/kvm-tf-gen

Bash script to generate terraform script using kvm/libvirt plugins.

Primary LanguageShellBSD 3-Clause "New" or "Revised" LicenseBSD-3-Clause

Bash Script to generate Terraform and Cloud-Init Automation Script

This repository contains a bash script gen_tf.sh to automate the generation of Terraform configuration files and cloud-init configuration files for provisioning multiple VMs with customized settings using libvirt.

Terraform provider used:

Teraform-Provider-Libvirt

Features

  • Create multiple VMs with customized configurations.
  • Customize VM base name, cloud image path, storage pool, disk size, static IP addresses, network name, CPU count, memory size, and SSH key.
  • Automatically generates an SSH configuration file for easy SSH access to the VMs.

Usage

Prerequisites

  • Ensure you have Terraform and libvirt installed and configured on your system.
  • Ensure you have bash and openssl installed.

Running the Script

  1. Clone the repository and navigate to the directory:

    git clone https://github.com/aryapramudika/kvm-tf-gen.git
cd kvm-tf-gen

  2. Make the script executable:

    chmod +x gen_tf.sh

  3. Run the script with customizable parameters:

    ./gen_tf.sh [options]

    or

    You can edit directly on the script or using input arguments

    vim gen_tf.sh
./gen_tf.sh -k "SSH public key (required)"

Options

  • -c COUNT: Number of VMs to create (default: 3)
  • -b BASE_NAME: Base name for VMs (default: testvm)
  • -i IMAGE: Path to the cloud image (default: /var/lib/libvirt/images/ubuntu-22.04-minimal-cloudimg-amd64.img)
  • -p POOL: Storage pool name (default: data)
  • -d SIZE: Disk size in gigabytes (default: 20)
  • -s IPS: Comma-separated list of static IP addresses (default: 192.168.122.101,192.168.122.102,192.168.122.103)
  • -n NETWORK: Network name (default: default)
  • -u CPU_COUNT: Number of CPUs (default: 1)
  • -m MEMORY: Memory size in MB (default: 1024)
  • -k SSH_KEY: SSH public key (required)
  • -f SSH_CONFIG_PATH: Path for the SSH configuration file (default: ./ssh-config)
  • -h, --help: Display the help message

Example

./gen_tf.sh -c 5 -b myvm -i /path/to/cloud-image.img -p mypool -d 50 -s "192.168.122.201,192.168.122.202,192.168.122.203,192.168.122.204,192.168.122.205" -n custom_network -u 2 -m 2048 -k "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArF4..." -f /custom/path/ssh-config

Run Terraform

terraform init
terraform plan
terraform apply -auto-approve

SSH Access

The script generates an SSH configuration file to simplify SSH access to the VMs. The default path for this file is ./ssh-config, but you can specify a custom path using the -f option.

ssh -F $(PWD)/ssh-config myvm-0

To use the SSH configuration file:

ssh -F /custom/path/ssh-config myvm-0

Files Generated

  • main.tf: Terraform configuration file.
  • cloud-init/user_data.yaml: Cloud-init user data file.
  • cloud-init/network_config.yaml: Cloud-init network configuration file.
  • ssh-config: SSH configuration file (path can be customized).