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Manual Scheduling

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In this section, we will take a look at Manually Scheduling a POD on a node.

How Scheduling Works

• What do you do when you do not have a scheduler in your cluster?
  • Every POD has a field called NodeName that by default is not set. You don’t typically specify this field when you create the manifest file, kubernetes adds it automatically.
  • Once identified it schedules the POD on the node by setting the nodeName property to the name of the node by creating a binding object. ``` apiVersion: v1 kind: Pod metadata: name: nginx labels: name: nginx spec: containers:
    • name: nginx image: nginx ports:
      • containerPort: 8080 nodeName: node02 ```

No Scheduler

• You can manually assign pods to node itself. Well without a scheduler, to schedule pod is to set nodeName property in your pod definition file while creating a pod.

  

• Another way

  apiVersion: v1
  kind: Binding
  metadata:
    name: nginx
  target:
    apiVersion: v1
    kind: Node
    name: node02
  

  ``` apiVersion: v1 kind: Pod metadata: name: nginx labels: name: nginx spec: containers:

  • name: nginx image: nginx ports:
    • containerPort: 8080 ```

K8s Reference Docs:

• https://kubernetes.io/docs/reference/using-api/api-concepts/
• https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#nodename