Linux Runlevels Explained

A runlevel is one of the modes that a Unix -based operating system will run in. Each runlevel has a certain number of services stopped or started, giving the user control over the behavior of the machine. Conventionally, seven runlevels exist, numbered from zero to six. After the Linux kernel has booted, the init program reads the /etc/inittab file to determine the behavior for each runlevel. Unless the user specifies another...

Read More

Soft Link and Hard Link

First we Need To Know About Inodes    Hard links and soft link is an important concept in the Linux file system, which relates to the index node in the file system (inode). Inode is one of the four basic concepts in Linux virtual file system (VFS). Through the analysis of the relation and the difference between hard links and soft links, we...

Read More

RHCSA Series: How to Manage Users and Groups in RHEL

 How to Manage Users and Groups in RHEL  Download Your Free eBooks NOW - 10 Free Linux eBooks for Administrators | 4 Free Shell Scripting eBooks Managing a RHEL 7 server, as it is the case with any other Linux server, will require that you know how to add, edit, suspend, or delete user accounts, and grant users the necessary permissions to files, directories,...

Read More

Process Management In Redhat

We will start this article with an overall and brief revision of what happens since the moment you press the Power button to turn on your RHEL 7 server until you are presented with the login screen in a command line interface. Linux Boot Process Please note that: 1. the same basic principles apply, with perhaps minor modifications, to other Linux distributions as well,...

Read More

Installation of Red Hat Enterprise Linux 6.0

Installation of Red Hat Enterprise Linux 6.0: Boot the system with RHEL 6.0 DVD. At the boot prompt, hit enter to begin installation: Skip the media testing process: Click Next: Select your preferred Language and hit Enter: Select your keyboard layout: Select Basic storage Devices. If you install this in SAN environment select Specialized Storage Devices and...

Read More

LINUX BOOT PROCESS

6 Stages of Linux Boot Process (Startup Sequence) Press the power button on your system, and after few moments you see the Linux login prompt. Have you ever wondered what happens behind the scenes from the time you press the power button until the Linux login prompt appears? The following are the 6 high level stages of a typical Linux boot process. 1. BIOS BIOS...

Read More

Linux system administration commands

Linux system administration commands halt This command shuts down the operating system, but can only be run by the root user. #halt reboot This command shuts down and restarts the operating system. It also can only be run by root. #reboot [will perform simple reboot] #reboot -f [will perform fast reboot ] init 0 This command also shuts...

Read More