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Resolving Kubernetes Pod Scheduling Issues: Addressing “1 node(s) had taints that the pod didn’t tolerate” Error

Have you ever run into the Kubernetes error “1 node(s) had taints that the pod could not tolerate”? This usually happens because, by default, pods don’t schedule on the master node in Kubernetes. While running pods on worker nodes is best practice, there may be times when you need to deploy pods on a single-node master cluster, particularly in Kubernetes on AWS.

Error:

Error: "1 node(s) had taints that the pod didn't tolerate"

If your pod becomes stuck in a pending state during deployment and fails to run, the problem could be related to scheduling. This problem arises when your pod can’t schedule on a worker node. Various factors can contribute to this, such as nodes not being ready, pods not being ready, or insufficient resources, all of which are related to the Kubernetes concept of “taints.”

Solution:

Removing Taints to Allow Pod Scheduling on Master Node, You can remove the taint to resolve this issue and allow your pod to be scheduled directly on the master node rather than a worker node. Here is the command to accomplish this:

kubectl taint nodes --all node-role.kubernetes.io/master-

This command removes the taint on the master node, allowing pods to be scheduled on it.

While this solution may be appropriate for specific use cases, deploying pods on the master node is generally not considered a best practice in Kubernetes. Ensure that your application architecture aligns with this deviation from the norm.

See also  Explain services types of kuberntes

Stay tuned for more articles on our tech blog about optimizing your Kubernetes deployments. If you have any questions or encounter any difficulties, please contact us, we are here to help!

Learn More about kubernetes : Main Components of Kubernetes Architecture

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