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I'm creating a custom image of CentOS 6.2 with an automated kickstart installation based on CentOS-6.2-i386-netinstall.iso. I've successfully created an ISO image that boots the installer, but it seems to download /install.img every time, even if the file exists on my ISO.

The original netinstall image seems to contain images and isolinux directories in its root, and replicating this on my custom image doesn't seem to work (as in, the installer always downloads the file from a mirror). Where should the install.img file be located or is this some forced behavior of the netinstall image?

I tried including the images directory within the isolinux as well, but it didn't seem to have any effect.

This is what I'm including in the ISO:

# ls -lR
.:
total 12
drwxr-xr-x. 3 root root 4096 Oct 26 00:43 images
drwxr-xr-x. 2 root root 4096 Oct 25 23:41 isolinux
-rw-r--r--. 1 root root  912 Oct 25 23:13 ks.cfg

./images:
total 132524
-r--r--r--. 1 root root       442 Oct 26 00:43 TRANS.TBL
-rw-r--r--. 1 root root 135696384 Oct 26 00:43 install.img
drwxr-xr-x. 2 root root      4096 Oct 26 00:43 pxeboot

./images/pxeboot:
total 32236
-r--r--r--. 1 root root      441 Oct 26 00:43 TRANS.TBL
-rw-r--r--. 1 root root 29189501 Oct 26 00:43 initrd.img
-rwxr-xr-x. 1 root root  3811616 Oct 26 00:43 vmlinuz

./isolinux:
total 32584
-r--r--r--. 1 root root     1996 Oct 25 22:36 TRANS.TBL
-r--r--r--. 1 root root     2048 Oct 25 22:36 boot.cat
-rw-r--r--. 1 root root       84 Oct 25 22:36 boot.msg
-r--r--r--. 1 root root      142 Oct 25 22:36 grub.conf
-rw-r--r--. 1 root root 29189501 Oct 25 22:36 initrd.img
-r--r--r--. 1 root root    24576 Oct 25 23:42 isolinux.bin
-r--r--r--. 1 root root     1005 Oct 25 22:38 isolinux.cfg
-r--r--r--. 1 root root   151230 Oct 25 22:36 splash.jpg
-r--r--r--. 1 root root   162860 Oct 25 22:36 vesamenu.c32
-rwxr-xr-x. 1 root root  3811616 Oct 25 22:36 vmlinuz
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1 Answer 1

My guess is that you need to edit isolinux/isolinux.cfg for that.

If it doesn't help, why don't you base your custom ISO off an ordinary CentOS-6.2-x86_64-bin-DVD1.iso? It seems to be closer to what you seem to want to do. If I understand correctly, you want to create a CentOS installation ISO without all the RPMs. If it's the case, in your kickstart file, add --url ... option to the install clause.

Edit: just to clarify the above, I think that the correct way to do this is to use an ordinary .ISO (i.e. not netinstall) and strip all the RPMs from it. I think (not sure) that the netinstall inherently downloads the install.img, while an ordinary installation ISO doesn't.

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Yes, netinstall is an image without the RPMs. I already use the --url setting, and that seems to cause the install.img download. isolinux has nothing that would point to the existing install.img file. –  eclaird Mar 27 '12 at 12:39

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