Error while joining cluster with node

Question

Hi Getting below error

Followed below url

https://www.edureka.co/blog/install-kubernetes-on-ubuntu#NodesJoiningKubeCluster

kube-master@kmaster:~$ sudo kubeadm join 172.30.250.79:6443 --token kakyg6.pgmm8emntyokc2pr --discovery-token-ca-cert-hash sha256:73dc55339c3210f611886daf9de92632e66d861799f4cb113c42b5782cf8a5a9
[preflight] Running pre-flight checks
[preflight] Some fatal errors occurred:
        [ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty
        [ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
        [ERROR Port-10250]: Port 10250 is in use
        [ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

Hey @Vishal, check if all your pods are running before trying to join the nodes. — Kalgi, Jan 11, 2019
sudo kubeadm join 172.30.250.79:6443 --token kakyg6.pgmm8emntyokc2pr --discovery-token-ca-cert-hash sha256:73dc55339c3210f611886daf9de92632e66d861799f4cb113c42b5782cf8a5a9

[sudo] password for kube-node:

[preflight] Running pre-flight checks

[preflight] Some fatal errors occurred:

[ERROR FileAvailable--etc-kubernetes-bootstrap-kubelet.conf]: /etc/kubernetes/bootstrap-kubelet.conf already exists

[ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists

[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...` — Jan 15, 2019
Hey, seems like your token has expired, why don't you try creating another token for master?

[discovery] Failed to connect to API Server "172.30.250.79:6443": token id "kakyg6" is invalid for this cluster or it has expired. Use "kubeadm token create" on the master node to creating a new valid token — Kalgi, Jan 16, 2019
Also, you're getting the following error because you've already executed the join command on your nodes. Its created your /etc/kubernetes/pki/ca.crt file even though your node failed to join.

To get rid of this error, execute the following reset command on your node and execute then join command again. This will reset your cluster environment and then when you try joining the node again to the cluster, it will create all the files again.

kubeadm reset — Kalgi, Jan 16, 2019

Kalgi · Answer 1 · Jan 16, 2019

Hi Any update?

answered Jan 16, 2019 by anonymous

Hey, I've replied to your comment.

https://www.edureka.co/community/35422/error-while-joining-cluster-with-node%26show%3D35753?show=35753#c35753

Please have a look and let me know of your cluster's further situation.

commented Jan 16, 2019 by Kalgi
• 52,340 points

score 0 · Answer 2 · Jan 16, 2019

To create a new token for master, use the command

kubeadm token create

Creating a new token for master is explained in this thread

https://www.edureka.co/community/35767/node-unable-to-join-cluster-saying-token-expired

answered Jan 16, 2019 by Layla

Kalgi · Answer 3 · Jan 17, 2019

Hi Kalgi after following above steps it works but unfortunately, it is giving me below error.

The connection to the server 172.30.250.79:6443 was refused - did you specify the right host or port?

And noticed that while running kubectl get pods -o wide --all-namespaces

kube-system   coredns-86c58d9df4-69zlx                   0/1     Evicted   0          5d23h   <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-bt6lr                   0/1     Error     69         44h     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-f2wgx                   0/1     Evicted   0          45h     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-hr6lk                   0/1     Evicted   0          35m     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-jhrlt                   0/1     Evicted   0          47h     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-mgt8q                   0/1     Evicted   0          45h     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-qxgs6                   0/1     Evicted   0          6d20h   <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-r2lg7                   0/1     Evicted   0          44h     <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-s7kfr                   0/1     Evicted   0          6d20h   <none>          kmaster   <none>           <none>

kube-system   coredns-86c58d9df4-tr9cj                   0/1     Evicted   0          47h     <none>          kmaster   <none>           <none>

kube-system   coredns--XXXXX are in evicted state.

Hey you're getting the error

The connection to the server 172.30.250.79:6443 was refused - did you specify the right host or port?

because there is network issue between the hosts but that's bound to happen as your pods aren't ready yet.

Delete all evicted pods as they are unnecessary and check the pod status again. Use the following command for deleting the evicted pods.

kubectl get pods --all-namespaces | grep Evicted | awk '{print $2 " --namespace=" $1}' | xargs kubectl delete pod — Kalgi, Jan 17, 2019
Also could you please register so it's easy for us and to other readers having similar issue to understand the flow of this discussion. — Kalgi, Jan 17, 2019