Installation-instructions.md

@@ -80,8 +80,24 @@ setfacl -m "u:xrootd:r" /etc/grid-security/hostkey.pem
 
 # Start and enable xcache service running in container
 The running image has to be linked to `/var/lib/machines/xcache` in order to pick up the configuration in `/etc/systemd/nspawn/xcache.nspawn`.
+
+in case of existing installation (just updated image)
+``` 
+rm /var/lib/machines/xcache
+```
+
+In any case
 ```
 ln -s /var/lib/machines/{$img_name,xcache}
+```
+
+In case of first installation
+```
 machinectl start xcache
 machinectl enable xcache
 ```
+
+In case of existing installation (just updated image)
+```
+systemctl restart systemd-nspawn@xcache
+```
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