In the office I use Red Hat quite often and one of the quicker ways to provision a Red Hat server is via kickstart. There are many ways to reach a kickstart file during initial install (NFS, HTTP, FTP) but one of the ways I commonly use is to put the file on the installation DVD itself.
The below steps are what I use to add a custom directory to the installation iso file.
Mount the official ISO as a directory
In order to access the contents of the ISO file we can mount it as a file system.
# mkdir -p /mnt/linux # mount -o loop /tmp/linux-install.iso /mnt/linux
Copy the contents to a working directory
Since the ISO is read-only we will need to copy the contents into another directory that we can modify and add what we want.
# cd /mnt/ # tar -cvf - linux | (cd /var/tmp/ && tar -xf - )
Make your changes
At this point you can add to or modify any of the files and directories in the
Repackage the directory into a new ISO file
Once finished we will repackage the directory into a new boot-able ISO file.
# cd /var/tmp/linux # mkisofs -o ../your-new.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -J -R -V Your Disk Name Here .