From the course: Red Hat Certified System Administrator (EX200) Cert Prep: 1 Deploy, Configure, and Manage (2021)
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Understand the Linux boot process
From the course: Red Hat Certified System Administrator (EX200) Cert Prep: 1 Deploy, Configure, and Manage (2021)
Understand the Linux boot process
- [Instructor] A Linux system goes through several stages when booting. The firmware stage, the boot loader stage, the kernel stage, and lastly, the initialization stage. During the firmware stage, the computer runs code in either the BIOS or UEFI during power on self test or post. Older computers have a BIOS and newer computers have UEFI. After the firmware stage, the BIOS or UEFI executes the boot loader stage. In the case of Enterprise Linux, the boot loader is grub2, or Grand Unified Boot Loader 2. Grub's job is to read in its configuration file and boot the Linux kernel. In the case of a BIOS machine, grub reads in /boot/grub2/grub.cfg. For UEFI systems, it loads /boot/efi/EFI/redhat/grub.efi. The boot loader then executes the kernel. During the kernel stage, the kernel loads the ramdisk into memory. This ramdisk serves as a temporary route file system. This file system includes kernel modules, drivers, and…
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Contents
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Understand the Linux boot process2m
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Boot into the emergency target5m 54s
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Introduction to systemd services2m 32s
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Get systemd service status3m 56s
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Manage systemd services2m 33s
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Make systemd services persistent1m 40s
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Configure networking4m 41s
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Configure a system to use network time protocol4m 9s
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Manage one-time jobs with AT4m 4s
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Manage reccuring user jobs with cron5m 2s
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Manage reccuring system jobs with cron2m 41s
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Limiting access to AT and cron3m 41s
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