k3s

Multi master with k3s

Source

Start the first master

curl -sfL https://get.k3s.io | sh -s - --no-deploy=traefik  --cluster-init

check the node (you should have one)

kubectl get nodes

Get the token

cat /var/lib/rancher/k3s/server/node-token

Start another master

curl -sfL https://get.k3s.io | sh -s - --no-deploy=traefik --server https://IP:6443 --token "TOKEN"

Enjoy :heart:

Archived

Cool links:

• https://medium.com/@rboulanouar/5fe6c3497a1e1
• https://ahmermansoor.blogspot.com/2019/05/install-lightweight-kubernetes-k3s-with-k3os.html
• https://github.com/rancher/k3os/blob/master/README.md

Questions ? (for me)

• Package manager ? (apt equivalent)

Installation

• Download executable (https://k3os.io/ not https://k3s.io/ if you want k3s as your OS)
• Boot
• Change rancher password : sudo passwd rancher
• Connect with ssh

Setup

• Install OS: sudo os-config
• Special part (Config system with cloud-init file?)
• Install as server
• token or cluster secret will be require when you want to add a new node to your cluster
• One you have installed k3s, you should rechange the password ! (First time you changed it to the OS loaded in ram)
• Try kubectl get nodes. Finish !

Add ssh key

Here https://github.com/rancher/k3os/blob/master/README.md#configuration-reference there is an example of /var/lib/rancher/k3os/config.yaml which is a file readed at the boot of k3s. It allows you to specify public keys.