cluster node creation issues

Based on the information provided, it appears you're encountering issues while setting up a Kubernetes cluster using kubeadm. The error message suggests that there's a problem with the installation or configuration of kubeadm, kubectl, and kubelet.

Here are some potential reasons for this issue and steps to resolve it:

1. Version mismatch: You're trying to install specific versions (1.20.0-00) of kubeadm, kubectl, and kubelet. Make sure these versions are compatible with each other and with your Kubernetes cluster version.

2. Repository issues: The error indicates that the packages cannot be located. This could be due to outdated package lists or issues with the Kubernetes repository. Try running apt update again to refresh your package lists.

3. Network connectivity: Ensure that your instance has proper internet connectivity to download the packages.

4. Package availability: The specific versions you're trying to install might not be available in the repository. You could try installing without specifying the version (e.g., apt install kubeadm kubectl kubelet -y) to get the latest available versions.

5. Docker compatibility: Since you mentioned installing Docker, make sure it's a version compatible with the Kubernetes components you're trying to install.

6. Instance resources: Verify that your instance has sufficient resources (CPU, memory, disk space) to install and run these components.

To troubleshoot:

1. Check if the Kubernetes repository is properly added to your sources list.
2. Verify your instance's internet connectivity.
3. Try installing without specifying versions to see if it resolves the issue.
4. Check system logs for any additional error messages that might provide more context.

If the issue persists, you may need to consider using a different AMI or instance type, or explore alternative methods of cluster creation such as using managed Kubernetes services like Amazon EKS.
Sources
EKS Nodes Fail to Create - but why? It worked yesterday? | AWS re:Post
Troubleshoot problems with Amazon EKS clusters and nodes - Amazon EKS