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Articles on Trending Technologies
Technical articles with clear explanations and examples
Creating Virtual Hosts, Generate SSL Certificates _ Keys and Enable CGI Gateway in Gentoo Linux
Setting up a web server to host multiple websites is a common task for system administrators and developers. In this guide, we will cover how to create virtual hosts, generate SSL certificates and keys, and enable CGI gateway in Gentoo Linux. Virtual hosts allow you to host multiple websites on a single server, each with their own unique domain name and content. This is useful when you want to host multiple websites with different purposes or for different clients on a single server. Enabling SSL on your website is important for security and to establish trust with your ...
Read MoreThe netcat Command in Linux
The netcat command in Linux is a powerful network utility for communication and troubleshooting. It allows users to read and write data to network connections using TCP or UDP protocols. Often called the nc command, netcat serves as a versatile tool for establishing connections, transferring files, port scanning, and network debugging. What is the netcat command? The netcat command, also known as nc, is a command-line utility that enables reading and writing data over network connections. It can establish connections to servers and clients, send and receive data, and perform various network-related tasks. Network administrators commonly use it ...
Read MoreWhere is entry of hypercalls in KVM
Kernel-based Virtual Machine (KVM) is a virtualization infrastructure for Linux that allows multiple operating systems to run simultaneously on a single host machine. It leverages hardware virtualization support, such as Intel VT-x and AMD-V, to provide efficient virtualization. A critical aspect of KVM's operation is how virtual machines communicate with the hypervisor through hypercalls. What Are Hypercalls A hypercall is a privileged instruction that allows a virtual machine to interact with the hypervisor — the software layer controlling access to physical hardware. Similar to system calls in non-virtualized environments, hypercalls enable virtual machines to request services such as ...
Read MoreDynamic Partitioning
Dynamic Partitioning is a memory management technique that allows the operating system to allocate and deallocate memory partitions of varying sizes during runtime. Unlike fixed partitioning where partition sizes are predetermined, dynamic partitioning creates and adjusts memory blocks based on actual process requirements, leading to more efficient memory utilization. How Dynamic Partitioning Works The operating system maintains a free memory list and allocates memory blocks that exactly match process requirements. When a process terminates, its memory is returned to the free list and can be merged with adjacent free blocks to prevent fragmentation. ...
Read More10 Interview Questions on Linux ls Command
If you're looking to land a job in a Linux environment, you're likely to be asked a lot of technical questions during the interview process. One of the most important commands in Linux is the ls command, which is used to list the contents of a directory. In this article, we'll explore the most common interview questions on the ls command and how to answer them effectively. What is the "ls" command, and what does it do? The ls command is used to list the contents of a directory. It displays the names of files and directories in ...
Read MoreCryptmount – A Utility to Create Encrypted Filesystems in Linux
Cryptmount is a Linux utility that allows you to create encrypted filesystems. With cryptmount, you can create an encrypted container that can be mounted as a virtual drive, and any data stored in that container will be automatically encrypted and decrypted as needed. This provides a secure way to protect sensitive data, even if your computer is compromised. What is Cryptmount? Cryptmount works by creating a virtual block device that can be mounted as a regular filesystem. The data stored on this virtual device is encrypted using strong ciphers, and a key is required to decrypt the data. ...
Read MoreWhat is buffering and spooling in a batch processing operating system?
To improve the performance and avoid CPU idle time in batch processing systems, the operating system uses two important approaches: buffering and spooling. Both techniques help optimize resource utilization by overlapping I/O operations with CPU processing. Buffering Buffering is a method of overlapping input, output, and processing of a single job by using temporary storage areas called buffers. How Buffering Works When the CPU reads data and begins processing it, the input device is immediately instructed to start reading the next input. This allows both the CPU and input device to work simultaneously. By the time ...
Read MoreFind and tar Files on Linux
One of the most powerful features of the Linux operating system is the ability to find and manipulate files quickly and easily from the command line. This can be especially useful when working with large numbers of files or when you need to automate certain tasks. In this article, we will explore two essential command-line tools for finding and compressing files on Linux: the find command and the tar command. Finding Files with the find Command The find command is a powerful tool that allows you to search for files on your Linux system based on various criteria ...
Read MoreLinux per-process resource limits - a deep Red Hat Mystery
Per-process resource limits in Linux are constraints that prevent individual processes from consuming excessive system resources like CPU time, memory, and file descriptors. These limits ensure system stability by preventing resource starvation and maintaining fair resource allocation among competing processes. Red Hat Enterprise Linux provides multiple mechanisms for implementing these limits, including traditional ulimit commands and the more advanced Control Groups (cgroups) framework. Understanding both approaches is essential for effective system administration. What are Per-Process Resource Limits? Per-process resource limits are system-enforced boundaries that restrict how much of a particular resource a process can consume. When a ...
Read MoreLinux ping Command
In the world of networking, the ability to check if a networked device is reachable is a basic requirement. One of the tools that can help us achieve this is the ping command. The ping command is a tool that sends a signal to a specified networked device, and then waits for a response. The ping command is available in almost all operating systems, including Linux. What is ping Command in Linux? The ping command in Linux is a utility that helps to test connectivity between two devices on a network. The ping command sends a request to ...
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