Automated setup of a k3s cluster with 1 master and n compute-nodes.
I only tested this on my local cluster running on 6 ODROID-MC1 Solo. I run them with Armbian buster (Linux 5.4.28-odroidxu4) So use this at your own risk!
$ cd setup
$ # update inventory to your needs
$ ansible-playbook -i inventory.yaml prep.yaml
$ ansible-playbook -i inventory.yaml create_cluster.yamlTo connect to the cluster, copy the kube-config from the k3s-master to your local machine.
# assuming you have passwordless sudo, which you're gonna need for ansible either way
$ ssh user@master "sudo cp /etc/rancher/k3s/k3s.yaml /home/<user>/k3s.yaml && sudo chown <user>:<group> /home/<user>/k3s.yaml"
$ scp <user>@<master>:k3s.yaml .
$ ssh user@master "rm -f /home/<user>/k3s.yaml"Update k3s.yaml by replacing server: https://127.0.0.1:6443 with the actual servername server: https://<mastername or -ip>:6443
Afterwards you should be able to connect to your cluster, using k3s.yaml kube-config.
You can test it with:
$ kubectl --kubeconfig=k3s.yaml get nodesIn deploy you can find a directory called test, which contains a simple deployment for nginx with a service and an ingress. You can deploy it, to see if your cluster is working properly.
$ kubectl apply -f deploy/test/
# Verify the deployment
$ kubectl get all -n test
# You should get an output similar to this:
NAME READY STATUS RESTARTS AGE
pod/nginx-test-6ddd567766-9vdm5 1/1 Running 0 103m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/nginx-test ClusterIP 10.43.25.181 <none> 80/TCP 103m
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/nginx-test 1/1 1 1 103m
NAME DESIRED CURRENT READY AGE
replicaset.apps/nginx-test-6ddd567766 1 1 1 103mIf this worked, update /etc/hosts to make example.com point to the IP of your master.
Now open http://example.com in your Browser and check, if you can see the default NGINX-homepage.
Alternatively you can test from the cli using this command
$ curl example.com 2>/dev/null |grep "Welcome to nginx\!" || echo "Failed"
# Good
<title>Welcome to nginx!</title>
<h1>Welcome to nginx!</h1>
# Bad
FailedNow you're good to go. Have fun with your k3s-cluster!
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