where is the kernel and initrd file located in CentOS ISO File

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kraomohsin75
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where is the kernel and initrd file located in CentOS ISO File

Post by kraomohsin75 » 2021/07/31 12:11:46

Hi there,

I am trying to boot my system directly from ISO file. I am following this tutorial
https://www.howtogeek.com/196933/how-to ... ard-drive/
this is for ubuntu. But I want to know where is the kernel and initrd file is located in centos iso file.
i am looking forward to hearing from you soon.

Many thanks,
Rao
Many Thanks,
Rao

Mike_Rochefort
Posts: 200
Joined: 2016/03/16 02:34:19

Re: where is the kernel and initrd file located in CentOS ISO File

Post by Mike_Rochefort » 2021/07/31 19:39:21

Though I can't attest to this methodology, the items you are looking for are in the isolinux/ directory of the ISO file.

Code: Select all

$ mkdir /tmp/mnt && mount -o loop CentOS-[Stream-]<version>-<arch>-dvd1.iso /tmp/mnt
$ ll -h /tmp/mnt/isolinux
-r--r--r--. 1 root root 2.0K Jun  1 16:39 boot.cat
-r--r--r--. 1 root root   84 Jun  1 16:21 boot.msg
-r--r--r--. 1 root root  293 Jun  1 16:21 grub.conf
-r--r--r--. 2 root root  72M Jun  1 16:20 initrd.img     # <----
-r--r--r--. 1 root root  38K Jun  1 16:21 isolinux.bin
-r--r--r--. 1 root root 3.1K Jun  1 16:21 isolinux.cfg
-r--r--r--. 1 root root 114K Nov 18  2020 ldlinux.c32
-r--r--r--. 1 root root 177K Nov 18  2020 libcom32.c32
-r--r--r--. 1 root root  23K Nov 18  2020 libutil.c32
-r--r--r--. 1 root root 179K Nov 16  2020 memtest
-r--r--r--. 1 root root  186 May 26 15:44 splash.png
-r--r--r--. 1 root root 2.9K Jun  1 16:39 TRANS.TBL
-r--r--r--. 1 root root  27K Nov 18  2020 vesamenu.c32
-r-xr-xr-x. 2 root root 9.6M Jun  1 12:22 vmlinuz     # <----
Copies of these also exist in images/pxeboot/. Just bear in mind the CentOS 8 ISO contents are installer only, not a live environment if that's part of your aim for doing this.

Cheers,
Mike
Junior Solutions Architect @RedHat | RHCE
Feature animation enthusiast formerly @BlueSkyStudios and @Pixar
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