Installation-instructions.md

@@ -41,10 +41,7 @@ mkosi -i -t directory -o /var/lib/machines/xcache-$(date +%Y-%m-%d-%H%M)
 # Build image (manual `dnf --installroot`)
 ```bash
 img_name=xcache-$(date +%Y-%m-%d-%H%M)
-dnf -y --installroot /var/lib/machines/$img_name --releasever=7 install system-release bash yum
-rsync -av /var/local/mkosi/mkosi.extra/ /var/lib/machines/$img_name
-cp /var/local/mkosi/mkosi.postinst /var/lib/machines/$img_name
-systemd-nspawn -D /var/lib/machines/$img_name bash /mkosi.postinst
+build_image.sh /var/lib/machines/$img_name
 ```
 
 # Create xrootd user in host system