This small setup can be used to provision Flatcar nodes on DigitalOcean.
Create a terraform.tfvars file that lists your preferences. Like this one:
cluster_name = "mycluster"
machines = ["mynode"]
datacenter = "nyc3"
ssh_keys = ["ssh-rsa AA... me@mail.net"]
flatcar_stable_version = "x.y.z"
You can resolve the latest Flatcar Stable version with this shell command:
(source <(curl -sSfL https://stable.release.flatcar-linux.net/amd64-usr/current/version.txt); echo "${FLATCAR_VERSION_ID}")
The machine name listed in the machines variable is used to retrieve the corresponding Container Linux Config. For each machine in the list, you should have a machine-NAME.yaml.tmpl file with a corresponding name. An example file machine-mynode.yaml.tmpl for mynode is already provided.
Now run Terraform (version 13) as follows:
export DIGITALOCEAN_TOKEN=...
terraform init
terraform apply
When terraform is done running, it will print the IP addresses of the machines created. Log in via ssh core@IPADDRESS (maybe add -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null).
When you make a change to machine-mynode.yaml.tmpl and run terraform apply again, the instance will be replaced. Consider using create_before_destroy in your final setup.