Kubernetes cluster setup automation

This is part of the Hobby Kube project. Functionality of the modules is described in the guide.

Deploy a secure Kubernetes cluster on Hetzner Cloud, Scaleway or DigitalOcean using Terraform.

Setup

Requirements

The following packages are required to be installed locally:

brew install terraform kubectl jq wireguard-tools

Modules are using ssh-agent for remote operations. Add your SSH key with ssh-add -K if Terraform repeatedly fails to connect to remote hosts.

Configuration

Important: Modify only main.tf in project root, comment or uncomment sections as needed. All variables in variables.tf can be set either directly or from environment variable.

Export the following environment variables depending on the modules you're using:

Set number of hosts (nodes)

export TF_VAR_node_count=3

Using Hetzner Cloud as provider

export TF_VAR_hcloud_token=<token>
export TF_VAR_hcloud_ssh_keys=<keys>
# e.g.
# export TF_VAR_hcloud_ssh_keys='["My Desktop", "My Laptop"]'
# These are the names you give your key after uploading it to the provider.

Using Scaleway as provider

export TF_VAR_scaleway_organization=<access_key>
export TF_VAR_scaleway_token=<token>

Using DigitalOcean as provider

export TF_VAR_digitalocean_token=<token>
export TF_VAR_digitalocean_ssh_keys=<keys>
# e.g.
# export TF_VAR_digitalocean_ssh_keys='["1234567", "2468013"]'

You can get your SSH keys' ID using the API.

Using Cloudflare for DNS entries

export TF_VAR_domain=<domain> # e.g. example.org
export TF_VAR_cloudflare_email=<email>
export TF_VAR_cloudflare_token=<token>

Using Amazon Route 53 for DNS entries

export TF_VAR_domain=<domain> # e.g. example.org shall be already added to hosted zones.
export TF_VAR_aws_access_key=<ACCESS_KEY>
export TF_VAR_aws_secret_key=<SECRET_KEY>
export TF_VAR_aws_region=<region> # e.g. eu-west-1

Install additional APT packages

Each provider takes an optional variable to install further packages during provisioning:

module "provider" {
  # ...
  apt_packages = ["ceph-common", "nfs-common"]
}

Execute

From the root of this project...

# fetch the required modules
$ terraform init

# see what `terraform apply` will do
$ terraform plan

# execute it
$ terraform apply

Using modules independently

Modules in this repository can be used independently:

module "kubernetes" {
  source = "github.com/hobby-kube/provisioning/service/kubernetes"
}

After adding this to your plan, run terraform get to fetch the module.

etcet / provisioning