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Merge pull request #9859 from johngmyers/surge-doc 

Improve description of detaching instances
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Kubernetes Prow Robot 2020-09-01 22:25:06 -07:00 committed by GitHub
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docs/operations/rolling-update.md
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@ -113,7 +113,9 @@ update. Instead of first draining and terminating an instance and then creating
it effectively first creates a new instance and then drains and terminates the old one.
Surging is implemented by "detaching" instances, making them not count toward the desired
number of instances in the instance group. The detached instances are updated last;
number of instances in the instance group. This causes the cloud provider to create new
instances in order to satisfy the group's desired number.
The detached instances are drained and terminated last;
when they are terminated the cloud provider does not replace them.
The `maxSurge` is the maximum number of extra instances that can be created during the update.