Although the cpio archiving utility is nowadays used less than other archiving tools like tar, it is still good to know how it works, since it is still used, for example, to create initramfs images on Linux and for rpm packages, which are used mainly in the Red Hat family of distributions.
System Administration
How to hash passwords on Linux
Passwords should never be stored as plain text. Whether we are talking about a web application or an operating system, they should always be in hash form (on Linux, for example, hashed passwords are stored in the /etc/shadow file).
How to perform administration operations with Ansible modules
In previous tutorials we introduced Ansible and we discussed Ansible loops. This time we learn the basic usage of some modules we can use inside playbooks to perform some of the most common system administration operations.
Introduction to Wake On Lan
Wake-on-lan (also known with the “W.O.L” acronym) is a standard ethernet feature which allows a machine to be woken up on the reception of a specific type of network packet (the so called MagicPacket). The main advantage of this feature is that it allows us to keep a machine in a low power consumption state, and be accessed only when needed.
Linux path environment variable
The PATH environment variable is an essential component of any Linux system. If you ever use the command line at all, the system is relying on the PATH variable to find the location of the commands you are entering.
How to remove www from url in htaccess
As you probably noticed a long time ago, online websites can be accessed either with or without their www. prefix. For example www.linuxconfig.org and linuxconfig.org.
How to connect to VirtualBox via SSH
After installing a Linux distribution in Oracle VirtualBox, you may be wondering how you can SSH from the host operating system into the virtual machine. After all, SSH is a great way to access and manage the system on command line.
Install VirtualBox Guest Additions on Linux guest
If you’re running Linux inside a VirtualBox virtual machine, installing the Guest Additions software will help you get the most out of the system. VirtualBox Guest Additions will give the machine more capabilities, such as a shared clipboard with the host system, drag and drop file transfer, time synchronization, shared folders, automatic window resizing, and more.
LVM backup and restore snapshot in Linux
Logical Volume Manager (LVM) is used on Linux to manage hard drives and other storage devices. As the name implies, it can sort raw storage into logical volumes, making it easy to configure and use.
Change Docker root directory /var/lib/docker to another location
By default, Docker stores most of its data inside the /var/lib/docker directory on Linux systems. There may come a time when you want to move this storage space to a new location. For example, the most obvious reason might be that you’re running out of disk space.
How to manipulate Excel spreadsheets with Python and openpyxl
Python is a general purpose programming language that needs no presentations. It was originally written by Guido Van Rossum, and saw its first release in the year 1991. At the moment of writing, the latest stable version of the language is 3.10. In this tutorial we see how to use it together with the openpyxl library to manipulate Excel spreadsheets.
How to use rsync over ssh
rsync stands for “remote sync” and is a powerful command line utility for synchronizing directories either on a local system or with remote machines. It’s built into nearly every Linux system by default which allows users to perform rsync over ssh communication/backup.