Cloud-Native Microservices With Kubernetes - 2nd Edition

# First of all, choose a directory where you want to store the files we will use.
PROJECT_NAME="CloudNativeMicroservices"

# Create the folder structure
mkdir -p $PROJECT_NAME

# Create subdirectories for Terraform files
mkdir -p $PROJECT_NAME/workspace-terraform
mkdir -p $PROJECT_NAME/kubernetes-terraform

# Create a unique name for the SSH key to avoid conflicts
# with other keys in your ~/.ssh directory
# Make sure you are not overwriting an existing key
SSH_UNIQUE_NAME="$HOME/.ssh/$PROJECT_NAME"

# generate the keys (public and private)
# This will overwrite the keys if they already exist
ssh-keygen -t rsa \
    -b 4096 \
    -C "$PROJECT_NAME" \
    -f $SSH_UNIQUE_NAME -N "" \
    <<< y

# add the key to the ssh-agent
ssh-add $SSH_UNIQUE_NAME

# Export the DigitalOcean token.
# Get one here: https://cloud.digitalocean.com/account/api/tokens
export DIGITALOCEAN_TOKEN="[CHANGE_ME]"

# Choose the best region for you.
# More options here: https://www.digitalocean.com/docs/platform/availability-matrix/
export DIGITALOCEAN_REGION="fra1"

# I recommend using Ubuntu 24.04 for this project.
export DIGITALOCEAN_IMAGE="ubuntu-24-04-x64"

# SSH key variables
export DIGITALOCEAN_SSH_KEY_NAME="$SSH_UNIQUE_NAME"
export DIGITALOCEAN_SSH_PUBLIC_KEY_PATH="$SSH_UNIQUE_NAME.pub"
export DIGITALOCEAN_SSH_PRIVATE_KEY_PATH="$SSH_UNIQUE_NAME"

# VPC variables.
# You can use the default VPC or create a new one.
# Use doctl to get the VPC UUID (`doctl vpcs list | grep $DIGITALOCEAN_REGION`)
# Or by using your web console: https://cloud.digitalocean.com/networking/vpc
export DIGITALOCEAN_VPC_UUID="[CHANGE_ME]"
export DIGITALOCEAN_PROJECT_NAME="$PROJECT_NAME"

# Workload cluster variables
export DIGITALOCEAN_WORKSPACE_VM_NAME="workspace"
export DIGITALOCEAN_WORKSPACE_VM_SIZE="s-2vcpu-4gb"

# Create a Terraform variable file.
cat << EOF > $PROJECT_NAME/workspace-terraform/variables.tf
variable "region" {
  default = "${DIGITALOCEAN_REGION}"
}
variable "image" {
  default = "${DIGITALOCEAN_IMAGE}"
}
variable "vpc_uuid" {
  default = "${DIGITALOCEAN_VPC_UUID}"
}
variable "workspace_vm_size" {
  default = "${DIGITALOCEAN_WORKSPACE_VM_SIZE}"
}
variable "workspace_vm_name" {
  default = "${DIGITALOCEAN_WORKSPACE_VM_NAME}"
}
variable "project_name" {
  default = "${DIGITALOCEAN_PROJECT_NAME}"
}
variable "ssh_key_name" {
  default = "${DIGITALOCEAN_SSH_KEY_NAME}"
}
variable "ssh_public_key_path" {
  default = "${DIGITALOCEAN_SSH_PUBLIC_KEY_PATH}"
}
variable "ssh_private_key_path" {
  default = "${DIGITALOCEAN_SSH_PRIVATE_KEY_PATH}"
}
EOF