howto/ganeti.md

@@ -1322,6 +1322,19 @@ IRC, in `#tor-project`, as instances are rebooted.
 
 A full fleet reboot took about 2 hours, if all goes well.
 
+Note that you can cancel a node reboot with `--kind` cancel. For
+example, say you were currently rebooting node `fsn-node-05`, you can
+hit <kbd>control-c</kbd> and do:
+
+    ./reboot -H fsn-node-05.torproject.org --kind=cancel
+
+... to cancel the reboot of the node and its instances. This can be
+done when the following message is showing:
+
+    waiting 10 minutes for reboot to complete at ...
+
+... as long as there's still time left of course.
+
 ### Node-only reboot
 
 In certain cases (Open vSwitch restarts, for example), only the nodes
@@ -1333,6 +1346,8 @@ migrate it back when done. This incantation should do so:
 
 This should cause no user-visible disruption.
 
+See also the above note about canceling reboots.
+
 ### Instance-only restarts
 
 An alternative procedure should be used if only the `ganeti.service`