Many people ignore learning about this process, including me as well. When I started learning Linux at the first time, I did not care that this boot process is very important especially for troubleshooting Linux server; in case, the grub is corrupt or forgotten password. Normally, the shortcut will be erasing or formatting the whole hard disk and start installing all over again.
Steps of Boot Process:
1. If your CentOS or RHEL is properly installed, the BIOS points to the GRUB boot loader.
Most of the time, GRUB boot loader is located in the appropriate master boot record (MBR).
2. Then the next step is GRUB points to and initializes the Linux kernel.
3. Starting init as the first Linux process.
4. The init process then initializes the system and moves into appropriate runlevels.
5. When Linux boots into a specific runlevel, it starts a series of services.
6. The good news is we can customize this process.
Steps of Boot Process:
1. If your CentOS or RHEL is properly installed, the BIOS points to the GRUB boot loader.
Most of the time, GRUB boot loader is located in the appropriate master boot record (MBR).
2. Then the next step is GRUB points to and initializes the Linux kernel.
3. Starting init as the first Linux process.
4. The init process then initializes the system and moves into appropriate runlevels.
5. When Linux boots into a specific runlevel, it starts a series of services.
6. The good news is we can customize this process.
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