RKE cluster on multipass instances

This script will create a configurable amount of instances using multipass, create or use specified SSH keys, install a configurable version of Docker on it, create the RKE configuration file (cluster.yml) and run RKE (rke up) to create the Kubernetes cluster.

Requirements

• multipass (See multipass: Getting it)
• RKE (See rke: latest release)
• Docker (to run jq in a container) or jq locally

Running it

Clone this repo, and run the script:

bash multipass-rke.sh

This will (defaults):

• Generate random name for your cluster (configurable using NAME)
• Generate SSH key for RKE to access the nodes (configurable using SSH_PRIVKEYFILE, SSH_PUBKEYFILE and SSH_PASSPHRASE)
• Create cloud-init to add SSH public key to the machines and install Docker (19.03 by default, configurable using DOCKER_VERSION)
• Create one machine (configurable using COUNT_MACHINE) with 2 CPU (CPU_MACHINE), 10G disk (DISK_MACHINE) and 4000M of memory (MEMORY_MACHINE) using Ubuntu focal (IMAGE)
• Create cluster.yml file for RKE
• Run rke up to create the cluster

Quickstart Ubuntu 20.04 droplet

sudo snap install multipass
wget -O /usr/local/bin/rke https://github.com/$(wget https://github.com/rancher/rke/releases/latest -O - | egrep '/.*/.*/rke_linux-amd64' -o)
chmod +x /usr/local/bin/rke
wget https://raw.githubusercontent.com/superseb/multipass-rke/master/multipass-rke.sh
bash multipass-rke.sh
curl -Lo /usr/local/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
chmod +x /usr/local/bin/kubectl
kubectl --kubeconfig kube_config_* get nodes

Clean up

The files that are created are:

• $NAME-cloud-init.yaml
• $NAME-cluster.yml
• $NAME-id_rsa (if SSH_PRIVKEYFILE is empty)
• $NAME-id_rsa.pub (if SSH_PRIVKEYFILE is empty)

You can clean up the instances by running multipass delete rke-$NAME-{1,2,3} --purge or (WARNING this deletes and purges all instances): multipass delete --all --purge