Session-38 | Booting Process of RHEL 8 Linux | Nehra Classes

Complete RHEL 8 Training Course (RHCSA+RHCE) Contents:
1) Linux history
2) Installation of RHEL 8 in EC2 (AWS) Or VMWare
3) Filesystem hierarchy
4) Getting help & man Pages
5) Working with directories
6) Working with files
7) working with file contents
8) Shell expansion: Command & Arguments
9) Shell expansion: Control Operators
10) Shell expansion: Shell variables
11) Shell expansion: Shell Embedding & Options
12) Shell expansion: Shell History
13) Shell expansion: File Globing
14) Pipes & Commands: I/O Redirection
15) Pipes & Commands: Filters
16) Basic Unix Tools
17) Regular expressions
18) VI Editor
19) User, Password & Group Management
20) Standard file permissions
21) Advanced file permissions
22) Access control lists
23) File links
24) Process Management: introduction, process priorities & background jobs
25) Disk Management: Disk Devices, Partitions, Filesystems, Mounting, UUID, RAID, LVM, iSCSI, etc.
26) Boot Management: RHEL 8 Boot Process, Bootloader, Systemd & Targets
27) Future Task Scheduling: at & crontab
28) System Logging Management
29) Memory Management
30) Resource Monitoring & Management
31) Package Creation & Management: rpmbuildup, RPM, YUM & DNF
32) Network Management: interface configuration, Configure dynamic and static network settings for IPv4/IPV6 and filter packets, routing table, SSH, NFS etc.
33) Kernel Management: About Linux Kernel, Library Management, Parameter Tuning & Kernel Compilation.
34) Backup Management
35) System Services and Security: Configure and manage system logging, time synchronization, printers, and task automation.
36) Server Security: Firewall & SELinux.
37) Basic Shell Scripting
38) Server Configuration: SSH, Telnet, FTP, NFS, CIFS/SMB, DNS, DHCP, NTP (Chrony), MySQL, MariaDB, Oracle, Puppet, Docker, Ansible, LDAP, NIS, iSCSI Target/Initiator, Jenkins, Web Servers HTTP/HTTPS, Nginx, Zabbix, NagiOS, YUM servers, Postfix, Sendmail, Dovecot, Squirrel Mail etc.
39) Reset Forgotten Root Password & Grub Password
40) Kickstart Installation of RHEL 7
41) Swap Space Management
42) High Availability Cluster Server
43) Virtualization in RHEL 8: XEN & KVM
44) RHEL Subscription Management
45) Upgrading from RHEL 7 to RHEL 8
46) Multifactor Authentication in RHEL 8
47) SSH Port Forwarding
48) Rescue System: Repair InitRAMFS
49) RHEL 8 New Features: Startis Filesystem, Cockpit Web Console, Lorex Composer Runtime, Podman Containers, Firewalld (NFTables), Chronyd (NTP), DNF & Much More.
50) Complete EC2 Module of AWS
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• Create & Manage Partit...
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[@rotrose7531]

Thank you very much, I like your passion on linux and a willingness to share all your knowledge to us.
I hope more and more English versions could be released so that everyone like Linux can benefit from these gem tutorials

[@NehraClasses]

Thanks, will do!

[@rajeshkrsinghsingh1276]

Sir awesome👍

[@harispalegar6806]

Easy to understand
Very briefly and explain very out standing sir..
Thank you so much sir

[@NehraClasses]

Thanks @Harish

[@ranapratapsingh1986]

Very useful video for linux learnees

[@NehraClasses]

Thanks @Suryanarayana

[@arunk5571]

Great content.....!

[@NehraClasses]

Thanks @Arun

[@Reon2696]

Your teaching skills are great ,. Easy to understand

[@NehraClasses]

Thanks a lot 🙏

[@saurabhkumarsinha3656]

wow . this will surely help me to crack interviews

[@arvindsharma159]

Good

[@vinay153singh]

Awesome teaching sir

[@MrHabeeb141]

Your teaching is excellent A Good Place to learn Linux keeping doing this sir

[@NehraClasses]

Thanks

[@surajmaingade]

Explained in very deep with easy understanding.... Thank you sir

[@NehraClasses]

Thanks

[@SantoshKumar-uk2re]

Well explained about booting process of rhel8.

[@mahammedrezwan8619]

Thank you for giving your valuable time to teach us

[@NehraClasses]

Thanks to you to watch our videos 🙏

[@g.mahammedrezwan7310]

So informative and easy to get it , thank you for your videos sir

[@NehraClasses]

Thanks

[@kasturisudarshan56]

Good Info

[@NehraClasses]

Thanks

[@vedhakasturi8285]

Nice Video

[@NehraClasses]

Thanks

[@KuldeepKumar-ye8bl]

Nicely expanded

[@mohammadzafarkhan4154]

Very helpful and simple way to teach thanks ❤️❤️

[@NehraClasses]

Thanks

[@crtechsolutions4243]

Good place to learn linux , keep growing sir

[@NehraClasses]

Thanks ☺️

[@hiteshsapra9814]

Thanks. Nice video.

[@lilylawer]

Simple way : understanding the same

[@Hardik-li2kd]

Thanks a lot sir ❤️

[@IronMan-zk7hz]

Thank you for your videos 👍❤️

[@NehraClasses]

Thanks

[@SantoshKumar-uk2re]

Nice video sir.

[@podishettivikram8681]

Nice explanation sir

[@yogeshwaranify]

Very useful sir

[@ameerbasha7718]

You doing good job sir

[@NehraClasses]

Thanks dear 🙏

[@Akashpatil-pf6hm]

Great video 👍👍

[@NehraClasses]

Thanks

[@govi28]

Question. RHEL still uses MBR for the boot partition? In general what makes BIOS/MBR vs UEFI/GPT selection?

[@luciferlucifer3010]

Nice videos 👍🙏👌👌

[@NehraClasses]

Thanks

[@Ana-vd1rl]

In interview if I just say the overview of this process will it be ok?

[@NehraClasses]

Yes

[@ShirishShukla7776]

sir ji be clear your info with man boot, its bios -> post
en.wikipedia.org/wiki/Linux_startup_process
When the Linux system powers up, the BIOS kicks in and performs a Power On Self Test (POST)

[@NehraClasses]

When the computer first looks at the BIOS, it begins the power-on self-test (POST) sequence to make sure the components in the computer are present and functioning properly. If the computer does not pass any of these tests, it will encounter an irregular POST. An irregular POST is a beep code that is different from the standard one or two beeps. For example, an irregular POST could generate no beeps at all or a combination of different beeps to indicate the cause of the failure.
If the computer passes POST, it looks at the first 64-bytes of memory located in the CMOS chip, which is kept alive by the CMOS battery even when the computer is turned off. This chip contains information such as the system time and date and information about all the hardware installed in your computer.
After loading the CMOS information, the POST will begin inspecting and comparing the system settings with what is installed in the computer. If no errors are found it will then load the basic device drivers and interrupt handlers for hardware such as the hard drive, keyboard, mouse, floppy drive. These basic drivers allow the CPU to communicate with these hardware devices and allow the computer to continue its boot process.
Next, the POST will check the real-time clock (RTC) or system timer and the computer system bus to make sure both of these are properly working on the computer. Finally, you'll get a picture on your display after the POST has loaded the memory contained on the display adapter and has made it part of the overall system BIOS.
Next, the BIOS checks to see if it's performing a cold boot or warm boot(reboot) by looking at the memory address 0000:0472. If it sees 1234h the BIOS knows that this is a reboot and skips the remainder of the POST steps.
If 1234h is not seen, the BIOS knows that this is a cold boot and will continue running additional POST steps. Next, it tests the computer memory (RAM) installed in the computer by writing to each chip. With early computers, you can see it performing the step as it counts the total installed memory as it's booting.
Finally, the POST will send signals to the computer floppy, optical, and hard drive to test these drives. If all drives pass the test, the POST is complete and instruct the computer to start the process of loading the operating system.

[@ShirishShukla7776]

@@NehraClasses yes its BIOS which initiated POST .. not computer :) (w/ firmware no action on h/w)

[@NehraClasses]

Instead of bios i should have called it CMOS with updated setting in second step of booting.

[@user-io5us2sy9u]

it's not bad about linux course, but it is a pain to listen to your english. :(

[@NehraClasses]

Nobody needs your suggestions.