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Update upgrade.md

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Anne Henmi 2018-11-05 16:45:08 -07:00 committed by GitHub
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@ -205,6 +205,9 @@ restriction only applies to managers and not worker nodes.
### Drain the node
If you are running live application on the cluster while upgrading, remove applications from nodes being upgrades
as to not create unplanned outages.
Start by draining the node so that services get scheduled in another node and
continue running without downtime.