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Linux Sys Admin
• Lab Setup
• Linux Virtual Filesystem
• Basic Storage Partition
  • Why Disk Partition ?
  • Storage Overview
  • Disk Types
  • Interacting With Disks
  • Disk Partition
  • Backup Partition
  • File As Disk
• Advanced Storage Partition
  • LVM
  • RAID
  • swap
  • Quotas
  • Encryption
• Operation of Running Systems
  • Boot Process
  • Grub
  • Kernel
  • Systemd

systemd

What is systemd? systemd consists of these components: systemd, which is the system and service manager systemctl, a command line tool to interact with systemd journald, a unified logging framework logind, a daemon that handles user logins and seats resolved, timesyncd, and networkd, which are responsible for network connection, domain name resolution and synchronizing time with internet resources Managing existing services A service is essentially a process, running in the background and managed/provisioned by systemd.

July 6, 2021 Read

Grub

About Virtually, all x86-based Linux systems (outside the embedded sphere) today use GRUB (GRand Unified Bootloader) to handle the early phases of system startup. Other platforms may have other equivalents, such as ELILO used on EFI systems such as IA64 (Itanium), and Das U-BOOT used on many embedded configurations. Some important features of GRUB are: Alternative operating systems can be chosen at boot time. Alternative kernels and/or initial ramdisks can be chosen at boot time for a given operating system.

April 23, 2021 Read

Kernel

About Linux is only the kernel of the operating system, which includes many other components, such as libraries and applications that interact with the kernel. The kernel is the essential central component that connects the hardware to the software and manages system resources, such as memory and CPU time allocation among competing applications and services. It handles all connected devices using device drivers, and makes the devices available for operating system use.

April 23, 2021 Read

Boot Process

In this post we will take about the boot process of linux OS Stages There are 4 Stages and they are: The Firmware Phase (BIOS and UEFI integrity check) (POST) The Bootloader Phase The Kernel Phase (initialization) Starting Systemd, the parent of all processes Firmware Phase The firmware is the BIOS (Basic Input/Output System) or the UEFI (Unified Extensible Firmware Interface) code that is stored in flash memory on the mother board.

April 22, 2021 Read