Kubernetes Research

Documentation -> https://kubernetes.io/docs/concepts/workloads/controllers/

Prepare the Raspberry PIs for Kubernetes (K3S) to be installed

Change to root

sudo su -

Run the following commands to prepare the pis for K3S

sudo iptables -F bin/iptables-legacy | sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
reboot

Install K3S (Light version of Kubernetes) in the Master Node.

curl -sfl https://get.k3s.io | K3S_KUBECONFIG_MODE="644" sh -s

Get all the nodes in Kubernetes

kubectl get nodes

Get the token to register the rest of the nodes to the Master Node:

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

Nodes Command to install K3S and register the Worker Nodes to the Master Node

curl -sfL https://get.k3s.io | K3S_TOKEN="[token from previous step]" K3S_URL="https://[MASTER NODE IP]:6443" K3S_NODE_NAME="[NODE NAME]" sh -

Deploy Apps to the Nodes, using a manifest file:

kubectl apply -f [name of the file].yaml

Will show you the pods/containes deployed in your nodes

kubectl get pods

Will show you the pods and in which node they are deployed.

kubectl get pods -o wide

To expose your application to the outside network, you will need to create another manifest file

TODO

View the services that are running and exposed to the network

kubectl get services

Rancher Install

In a separate node with Ubuntu version 18 or greater, do the following:

mkdir /etc/rancher/rke2
touch config.yaml

Add to the config file

token: myrancher
tls-san:
 - 192.168.50.109

Then download Rancher

curl -sfL https://get.rancher.io | sh -