Here is a basic setup to deploy a Kubernetes cluster (one master + 2 nodes or 2 minions) using Terraform on OVH public cloud (Openstack based platform). Terraform is a great tool for deploying cloud instances on multiple cloud providers (AWS, Digital Ocean, Google Cloud, OpenStack ...), checkout Hashicorp website for more details about the use cases you can achieve with it. Note : This is NOT a production ready setup, check Kubeadm alpha restriction and concerns
Terraform
Install Terraform on your laptop or build server following instructions given by Hashicorp here
OVH
In order to use OVH Openstack APIs you will need to create specific user credentials in the OVH manager console. (Go to your cloud project, openstack menu, create a user)
SSH KeyPairs
Terraform will need a reference to a key pair on its hosts, so it can connect to the various instances in a secure way and without having to ask you for server passwords everytime. If you don't know how to create a key pair, follow this link.
1. Specify your own credentials
Specify your credentials , edit provider.tf file with your personal credentials, aka "username" and "password"
Edit ressources.tf with your keypair "name", "public_key" and the path to your "private_key" to deploy Kubernetes packages through remote-exec connection process.
2. Create your infrastructure
Use the following command to start building your infrastructure,
terraform apply
Terraform will first, Connect to the OVH provider using the credentials you provided in 1. , Export your SSH keypair to an Openstack object, Create an Ubuntu instance for Kubernetes master, Download associated repo packages, Initialize Kube master Get back the join token in a local file Create 2 Ubuntu instances for Kubernetes nodes or minions, Download associated repo packages, Connect the 2 nodes to master using the token provided by the master instance Return public ips of master and nodes DONE
3. Destroy your infrastructure
You can destroy all the objects created in 2. using the following command :
terraform destroy
And redo it as much as you want !