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Merge pull request #2383 from Huang-Wei/revise-schedule-DS-pod-by-scheduler 

fix a mis-placed section in schedule-DS-pod-by-scheduler.md
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k8s-ci-robot 2018-07-22 23:41:17 -07:00 committed by GitHub
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contributors/design-proposals/scheduling/schedule-DS-pod-by-scheduler.md
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@ -45,11 +45,6 @@ This option is to leverage NodeAffinity feature to avoid introducing scheduler
1. DS controller filter nodes by nodeSelector, but does NOT check against scheduler’s predicates (e.g. PodFitHostResources) 1. DS controller filter nodes by nodeSelector, but does NOT check against scheduler’s predicates (e.g. PodFitHostResources)
2. For each node, DS controller creates a Pod for it with the following NodeAffinity 2. For each node, DS controller creates a Pod for it with the following NodeAffinity
3. When sync Pods, DS controller will map nodes and pods by this NodeAffinity to check whether Pods are started for nodes
4. In scheduler, DaemonSet Pods will stay pending if scheduling predicates fail. To avoid this, an appropriate priority must
be set to all critical DaemonSet Pods. Scheduler will preempt other pods to ensure critical pods were scheduled even when
the cluster is under resource pressure.
```yaml ```yaml
nodeAffinity: nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution: requiredDuringSchedulingIgnoredDuringExecution:
@ -60,6 +55,10 @@ nodeAffinity:
values: values:
- dest_hostname - dest_hostname
``` ```
3. When sync Pods, DS controller will map nodes and pods by this NodeAffinity to check whether Pods are started for nodes
4. In scheduler, DaemonSet Pods will stay pending if scheduling predicates fail. To avoid this, an appropriate priority must
be set to all critical DaemonSet Pods. Scheduler will preempt other pods to ensure critical pods were scheduled even when
the cluster is under resource pressure.
## Reference ## Reference