The connection to the server x.x.x.x:6443 was refused. Did you specify the right host or port?

Question

I am installing kubeadm in aws ec2instances in ubuntu. I opened the security group for all traffic externally and internal to that security group also. But i am facing this problem continously and not able to move forward.Please refer to this url [https://i.stack.imgur.com/ziDYx.png] to see the error exactly.

I tried flanel and calico networks but both giving same error. Can someone tell me where i am doing wrong?

Answer 1

I was facing the same problem.

I had 3 EC2 servers and bootstrapped the cluster via kubeadm .

My solution was to use Ubuntu 20.04 (Focal Fossa) as a base image for my EC2 instances. (NOT the latest one!)

I hope that helps you.

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This error (kubectl can not connect to the API server) usually happens because of two main reasons:

1. misleading kubeconfig
2. Certificates

I suggest trying the below commands, and hopefully, you are good to go.

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First of all, try to update your kubeconfig:

kubectl config view --raw > ~/.kube/config

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If your problem doesn't solve with the first command, then probably you should renew/update your cluster certificates:

Here are some examples:

• Microk8s

sudo microk8s.refresh-certs --cert ca.crt

• kubeadm

kubeadm certs renew <command>

• So on and so forth...