How Does Linux Boot Process Work?

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Animation tools: Adobe Illustrator and After Effects.

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This is a good summary, but it seems like there's a lot going on behind the scenes in all of these process, especially systemD. Would be nice to cover that in a future video :)

DK-oxze

Bravo si multumesc.E simplu, frumos pe intelesul tuturor...fara explicatii savante.CHIAR UN TUTORIAL...GENIAL DE SIMPLU!!!La mai multe inainte !!!

nelumertyk

There's a bit of a misconception about BIOS. MBR is limited to 2TB, but a BIOS doesn't need to be restricted to MBR, it could've moved to a different (likely proprietary) format... it's just that GPT and EFI were more flexible and the groundwork was already completed

danholli

One of the best boot process summary's on Youtube. Thanks for all the work and graphics.

ggattsr

Good overview, but missing a discussion of ACPI, initramfs/initrd.

ethanmye-rs

As has already been said, there is a lot going on in each of these steps.

My major criticism is that step 5 simplifies away the usual mechanism of running some code from an initial ramdisk: this is done so that the kernel does not have to contain all the device drivers needed to load whatever modules it needs before the final root partition becomes readable.

That also means that an earlier step needed to load the initial ram disk into memory and tell the kernel where to find it. Grub (or some other boot program like Lilo) will have done this already, so the Grub step should mention that it loads a filesystem containing drivers as well as libraries into ram before passing control to the kernel.

And then, in my opinion, you need an extra step between 4 and 5 for the initial ram stage, that is used to get the system able to actually read the code it needs off the disks. While it does that the kernel only needs to know how to read the initial ramdisk.

More detail follows...

There are two exceptions to what i just said

1. If you compile your own kernel you can arrange that the kernel has all the drivers it needs built in (Gentoo users might do this, knowing in advance exactly what filesystem and hardware will hold the operating system)

2. Puppy (and most Live Disk systems) boot into the ramdisk and never leave it.

For different reasons, both these exceptions slow down system loading (because either the kernel or the ramdisk is huge) but often speeds up running once the boot is complete because the kernel has what it needs in memory at all times, one way or another.

trueriver

I was expecting that you would really be talking about the kernal boot process and not everything around. But in the end, I never saw an exhaustive explanation about the boot process in the first place so I am that to know that I did not miss out anything.

eliottmax

Great summary and visualization of the entire boot process. Very well done mate!!!!

coderdojoAN

Great content, always helpful and always impressive. Thank you very much for taking the time to make these.

nicholasmaniccia

That’s beautiful and enormous work! Great thanks.

qoopdata

Great visualization of the entire boot process, Thank you.

maitreerimthong

I was looking for something like this. This is great thank you!

irvingirving

Have never such a visually stunning explanation of a boot process. Amazing video
Thankyou so so much for sharing. Piece of art with tons of knowledge

avimehenwal

This is incredibly well explained and illustrated! Thank you so much!

Zolodar

Very nicely explained and beautifully visualized presentation. I have to ask tho, would you like to make that same presentation again but for a Secured and TPM measured bootgraph ? If so, please do it, people and especially the linux community would need this in order to understand why the TPM makes booting so much more secure. I would even offer my help understanding a measured boot process (which I am pretty sure you would have no trouble understanding on your own).

baronhelmut