diff --git a/fedora-build-opennebula-image.sh b/fedora-build-opennebula-image.sh
index 40f5d12..6222efc 100755
--- a/fedora-build-opennebula-image.sh
+++ b/fedora-build-opennebula-image.sh
@@ -134,6 +134,8 @@ run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
 run_root systemctl enable systemd-timesyncd.service
 
 # Install kernel and bootloader.
+# Note: linux-firmware is not required our environment and takes almost 200M
+# uncompressed but is a direct dependency of kernel-core...
 run_root dnf -y install kernel grub2
 run_root grub2-install --target=i386-pc "${NBD_DEVICE}"
 run_root grub2-mkconfig -o /boot/grub2/grub.cfg
@@ -150,5 +152,14 @@ UUID=$boot_uuid /boot ext4 rw,relatime,data=ordered 0 2
 UUID=$root_uuid /     ext4 rw,relatime,data=ordered 0 1
 EOF
 
+# Reset systemd's environment.
+run_root rm -f /etc/machine-id
+run_root touch /etc/machine-id
+rm -f /var/lib/systemd/random-seed
+
+# Remove temporary files and reclaim freed disk space.
+# Note: build logs could be removed as well.
+run_root dnf clean all
+
 # Make sure everything is written to disk before exiting.
 sync