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update node-selection/index.md

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Kevin
2017-03-05 10:36:42 +08:00
committed by Andrew Chen
parent 855cc67c77
commit 0f528eec9a
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docs/user-guide/node-selection/index.md
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@@ -77,7 +77,7 @@ with a standard set of labels. As of Kubernetes v1.4 these labels are
* `beta.kubernetes.io/os`
* `beta.kubernetes.io/arch`
## Beta features: affinity and anti-affinity
## Affinity and anti-affinity
`nodeSelector` provides a very simple way to constrain pods to nodes with particular labels. The affinity/anti-affinity
feature, currently in beta, greatly expands the types of constraints you can express. The key enhancements are
@@ -98,7 +98,7 @@ everything that `nodeSelector` can express.
### Node affinity (beta feature)
Node affinity was introduced in Kubernetes 1.2.
Node affinity was introduced as alpha in Kubernetes 1.2.
Node affinity is conceptually similar to `nodeSelector` -- it allows you to constrain which nodes your
pod is eligible to schedule on, based on labels on the node.
@@ -116,7 +116,7 @@ Thus an example of `requiredDuringSchedulingIgnoredDuringExecution` would be "on
and an example `preferredDuringSchedulingIgnoredDuringExecution` would be "try to run this set of pods in availability
zone XYZ, but if it's not possible, then allow some to run elsewhere".
Node affinity is specified as field `nodeAffinity` of `affinity` in the PodSpec.
Node affinity is specified as field `nodeAffinity` of field `affinity` in the PodSpec.
Here's an example of a pod that uses node affinity:
@@ -157,8 +157,8 @@ in the same zone, since they communicate a lot with each other"
and an example `preferredDuringSchedulingIgnoredDuringExecution` anti-affinity would be "spread the pods from this service across zones"
(a hard requirement wouldn't make sense, since you probably have more pods than zones).
Inter-pod affinity is specified as field `podAffinity` of `affinity` in the PodSpec.
And inter-pod anti-affinity is specified as field `podAntiAffinity` of `affinity`.
Inter-pod affinity is specified as field `podAffinity` of field `affinity` in the PodSpec.
And inter-pod anti-affinity is specified as field `podAntiAffinity` of field `affinity` in the PodSpec.
Here's an example of a pod that uses pod affinity: