148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

Chapter 9 ■ Scheduling Pods on Nodes
As discussed earlier, NodeAffinity is a priority function; and priority functions have weight allocated
to them in ranking nodes. Create a pod definition file podNodeAffinity.yaml and allocate a weight of 75
for a pod using node affinity preferredDuringSchedulingIgnoredDuringExecution. Set the expressions to
match to the label key kubernetes.io/image-name to be either nginx or hello-world.
apiVersion: v1
kind: Pod
metadata:
name: with-labels
annotations:
scheduler.alpha.kubernetes.io/affinity: >
{
"nodeAffinity": {
"preferredDuringSchedulingIgnoredDuringExecution": [
{
"weight": 75,
"preference":
{
"matchExpressions": [
{
"key": "kubernetes.io/image-name",
"operator": "In",
"values": ["nginx", "hello-world"]
}
]
}
}
]
}
}
kubernetes.io/image-name: hello-world
spec:
containers:
- name: with-labels
image: nginx
The pod definition file podNodeAffinity.yaml is shown in a vi editor in Figure 9-53.
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