README.md

Example using Openstack to deploy multiple virtual machines

This folder contains a set of Terraform configuration files (sometimes informally referred to as a "manifest") that serve as examples for how you can use this module to define multiple Openstack virtual machines.

This example follows the Standard Module Structure as defined by Hashicorp and uses the recommended filenames of:

• main.tf - primary entrypoint containing several virtual_machine module definitions
• variables.tf - defines the virtual_machine object used to configure the module
• terraform.tfvars - defines the default values for the virtual_machine object used to configure the module
• outputs.tf - optional file that can be used to output useful information about the managed virtual machines.

Quick start

To deploy multiple Openstack virtual machines:

1. Copy this example directory to a new location
2. Modify terraform.tfvars to contain the values common to all virtual machines you'd like to create.

   NOTE The virtual_machine configuration object requires all attributes to be defined. As such, you will need to use a null value for attributes you do not want to set.

3. Modify main.tf to contain module definitions for each virtual machine you'd like to create.

   TIP By using the merge function you can override any value defined in the terraform.tfvars file for a specific virtual machine instance.

4. Run terraform init.

   This command initializes a working directory containing Terraform configuration files and ensures the working directory is up to date with changes in your configuration files should you run it multiple times.

5. Run [terraform plan]https://developer.hashicorp.com/terraform/cli/commands/plan).

   This command creates an execution plan, which lets you preview the changes that Terraform plans to make to your infrastructure.

6. Run terraform apply.

   This command executes the actions proposed in the terraform plan

7. ssh into one of the virtual machines to validate connectivity
8. Run terraform destroy.

   This command destroys all remote virtual machines managed by the Terraform configuration.