Node Allocation on kubernetes nodes-CodePudding

I am managing a Kubernetes cluster with 10 nodes(On-prem) and the node's configuration is not identical, 5 nodes are of 64 cores and 125G ram, and 5 nodes are of 64 cores and 256G ram. Most of the time I keep getting alerts saying the node CPU/MEMORY is high and I see the pods are getting restarted, as it is consuming 92-95% of CPU and memory on certain nodes, I want to apply CPU and Memory Allocation on nodes so that the CPU utilization doesn't go very high.

I tried manually editing the node configuration but that did not work.

Any leads for this will be helpful!

CodePudding user response：

In K8s, you can limit the resources usage for the pod containers and reserve a some cpus/memory for the container to avoid this problem:

---
apiVersion: v1
kind: Pod
metadata:
  name: <pod name>
spec:
  containers:
  - name: c1
    image: ...
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"
  - name: c2
    image: ...
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

CodePudding user response：

Found the Kubernetes document for setting the node level allocatable resource.

Fixed using the below document https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/#node-allocatable https://kubernetes.io/docs/concepts/scheduling-eviction/node-pressure-eviction/