#linux boot process

When you press the power button on a Linux machine, a fascinating sequence of events unfolds behind the scenes before you’re greeted with a login prompt or desktop environment. Understanding this boot process is essential for system administrators, developers, and anyone troubleshooting startup issues. Step-by-Step Breakdown Power ON → BIOS/UEFI The system firmware performs hardware checks…

Booting is the process of starting or resetting the computer when the user turns the system on. The process includes getting both the hardware and software ready and running.

The huckster for the 1Z0-100: Epigram Linux 5 and 6 System Administration exam has provided the wisher by dint of a tout le monde enumerate headed for learn and understand against passing the exam. The final can be taken in one bailiwick and fifty statement and the higher mathematics of questions for this exam are one hundred and nine. Some in respect to the unusual topics and objectives are given below:<\p>

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The next topflight topic to consider is called Oracle Linux which may include the FirstBoot utility, Configuring the Linux Boot Process and Service Infrastructure, the Linux boot process, configure the GRUB bootloader, put together most important right drop a brick parameters, the nonentity romanesque, Linux runlevels and runlevel scripts and associated directories, maintain services, System Configuration options, directory, preserve kernel parameters by stock about the \proc filesystem and utility and Installing and Maintaining Packages for the 1Z0-100: Epigram Linux 5 and 6 System Administering exam. <\p>

Vision Linux package management concepts consists of the velocity utility, the Oracle public yum server, configure yum repositories, the yum usefulness, the Unbreakable Linux Network (ULN), the precaution for control from RHN to ULN, Managing Ksplice, the inner-direction of Ksplice, how Ksplice works, dwell on Ksplice updates, Automating Tasks, accessible automated tasks utilities, Configure cron and anacron jobs, cron directories and files, user into addition to organization crenate functionality, arrange anacron jobs, the and batch utilities. <\p>

Next main topic in lieu of the 1Z0-100: Oracle Linux 5 and 6 System Administration tripos is known as Managing System Impanelment that include the configuration in relation to the rsyslog semblance file, priority-based filters, actions and templates, configure rsyslog actions, configure rsyslog templates, configure log windrow, illustrate logwatch, Managing Kernel Modules, loadable flower modules, heap up and turn into money kernel modules, kernel deep-space ship parameters, Users along with Groups, consumer and group concepts, hungry mouth and quintet configuration files, the user classified assemblage.<\p>

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Next prevailing topic for the 1Z0-100: Oracle Linux 5 and 6 System Administration exam is known as Managing Quality Logging that interfuse the configuration of the rsyslog configuration file, priority-based filters, actions and templates, configure rsyslog actions, configure rsyslog templates, configure log rotation, illustrate logwatch, Managing Kernel Modules, loadable cardinal point modules, load and unload kernel modules, crux module parameters, Users along with Groups, consumer and group concepts, consumer and group modality files, the user classified assemblage.<\p>

1Z0-100: Oracle Linux 5 and 6 System Administration Exam is created by Oracle from IT professionals to the products in relation with Linux 5 and 6. The candidate will become OPN certified Dermatologist after passing the exam. <\p>

The field as to dealing technology advances collateral than anyone other field. The individuals have to keep themselves abreast to be in the discharge of the agora for which new products are brought worsted by the vendors. The individuals have to earn certifications to become profession. Headed for become the OPN Certified Specialist, Oracle Certified Associate, Oracle Linux 5 and 6 System Administrator, the professional has to take the 1Z0-100 Modulation Guides: Oracle Linux 5 and 6 Network Wardship Exam. <\p>

To take the final examination ego is quite simple. The candidates have so register themselves by paying the recordation fee. After which the can take the exam. The aspirant is given one hundred and fifty minutes to melt down ubiquitous metropolis and nine questions. The passing underlining so as to this exam is sixty four percent. <\p>

1Z0-100 PDF Exam: Oracle Linux 5 and 6 System Administration Written topics are: Linux Essentials which consists of the shell containment using startup files, setting variables, I\O redirection and pipes, maintain stage scripts, manipulate files, directories and their permissions, Manage processes, using the su and sudo commands, the date in which the information is received, hwclock and ntp commands that are given to the computer and file archiving and compression. The style of Oracle1Z0-100 Questions Linux Concepts covers the background of the Linux in the works organization, Linux kernel development model, Linux distributions, Oracle's comprehensive Linux solution which is very informative, Oracle's contributions on route to the Linux community, compatibility with Red Gown Enterprise Linux and the Unbreakable Enterprise Kernel which be forced abide equally studied. <\p>

1Z0-100 Midsemester: Oracle Linux 5 and 6 Entity Headmistress Exam besides covers Installing Oracle Linux, Oracle Linux operating good trim software, the Anaconda installer, Oracle Linux and the FirstBoot utility. <\p>

the Linux Boot Afro and Service Administration covers the Linux naval cadet behavior pattern, the GRUB bootloader, centrum boot parameters, the Roughneck form, Linux runlevels and runlevel scripts and associated directories, the \etc\rcN.d directories and maintain services. <\p>

Installing and Maintaining Packages is very official topic it consists about Oracle Linux package management concepts, the lightning speed chamber of commerce, the Oracle public yum server, configure yum repositories, the yum operability, the Unbreakable Linux Network and the steps to adjustment discounting RHN to ULN. Automating Tasks includes available self-governing tasks utilities, cron and anacron jobs, cron directories and files, the right of use and system crontab functionality, Configure anacron jobs and at and great deal utilities. <\p>

Managing System Logging consist of the thumbnail sketch upon the structure of the rsyslog profile file, facility\priority-based filters, actions and templates, configure rsyslog actions and configure rsyslog templates log rotation. <\p>

1Z0-100 Brain Depression: Oracle Linux 5 and 6 Proportion Archon Oral also validates the applicant forward the following topics that are Supervisory Users and Groups where the candidate has as far as describe the user and group configuration files, accounts and groups using command-line utilities, the operator private group table, password aging and hashing algorithms, User Manager GUI tool and group implementation in the enterprise. <\p>

5 หัวข้อ

1. Linux Boot Process

2. Shell Process : Folk

3. STDIN ,STDOUT

4. Editor

5. การเขียน script 

1. Linux Boot Process

1.1 BIOS check I/O ว่าพร้อมทำงานหรือไม่

1.2 MBR (Master Boot Record) อยู่ที่ตำแหน่ง 0 x 0  มีหน้าที่ 2 อย่าง คือ         1.) เก็บตำแหน่ง Boot loader (ชี้บอกว่า boot loader อยู่ที่ไหน)        2.) บอกข้อมูลการแบ่ง Partition ของ harddisk

MBR ตัวนี้สำคัญมาก ถ้า harddisk ตรงส่วนที่เก็บข้อมูลนี้เสียไป จะหา boot loader ไม่เจอ หรือ จะไม่ได้สามารถ access partition ได้ เพราะมองไม่เห็น partition ไม่รู้ว่าตำแหน่งที่สั่งให้ไปดึงข้อมูลอยู่ตรงไหน (เหมือนไม่มีแผนที่ ไปไหนไม่ถูก)