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Update readme to describe about pod evictions.

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Avesh Agarwal
2017-08-28 13:14:40 -04:00
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README.md
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@@ -100,6 +100,21 @@ This parameter can be configured to activate the strategy only when number of un
are above the configured value. This could be helpful in large clusters where a few nodes could go
under utilized frequently or for a short period of time. By default, `numberOfNodes` is set to zero.
## Pod Evictions
When the rescheduler decides to evict pods from a node, it employs following general mechanism:
* Critical pods (with annotations scheduler.alpha.kubernetes.io/critical-pod) are never evicted.
* Pods (static or mirrored pods or stand alone pods) not part of an RC, RS, Deployment or Jobs are
never evicted because these pods won't be recreated.
* Pods associated with DaemonSets are never evicted.
* Pods with local storage are never evicted.
* Best efforts pods are evicted before Burstable and Guaranteed pods.
### Pod disruption Budget (PDB)
Pods subject to Pod Disruption Budget (PDB) are not evicted if rescheduling violates its pod
disruption budget (PDB). The pods are evicted by using eviction subresource to handle PDB.
## Roadmap
This roadmap is not in any particular order.