7.8. Building a Discovery Image

1. Open the /usr/share/foreman-discovery-image/foreman-discovery-image.ks file for editing:

   # vim /usr/share/foreman-discovery-image/foreman-discovery-image.ks

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2. Replace the repo lines in the kickstart file with the repository URLs:

   repo --name=rhel --baseurl=file:///var/lib/pulp/published/yum/https/repos/Default_Organization/Library/content/dist/rhel/server/7/7.7/x86_64
   repo --name=sat --baseurl=file:///var/lib/pulp/published/yum/https/repos/Default_Organization/Library/content/dist/rhel/server/7/7Server/x86_64/sat-capsule/6.8/os

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3. Run the livecd-creator tool:

   # livecd-creator --title="Discovery-Image" \
   --compression-type=xz \
   --cache=var/cache/build-fdi \
   --config /usr/share/foreman-discovery-image/foreman-discovery-image.ks \
   --fslabel fdi \
   --tmpdir /var/tmp

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   If you change fdi in the --fslabel option, you must also change the root label on the kernel command line when loading the image. fdi or the alternative name is appended to the .iso file that is created as part of this procedure. The PXE Discovery tool uses this name when converting from .iso to PXE.

   Use /var/tmp because this process requires close to 3GB of space and /tmp might have problems if the system is low on swap space.

4. Verify that your fdi.iso file is created:

   # ls *.iso -h

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To boot the iso file over a network:

1. To extract the initial ramdisk and kernel files from the .iso file over a network, enter the following command:

   # discovery-iso-to-pxe fdi.iso

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2. Create a directory to store your boot files:

   # mkdir /var/lib/tftpboot/boot/myimage

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3. Copy the initrd0.img and vmlinuz0 files to your new directory.
4. Edit the KERNEL and APPEND entries in the /var/lib/tftpboot/pxelinux.cfg file to add the information about your own initial ramdisk and kernel files.

1. To convert the .iso file to an .iso hybrid file for PXE provisioning, enter the following command:

   # isohybrid --partok fdi.iso

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   If you have grub2 packages installed, you can also use the following command to install a grub2 bootloader:

   # isohybrid --partok --uefi fdi.iso

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2. To add md5 checksum to the .iso file so it can pass installation media validation tests in Satellite, enter the following command:

   # implantisomd5 fdi.iso

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