We can do this pretty easily by adding a script to the /etc/profile.d directory. The script I’m currently using is below:

#!/bin/bash
#file /etc/profile.d/VirtJunkie.com-set_hostname.sh
FLAG="/var/log/firstboot.flag"
if [ ! -f $FLAG ]; then
    echo "Server will reboot after this process completes"
    echo -n "Current hostname is $(hostname). Enter the new hostname and press [ENTER]: "
    read newhostname
    sudo hostnamectl set-hostname $newhostname

    #the next line creates an empty file so it won't run the next boot
    sudo touch $FLAG
    sudo reboot now
fi

Just modify your parent image, clone your test VMs, and this will prompt you to set a new hostname the first time you log in.

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