Create Kubernetes cluster with kubeadm on DigitalOcean and cloud-provider

Prerequisites

• Terraform > 0.13
• Bash
• SSH

How to setup

Create an API token on Digital Ocean

export DIGITALOCEAN_TOKEN=your_token
export SPACES_ACCESS_KEY_ID=your_spaces_access_id
export SPACES_SECRET_ACCESS_KEY=your_spaces_access_key

Set your shell script to Digital Ocean Spaces(object storage) and modify data module in main.tf.

Create SSH private key and register it on your Digital Ocean environment. By default the key name is WSL2, but you can change it.

Create droplets

terraform apply

You will get the following output:

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

infra = SSH information:
ssh root@188.166.241.91 # master-0
ssh root@68.183.234.19 # worker-0
ssh root@68.183.236.163 # worker-1
ssh root@68.183.226.145 # worker-2

master internal IP: 10.130.0.3

Replace token in bootstrap_master.sh

sed -i -e "s/abc123abc123abc123/$DIGITALOCEAN_TOKEN/g" bootstrap_master.sh

Apply bootstrap_master.sh on master-0

Copy the following output and replace the global IP to the internal IP

kubeadm join 188.166.241.91:6443 --token tmh9sq.u973nvaof6q7mzjh \
    --discovery-token-ca-cert-hash sha256:f04b8f46ed52d2a129e761480a154741ee8f68c8397735e21d93e238952e675b

Apply bootstrap_node.sh on worker-0, worker-1 and worker-2

Run kubeadm join with internal IP

Enjoy! Now you can use LoadBalancer and PVC on your cluster :D