With these startup scripts you can have a single node kubernetes cluster on Vultr cloud (probably works on other infra as well).
- Create a Vultr account (This link gives you $100 https://www.vultr.com/?ref=8668618-6G)
- Create an ssh key: https://my.vultr.com/settings/#settingssshkeys
- Create a Startup Script: https://my.vultr.com/startup/manage/?SCRIPTID=new and copy the contents of vultr-k8s-singlenode.sh to it. This will install a single node k8s cluster using kubeadm.
- Deploy a new server with the following parameters:
- Type: Cloud Compute (or High Frequency for a faster one)
- Location: Something close to your location
- Server Type: Ubuntu 20.04 x64
- Server Size: At least 2CPU
- Startup Script: select the one you created at step #3
- SSH Keys: select the one you created at #2
It takes a few minutes to create the server. At once it's ready, connect to it using SSH.
K8s deployment can be tracked in /tmp/firstboot.log file. At once it's finished, your cluster is ready to run commands like:
root@k8s:~# kubectl run --image nginx mynginx
pod/mynginx created
root@k8s:~# kubectl expose pod mynginx --type=NodePort --port=80
service/mynginx exposed
root@k8s:~# kubectl get all
NAME READY STATUS RESTARTS AGE
pod/mynginx 1/1 Running 0 7s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17m
service/mynginx NodePort 10.104.148.34 <none> 80:31454/TCP 2s
root@k8s:~# curl localhost:31454
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
This script is pretty similar to the previous one. It deploys Microk8s based on https://microk8s.io/docs, so k8s will be accessible with microk8s kubectl ... commands.
Installation steps are the same as with kubeadm, but use vultr-microk8s.sh as a startup script.
https://k8s.io - Trust me, it's good stuff ;)