K8s_Known_Errors.md

Installation errors

on Ubuntu

1. Check kubelet status
   systemctl status kubelet
2. Check docker status
   systemctl status docker
3. Reset a k8s master/worker node
   sudo kubeadm reset

Error: kubernetes - Couldn't able to join master node - error execution phase preflight: couldn't validate the identity of the API Server

Res: On a standalone ubuntu vm , disable the firewall and check

ufw status
sudo ufw disable

On an aws ec2
Expose port:6443 in Security Group