Selectors help filter these groups for Kubernetes operations. When creating an object, labels are included in a manifest file to give them distinguishing characteristics so they can be identified easily. In Kubernetes, clusters, labels, and selectors offer a standard method of categorizing and filtering objects based on various criteria. Kubectl config view -o jsonpath='' $APISERVER/api/v1/namespaces/default/pods/nginx/binding/ -header 'Authorization: Bearer $TOKEN' -insecure The POST request’s data should be set to the binding object in JSON format: kubectl run nginx -image=nginx The binding object mimics a scheduler, since you specify a node name with the targeted node: apiVersion: v1 For a running pod, nodes can be assigned by creating a binding object then sending a POST request to the pods binding API. This can only be done during pod creation since Kubernetes does not allow the modification of the nodeName property while a pod is already running. In this case, you can schedule a pod by setting the nodeName property in the manifest file. If there are no schedulers in a cluster, pods will be constantly in PENDING state. Once the right node has been identified, the scheduler updates the nodeName tag, creating a binding object.

The scheduler will run an algorithm to determine the most appropriate node based on resource requirements. Pods in which the nodeName property is unassigned are the right candidates for scheduling. The scheduler process inspects all pod configuration files, checking for this property. Kubernetes automatically adds this when assigning the pod to a node. Manual SchedulingĮvery pod has a property called nodeName that is typically unfilled when creating the YAML configuration file. The lectures include a series of fun and challenging practical exercises to build confidence and competence when working with Kubernetes schedulers. This section is a deep-dive into the processes and explores every aspect from manual scheduling to the role of resource requirements in cluster scheduling. Scheduling was introduced in the previous section by creating a scheduler service. The Scheduler process monitors newly created pods and allocates them to nodes based on specific scheduling requirements. In Kubernetes clusters, Schedulers are the control plane elements that ensure pods are assigned to the right nodes where they will run on the Kubelet service. 14 min read Introduction to Scheduling in Kubernetes.

What is kubernetes taint