I need to create a slightly modified Centos 6.3 Net Install ISO. The
modification is trivial, (a default kickstart in isolinux.cfg). I have
created a new ISO by loopback mounting the original, copying to a new
directory, editing and using mkisofs, and it works as expected.
However, I an unable to copy this new ISO into a USB disk using dd, in
the same manner as the original net install iso. I believe this is
because the new ISO does not include an MBR. How do I include an MBR in
the new ISO, so that it can be transferred to a USB disk via DD, in the
same way as the original ?
Thanks in advance
Chandana
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10-09-2012, 11:35 PM
Scott Silva
Net Install ISO
on 10/5/2012 7:16 PM Chandana De Silva spake the following:
> Hello All,
>
> I need to create a slightly modified Centos 6.3 Net Install ISO. The
> modification is trivial, (a default kickstart in isolinux.cfg). I have
> created a new ISO by loopback mounting the original, copying to a new
> directory, editing and using mkisofs, and it works as expected.
>
> This is how I made the new ISO:
>
> <code>
> cd my_install_directory
> sudo mkisofs -o ~/centos63-ks.iso -b isolinux/isolinux.bin -c
> isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J
> -v -T .
> </code>
>
> However, I an unable to copy this new ISO into a USB disk using dd, in
> the same manner as the original net install iso. I believe this is
> because the new ISO does not include an MBR. How do I include an MBR in
> the new ISO, so that it can be transferred to a USB disk via DD, in the
> same way as the original ?
>
> Thanks in advance
>
> Chandana
>
Can't you just modify the usb device after you create it?
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Yes, but I would like to know how it was done. It would also make it
easier in the long run for those using the iso.
On 10/10/12 10:35, Scott Silva wrote:
> on 10/5/2012 7:16 PM Chandana De Silva spake the following:
>> Hello All,
>>
>> I need to create a slightly modified Centos 6.3 Net Install ISO. The
>> modification is trivial, (a default kickstart in isolinux.cfg). I have
>> created a new ISO by loopback mounting the original, copying to a new
>> directory, editing and using mkisofs, and it works as expected.
>>
>> This is how I made the new ISO:
>>
>> <code>
>> cd my_install_directory
>> sudo mkisofs -o ~/centos63-ks.iso -b isolinux/isolinux.bin -c
>> isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J
>> -v -T .
>> </code>
>>
>> However, I an unable to copy this new ISO into a USB disk using dd, in
>> the same manner as the original net install iso. I believe this is
>> because the new ISO does not include an MBR. How do I include an MBR in
>> the new ISO, so that it can be transferred to a USB disk via DD, in the
>> same way as the original ?
>>
>> Thanks in advance
>>
>> Chandana
>>
> Can't you just modify the usb device after you create it?
>
>
> _______________________________________________
> CentOS-devel mailing list
> CentOS-devel@centos.org
> http://lists.centos.org/mailman/listinfo/centos-devel
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10-10-2012, 12:33 PM
James Pearson
Net Install ISO
Chandana De Silva wrote:
> Hello All,
>
> I need to create a slightly modified Centos 6.3 Net Install ISO. The
> modification is trivial, (a default kickstart in isolinux.cfg). I have
> created a new ISO by loopback mounting the original, copying to a new
> directory, editing and using mkisofs, and it works as expected.
>
> This is how I made the new ISO:
>
> <code>
> cd my_install_directory
> sudo mkisofs -o ~/centos63-ks.iso -b isolinux/isolinux.bin -c
> isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J
> -v -T .
> </code>
>
> However, I an unable to copy this new ISO into a USB disk using dd, in
> the same manner as the original net install iso. I believe this is
> because the new ISO does not include an MBR. How do I include an MBR in
> the new ISO, so that it can be transferred to a USB disk via DD, in the
> same way as the original ?
I believe you need to run 'isohybrid' on the new ISO - e.g. in your case:
isohybrid ~/centos63-ks.iso
isohybrid is part of the syslinux package
Also, you might want to run "hardlink" on your 'my_install_directory'
before running mkisofs - this will make the resulting ISO image a bit
smaller
James Pearson
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10-11-2012, 10:48 AM
Chandana De Silva
Net Install ISO
James,
Thank you very much for this. This is exactly what I was looking for
On 10/10/12 23:33, James Pearson wrote:
> I believe you need to run 'isohybrid' on the new ISO - e.g. in your case:
>
> isohybrid ~/centos63-ks.iso
>
> isohybrid is part of the syslinux package
>
> Also, you might want to run "hardlink" on your 'my_install_directory'
> before running mkisofs - this will make the resulting ISO image a bit
> smaller
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Net Install ISO
