After first setting up a new k3s instance your kubeconfig file will be located in /etc/rancher/k3s/k3s.yaml.
You cans use it from here by setting $KUBECONFIG to that file.
export KUBECONFIG=/etc/rancher/k3s/k3s.yaml
Or you can copy it to ~/.kube/config
cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
If you have installed k3s on a remote server and need the config on your local machine then you will need to modify the server address to reflect the remote server.
scp user@<server-ip>:/etc/rancher/k3s/k3s.yaml ~/.kube/config
Warning
only do this if you don’t already have a ~/.kube/config file, otherwise copy it to a new file and set your $KUBECONFIG env variable to use it.
Now you will need to open that file and change the server address, making sure to keep the port number.
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: ****
server: https://<server-ip>:6443
name: default