I'm a dragonfly

k3s

kubernetes k8s 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:

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.

ssh_authorized_keys:
- "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC2TBZGjE+J8ag11dzkFT58J3XPONrDVmalCNrKxsfADfyy0eqdZrG8hcAxAR/5zuj90Gin2uBR4Sw6Cn4VHsPZcFpXyQCjK1QDADj+WcuhpXOIOY3AB0LZBly9NI0ll+8lo3QtEaoyRLtrMBhQ6Mooy2M3MTG4JNwU9o3yInuqZWf9PvtW6KxMl+ygg1xZkljhemGZ9k0wSrjqif+8usNbzVlCOVQmZwZA+BZxbdcLNwkg7zWJSXzDIXyqM6iWPGXQDEbWLq3+HR1qKucTCSxjbqoe0FD5xcW7NHIME5XKX84yH92n6yn+rxSsyUfhJWYqJd+i0fKf5UbN6qLrtd/D"

Use host kubectl command

You can use kubectl from your host without ssh connection !

For that, you have to get a config file and copy it on your local machine. (Display and copy it is the fast way 😛)

# On k3s
cat /etc/rancher/k3s/k3s.yaml

# On host
mkdir ~/.kube
vim ~/.kube/config

Do not forget to replace localhost with your k3s server ip. After it, install kubectl on your host machine

# Arch linux
yaourt -S kubectl

# MacOS
brew install kubernetes-cli

kubectl get nodes should work from your host !

Installation of Helm (k8s package manager)

# Arch linux
yaourt -S helm

# MacOS
brew install kubernetes-helm