K8s_TroubleShooting.md

Cluster Troublshooting

Check kubelet status

systemctl status kubelet

● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: active (running) since Mon 2021-10-18 12:59:00 UTC; 37min ago
Docs: https://kubernetes.io/docs/home/
Main PID: 785 (kubelet)
Tasks: 12 (limit: 1105)
CGroup: /system.slice/kubelet.service
└─785 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.

Oct 18 13:36:20 master kubelet[785]: E1018 13:36:20.943484 785 kubelet.go:2407] "Error getting node" err="node "master" not found
Oct 18 13:36:21 master kubelet[785]: E1018 13:36:21.044195 785 kubelet.go:2407] "Error getting node" err="node "master" not found

Verify the status and for the errors.
Here error is master not found, either master is not running or not reachable.

Check docker status

systemctl status docker

● docke.sevice - Docke Application Containe Engine
Loaded: loaded (/lib/systemd/system/docke.sevice; enabled; vendo peset: enabled)
Active: active (unning) since Mon 2021-10-18 12:59:11 UTC; 53min ago
Docs: https://docs.docke.com
Main PID: 1068 (docked)
Tasks: 32
CGoup: /system.slice/docke.sevice
└─1068 /us/bin/docked -H fd:// --contained=/un/contained/contained.sock

Oct 18 13:28:43 maste docked[1068]: time="2021-10-18T13:28:43.627017991Z" level=info msg="ignoing event" containe=aac9cb7cd155ea9
Oct 18 13:30:42 maste docked[1068]: time="2021-10-18T13:30:42.242135699Z" level=info msg="ignoing event" containe=2e961652eab5c1c

Check APIserver ip / Kube-master ip

check in file $HOME/.kube/config on master node

server: https://192.168.0.104:6443
This should be your master node IP.