are migrated from node to node) are not supported yet. Hroller by design
should support them both with and without secondary node replacement.
-EXAMPLE
--------
+EXAMPLES
+--------
+
+Online Rolling reboots, using tags
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Selecting by tags and getting output for one step only can be used for
+planing the next maintenance step.
+::
+
+ $ hroller --node-tags needsreboot --one-step-only -L
+ 'First Reboot Group'
+ node1.example.com
+ node3.example.com
+
+Typically these nodes would be drained and migrated.
+::
+
+ $ GROUP=`hroller --node-tags needsreboot --one-step-only --no-headers -L`
+ $ for node in $GROUP; do gnt-node modify -D yes $node; done
+ $ for node in $GROUP; do gnt-node migrate -f --submit $node; done
+
+After maintenance, the tags would be removed and the nodes undrained.
+
-Rolling node reboot output
-~~~~~~~~~~~~~~~~~~~~~~~~~~
+Offline Rolling node reboot output
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-With the default options, the program shows one reboot group per line as
-a comma-separated list.
+If all instances are shut down, usually larger node groups can be found.
::
- $ hroller -L
+ $ hroller --offline-maintainance -L
'Node Reboot Groups'
node1.example.com,node3.example.com,node5.example.com
node8.example.com,node6.example.com,node2.example.com