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Note

To ensure system/os stability, Please follow the below steps in a Ubuntu VM with moderate configurations created using any tools like VirtualBox, Qemu, etc
Please use root user to perform below steps

Download CentOS minimal iso from the below link / any other link.  File size will be around 1 GB.

https://mirror.umd.edu/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-1908.iso

1. Mount the centos iso file

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Note

-V <name> --> must match with isolinux/isolinux.cfg file's label attribute

In isolinux.cfg LABEL=CentOS\x207\x20x86_64 --> \x20 represents space character.  
So, in -V <name> --> we can represent space instead of \x20

Example cmd:
mkisofs -r -T -J -V "CentOS 7 x86_64" -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o ../newimage.iso .

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