create an ISO with kickstart file only

infrastructure-guide/initial_setup.md

@@ -22,6 +22,10 @@ The steps involved to bootstrap the boot server and the repository server are th
     ```
     mkksiso lx-boot-dmz-01.psi.ch.ks rhel-8.7-x86_64-boot.iso  lx-boot-dmz-01-rhel-8.7-x86_64-boot.iso
     ```
+    Alternatively create a second iso file with just the kickstart file. Place the kickstart file as `ks.cfg` in an directory and run:
+    ```
+    mkisofs -volid OEMDRV -output $TARGET_HOSTNAME-kickstart.iso $DIR_WITH_KICKSTART_FILE
+    ```
 
 1. Remote Login (via RDP) to vmsmgt.psi.ch and mount the ISO to the VM
 
@@ -34,6 +38,8 @@ The steps involved to bootstrap the boot server and the repository server are th
         ![](initial_setup/mount_iso_menu.png)
         ![](initial_setup/mount_iso.png)
 
+    1. If you have a separate kickstart iso file, you need two CD drives and connect both iso files.
+
     1. Start the VM to trigger the install
 
 ```{note}