a newbie question related to Kubernetes / OpenShift. The physical infrastructure for our OpenShift cluster is spread across two data centres.
When I create pods, how can I guarantee / choose a particular node / data centre where it would be located?
You can add labels(arbitary key value pairs) on the nodes of your kubernetes cluster.
kubectl label nodes node1 datacenter=xyzthen you can either use nodeselector or nodeaffnity in the pod spec to schedule a pod to a node with a specific label.
As an example of using nodeselector
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
env: test
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
nodeSelector:
datacenter: xyzOfficial docs here with more details and examples.