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Improve daemonset doc for more taints tolerated

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This commit is contained in:
Qiming Teng
2017-08-18 10:47:22 +08:00
committed by Andrew Chen
parent 71715a8ce2
commit 93409bb6c0
1 changed files with 14 additions and 3 deletions
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docs/concepts/workloads/controllers/daemonset.md
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@@ -98,9 +98,20 @@ when the pod is created, so it is ignored by the scheduler). Therefore:
- DaemonSet controller can make pods even when the scheduler has not been started, which can help cluster - DaemonSet controller can make pods even when the scheduler has not been started, which can help cluster
bootstrap. bootstrap.
Daemon pods do respect [taints and tolerations](/docs/concepts/configuration/assign-pod-node/#taints-and-tolerations-beta-feature), but they are Daemon pods do respect [taints and tolerations](/docs/concepts/configuration/assign-pod-node/#taints-and-tolerations-beta-feature),
created with `NoExecute` tolerations for the `node.alpha.kubernetes.io/notReady` and `node.alpha.kubernetes.io/unreachable` but they are created with `NoExecute` tolerations for the following taints with no `tolerationSeconds`:
taints with no `tolerationSeconds`. This ensures that when the `TaintBasedEvictions` alpha feature is enabled,
- `node.alpha.kubernetes.io/notReady`
- `node.alpha.kubernetes.io/unreachable`
- `node.alpha.kubernetes.io/memoryPressure`
- `node.alpha.kubernetes.io/diskPressure`
When the support to critical pods is enabled and the pods in a DaemonSet are
labelled as critical, the Daemon pods are created with an additional
`NoExecute` toleration for the `node.alpha.kubernetes.io/outOfDisk` taint with
no `tolerationSeconds`.
This ensures that when the `TaintBasedEvictions` alpha feature is enabled,
they will not be evicted when there are node problems such as a network partition. (When the they will not be evicted when there are node problems such as a network partition. (When the
`TaintBasedEvictions` feature is not enabled, they are also not evicted in these scenarios, but `TaintBasedEvictions` feature is not enabled, they are also not evicted in these scenarios, but
due to hard-coded behavior of the NodeController rather than due to tolerations). due to hard-coded behavior of the NodeController rather than due to tolerations).