Linux Howto’s for System Administrations
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This tutorial explains how to boot into rescue mode or emergency mode in Ubuntu 22.04, 20.04 and 18.04 LTS editions. As you might already know, Runlevels are replaced with Systemd …
Most modern Linux distro uses systemd as init replacement. It is a suite of basic building blocks for Linux distros such as RHEL/CentOS & co, OpenSUSE/SUSE, Fedora, Arch, Debian, Ubuntu, …
This brief guide explains what is a runlevel, how many runlevels are there in Linux and how to check the runlevel in Linux operating systems. What is runlevel? A runlevel is one …
Whenever we update a critical library such as OpenSSL, we need to restart any daemons that use the library. Systemd with PID 1 itself also uses OpenSSL. How do you …
You should have installed or upgraded to many new Kernel versions over the time in your Linux machine. If you have multiple Linux Kernels installed on your system, how would …
We can easily enable rc.local shell script support on systemd while booting the Linux system. Traditionally, the shell script /etc/rc.local used by developers and Linux sysadmin to call other scripts …
By default, some important system services are started automatically when the system boots. For instance, the NetworkManager and Firewalld services will be automatically started at system boot. The startup services …
How do I use the systemctl command to view status of a systemd service on Linux operating systems?We use systemctl status command under systemd to view the status of the …
As a Linux administrator, sometimes you might be wondering whether you are working on a physical or virtual machine. Most of the time, you will be accessing and managing your …
As you might already know, Runlevels are replaced with Systemd targets in many recent Linux distributions like RHEL 7 / RHEL 8 and Ubuntu 16.04 LTS and newer versions. For …