Pod bias when building Elastic Cloud on Kubernetes (ECK) with LKE
ECK was built on LKE using the procedure shown here.
https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-quickstart.html
Pods are biased when pods are drained or uncordon for maintenance, etc.
I want to distribute pods to 3 Nodes for Data-Node and Master-Node, but I don't know how to configure it.
kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
quickstart-es-data-nodes-0 1/1 Running 0 2d9h 10.2.5.28 lke116066-172974-649c63812a91 <none> <none>
quickstart-es-data-nodes-1 1/1 Running 1 (2d16h ago) 4d9h 10.2.4.2 lke116066-172974-649c6380580d <none> <none>
quickstart-es-data-nodes-2 1/1 Running 0 2d9h 10.2.6.11 lke116066-172974-649c6380c34c <none> <none>
quickstart-es-master-nodes-0 1/1 Running 0 2d16h 10.2.4.6 lke116066-172974-649c6380580d <none> <none>
quickstart-es-master-nodes-1 1/1 Running 0 2d15h 10.2.5.2 lke116066-172974-649c63812a91 <none> <none>
quickstart-es-master-nodes-2 1/1 Running 1 (2d16h ago) 4d9h 10.2.4.3 lke116066-172974-649c6380580d <none> <none>
quickstart-kb-694658999d-46b7m 1/1 Running 0 2d9h 10.2.5.26 lke116066-172974-649c63812a91 <none> <none>
quickstart-kb-694658999d-6722x 1/1 Running 0 2d9h 10.2.5.23 lke116066-172974-649c63812a91 <none> <none>
quickstart-kb-694658999d-89p7g 1/1 Running 1 (2d16h ago) 4d9h 10.2.4.7 lke116066-172974-649c6380580d <none> <none>
➜ eck kubectl get node
NAME STATUS ROLES AGE VERSION
lke116066-172974-649c6380580d Ready <none> 4d9h v1.26.3
lke116066-172974-649c6380c34c Ready <none> 2d16h v1.26.3
lke116066-172974-649c63812a91 Ready <none> 4d9h v1.26.3
1 Reply
tlambert
Linode Staff
I think the feature you're looking to incorporate into your deployment is the ability to assign pods to nodes.
One method of accomplishing this is using the nodeSelector field to match with node labels.
A more fully featured way to assign pods to nodes is using affinity language. You can set your pod's affinity in the .spec.affinity.nodeAffinity field of the pod spec. This guide titled Assign Pods to Nodes using Node Affinity has instructions for making these configuration changes your cluster.