Civo Kubernetes Deployment with Terraform

Overview

This repository contains Terraform modules for deploying and managing a Kubernetes cluster on Civo Cloud, along with optional cloud-native tooling such as Rancher, Argo Suite, Sonatype Nexus, and more. The repository is structured with various sub-modules, each serving a distinct purpose.

Directory Structure

• ./common/civo-cloud-native/: The primary Terraform module that orchestrates the Kubernetes cluster creation, firewall configuration, VPC setup, and optional tool installations. For detailed configuration options, refer to its README.

• ./modules/: Holds smaller, more focused Terraform modules that the primary module calls. These manage the deployments of individual components like databases, ingress controllers, etc.

• ./artifacts/input_files/: This directory is for placing any special files required by modules, such as a .lic file for software licenses.

• ./artifacts/output_files/: Post-deployment, this directory will contain key outputs like Rancher's URL, kubeconfig, and any randomly generated passwords.

Requirements

• Terraform v1.x
• Civo API Token
• kubectl installed (if interacting with Kubernetes)

Configuration

Using terraform.tfvars.example

An example terraform.tfvars.example file is provided in the main directory for your reference. This file includes example configurations for required variables:

// Civo resources
civo_region = "LON1" //required
civo_token  = ""     //required

// For Cert Manager SSL Certificates via LetsEncrypt
# must be a valid email address
email = "[email protected]" //required

Copy this file to terraform.tfvars and fill in your specific values before running terraform apply.

Special Input Files

If any module requires special files like a .lic license file, place these in the ./artifacts/input_files/ directory.

Outputs

Upon successful Terraform apply, key outputs such as the Rancher URL, kubeconfig, and any randomly generated passwords will be stored in ./artifacts/output_files/.

Quick Start

1. Clone the Repository

   git clone https://github.com/krumIO/krum-appdev-platform-starter.git

2. Navigate to Main Directory

   cd krum-appdev-platform-starter

3. Initialize Terraform

   terraform init

4. Plan Configuration

   terraform plan -out="plan.out"

5. Apply Configuration

   terraform apply "plan.out"

Documentation

For more details, please consult the README files within each sub-directory:

• Civo Cloud Native Module
• Individual Component Modules

Advanced Usage: Merging kubeconfig Files

About the Script

The included bash script, let's call it merge-kubeconfig.sh, allows you to merge the kubeconfig file generated by the Kubernetes cluster deployment into your existing kubeconfig file located at ${HOME}/.kube/config.

This is particularly useful when:

• You are managing multiple Kubernetes clusters and would like a single point of configuration for kubectl.
• You are switching between different clusters often and need a quick way to update your kubeconfig.

What Does The Script Do?

Here's a step-by-step explanation of what the script does:

1. Prompt for Confirmation: The script starts by explaining what it is about to do and asks for your confirmation to proceed.

2. Check User Confirmation: If you do not confirm with "yes," the script will abort.

3. Check Source File: The script checks if the source kubeconfig file, usually located in ./artifacts/output_files/kubeconfig.yaml, exists. If not, it aborts.

4. Check Destination File: It checks if a kubeconfig file already exists in your home directory under ~/.kube/config.

   • If Not: It simply copies the source kubeconfig to this location.

   • If Yes: It performs the following steps:

     a. Backup Existing kubeconfig: It backs up your existing kubeconfig file, appending a timestamp to the backup filename.

     b. Merge Configurations: It uses kubectl to merge the source and destination kubeconfig files.

     c. Replace Old Config: It then replaces the existing kubeconfig file with the newly merged one.

5. Completion Message: Finally, a message is displayed indicating that the kubeconfig files have been merged.

How to Use The Script

1. Make the script executable:

   chmod +x merge-kubeconfig.sh

2. Run the script:

   ./merge-kubeconfig.sh

Please proceed with caution and ensure you understand the implications of running this script, as it will modify your existing kubeconfig file.

Contributing

Contributions to improve or extend this project are welcome. Please open an issue or submit a pull request for any contributions.