Bootstrap a kubeadm Kubernetes Cluster on Scaleway!

This repository contains terraform scripts to bootstrap a Kubernetes Cluster on Scaleway with as little configuration as possible. All you're going to need:

• Scaleway Account
• Domain connected to Cloudflare

With Scaleway, you'll be able to get a (3-Node) Kubernetes Cluster running for less than 10€ a month, which is the cheapest I've seen from any cloud provider.

Features

These script will allow you to:

• Bootstrap a working Kubernetes Cluster using Kubeadm
• Create DNS entries on Cloudflare for your masters and nodes (useful for development)
• Once Bootstrapped, you'll have the ability to scale the amount of Cluster Nodes dynamically.

Opinions

The Cluster we'll create with this config is a bit opinionated:

Software we'll use:

• Ubuntu Xenial as the OS, because of its excellent Kubernetes support
• Flannel for Pod Networking, though you can disable the installation of this and install your own

About the Cluster we'll create: (not yet implemented, coming soon)

• The Master Node will also be the Cluster Ingress (handle incoming traffic)
• These kube-system services will be installed:
  • Kubernetes Dashboard for easy monitoring
  • nginx-ingress-controller for handling incoming traffic
  • kube-lego for provisioning Letsencrypt certificates dynamically

Of course, you can just skip the cluster creation step by setting install_kubernetes_services to false in terraform.tfvars for full control. If you do that, you'll basically be at step 3 of the official kubeadm tutorial, except the joining your nodes part, which has already been done for you. Once you installed the Pod Network of your choice, your cluster will be ready

Caveats

This is in heavy development, the following things are to consider for now before using this:

• Kubernetes Nodes get public ip addresses and DNS Entries, this is a security concern and will be optional in the future. Only use this Cluster for development until then.
• only x86_64 Machines are supported currently, I'll begin working on ARM support soon
• No storage solution yet

Setup

These are the required Variables you'll have to change in terraform.tfvars:

# Your Scaleway Access Key
scaleway_organization = "<access key here>"

# A Scaleway token associated with your account
scaleway_token = "<some token here>"

# Set this to the location of the SSH Key that is associated
# with your Scaleway account.
ssh_key = "/path/to/id_rsa"

# Fill in your Cloudflare Auth Information here
cloudflare_token = "<your cloudflare token>"
cloudflare_email = "<your cloudflare email>"
domain = "<your cloudflare managed domain>"

After you've changed these settings, generate a Token which kubeadm will use to authenticate nodes to the cluster:

$ ./scripts/generate-kubeadm-token.sh

Then, do terraform plan and terraform apply and hope for the best :D