting so if you haven't watched our previous videos on devops so just to let you know that we are doing a complete free devops course it will be a fortify uh to 40 to 45 days of devops course where we'll b... Read More

Key Insights

• An operating system is the communication bridge between software applications and physical hardware. Applications cannot directly use the CPU, RAM, or input and output resources, so their requests pass through the operating system before the hardware processes them and returns a response.
• A computer purchase fundamentally provides hardware resources such as a CPU, RAM, and storage, while the operating system makes those resources usable by applications. Vendors commonly install an operating system before delivery so users can install and run software without managing hardware communication directly.
• The request lifecycle begins when a user interacts with an application. The application passes its request to the operating system, which sends it to the appropriate hardware resource. The resulting response returns from the hardware to the operating system, then to the application, and finally to the user.
• Linux is widely used across development, staging, testing, and production environments. The lesson contrasts this professional usage with the greater familiarity many students initially have with Windows, noting that software and DevOps work frequently involves applications that are tested and deployed on Linux systems.
• Linux is free and open source, while Windows is presented as a proprietary operating system provided by Microsoft. The ability to use Linux without purchasing a proprietary operating-system license is identified as one of the primary reasons for its broad adoption in software environments.
• Linux is described as secure by default for many common uses, although it is not claimed to be completely secure. The lesson contrasts this with Windows systems that often use antivirus or anti-malware applications, while emphasizing that security is a major reason organizations select Linux.
• Linux is available through multiple distributions, including Ubuntu, CentOS, Alpine, Debian, and Red Hat. Users can select a distribution according to their needs or comfort, giving Linux flexibility across laptops, servers, application environments, and different operational preferences.
• The Linux kernel is the central component responsible for communication between software and hardware. It sits at the heart of the operating system, beneath system libraries, compilers, user processes, and system-related software, and carries application requests toward CPU, RAM, and input and output resources.

Questions & Answers

Q: What is an operating system and what does it do?

An operating system is the medium that connects software applications with computer hardware. When an application needs CPU time, memory, storage, or another input and output resource, it sends its request through the operating system. The operating system communicates with the hardware, receives the resulting response, and passes that information back to the application and ultimately to the user.

Q: Why can an application not communicate directly with hardware?

An application cannot directly manage hardware resources such as the CPU, RAM, and storage in the model described by the lesson. It needs an operating system to serve as the communication layer. The application sends a request to the operating system, which forwards it to the hardware and then returns the hardware response to the application for presentation to the user.

Q: How does a software request travel through a computer system?

The request starts with a user interacting with an installed application or other software. That application passes the request to the operating system, and the operating system sends it to the appropriate hardware resource, such as the CPU or RAM. The response then travels from the hardware to the operating system, back to the application, and finally to the user.

Q: Why is Linux widely used in DevOps environments?

Linux is widely used in DevOps because applications are frequently tested and deployed on it across development, staging, and production environments. The lesson identifies several reasons for this preference: Linux is free, open source, secure, and fast. These characteristics are especially important in production, where the operating system must process application requests efficiently without becoming slow or crashing.

Q: What is the difference between Linux and Windows in this lesson?

Linux is presented as a free and open-source operating system, while Windows is described as a proprietary operating system provided by Microsoft. Linux is also characterized as fast and secure, with less emphasis on installing separate antivirus software. Windows is familiar to many students, but Linux is described as more common for testing and deploying applications in professional software environments.

Q: Which Linux distributions are mentioned in the lesson?

The lesson mentions Ubuntu, CentOS, Alpine, Debian, and Red Hat as examples of Linux distributions. Ubuntu, CentOS, Alpine, and Debian are specifically discussed while describing popular or free distribution choices. The availability of different distributions allows users to select a Linux environment based on their comfort, preferences, and the requirements of the systems they operate.

Q: What is the Linux kernel and why is it important?

The kernel is described as the heart of the Linux operating system. Its central responsibility is to establish communication between software and hardware. When an application requires CPU, RAM, storage, or another hardware resource, the kernel handles the operating system's role in carrying that request toward the hardware and supporting the response path back to the software.

Q: What components are included in the basic Linux architecture?

The simplified Linux architecture presented in the lesson includes the kernel at its core, with system libraries above it. It also includes compilers, user processes, and system-related software. These components are installed as fundamental parts of the operating environment, while the kernel occupies the central position because it manages communication between applications and the underlying hardware resources.

Summary & Key Takeaways

• An operating system acts as the essential bridge between applications and physical hardware. A user interacts with installed software, the software sends requests through the operating system, and the operating system communicates with CPU, RAM, and storage resources. Responses then travel back through the same layers until they reach the user.

• Linux is widely used for testing and deploying applications in development, staging, and production environments. The lesson attributes this adoption to Linux being free, open source, secure, and fast. These qualities make it suitable for production systems, where operating-system speed and stability directly affect how effectively applications can process incoming requests.

• The Linux architecture introduced in the lesson consists of the kernel, system libraries, compilers, user processes, and system-related software. The kernel is described as the heart of Linux because it carries requests between applications and hardware. Understanding this relationship provides the foundation for studying Linux administration and basic shell scripting in DevOps.