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Kubernetes is an open-source platform designed to automate deploying, scaling, and operating application containers. It groups containers that make up an application into logical units for easy management and discovery. Prometheus is an open-source monitoring and alerting toolkit that is often used with Kubernetes to monitor cluster health and performance.
The KubeDaemonSetNotScheduled alert in Prometheus indicates that a daemon set is not scheduled on all nodes. This alert is crucial as it can affect the availability and performance of applications running on your Kubernetes cluster.
A DaemonSet ensures that all (or some) nodes run a copy of a pod. When you see the KubeDaemonSetNotScheduled alert, it means that the DaemonSet controller is unable to schedule a pod on one or more nodes. This can occur due to various reasons such as node taints, insufficient resources, or scheduling constraints.
To resolve the KubeDaemonSetNotScheduled alert, follow these steps:
Ensure that your DaemonSet pods have the necessary tolerations to be scheduled on nodes with taints. You can list node taints using the following command:
kubectl describe nodes | grep -i taints
Verify that your DaemonSet has the appropriate tolerations defined in its manifest.
Check if the nodes have sufficient resources to run the DaemonSet pods. You can use the following command to check node resources:
kubectl describe nodes | grep -i 'capacity\|allocatable'
Ensure that your DaemonSet's resource requests and limits are within the available resources on the nodes.
Check if there are any custom scheduling constraints that might be affecting pod scheduling. Review the DaemonSet's manifest for any node selectors or affinity rules that might be too restrictive.
For more information on managing DaemonSets and troubleshooting scheduling issues, refer to the following resources:
By following these steps, you should be able to resolve the KubeDaemonSetNotScheduled alert and ensure that your DaemonSet is properly scheduled across all nodes.
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(Perfect for DevOps & SREs)