update index.md (#2788)

add "on a node" in the sentence to make the expression clear.
This commit is contained in:
Xiaoyu Zhang
2017-03-22 10:00:19 +08:00
committed by Andrew Chen
parent 809473a677
commit eddd78c28d
+1 -1
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@@ -10,7 +10,7 @@ run on particular nodes. There are several ways to do this, and they all use
[label selectors](/docs/user-guide/labels/) to make the selection.
Generally such constraints are unnecessary, as the scheduler will automatically do a reasonable placement
(e.g. spread your pods across nodes, not place the pod on a node with insufficient free resources, etc.)
but there are some circumstances where you may want more control where a pod lands, e.g. to ensure
but there are some circumstances where you may want more control on a node where a pod lands, e.g. to ensure
that a pod ends up on a machine with an SSD attached to it, or to co-locate pods from two different
services that communicate a lot into the same availability zone.