Creating a VM

Using Terraform you can create virtual machines. As an example, a VM will be created that is accessible from an external network. To access the VM, a pair of SSH keys already existing in the project will be used.

Two options for VM configuration will be considered: without additional settings and with an additional disk connected.

1. Review the available resources and quotas for the region where you plan to create a VM. Different regions may have different quotas configured.

   If you want to increase quotas, contact technical support.

2. Install Terraform and configure the provider if not already done.

   Place the provider settings in the Terraform configuration file provider.tf.

3. Make sure the OpenStack client is installed and then authenticate with the project.

4. Create a Terraform configuration file variables.tf with variables:

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   variable "image_flavor" {  type = string  default = "Ubuntu-22.04-202208"}variable "compute_flavor" {  type = string  default = "STD2-2-4"}variable "key_pair_name" {  type = string  default = "keypair-terraform"}variable "availability_zone_name" {  type = string  default = "MS1"}

   This file declares the following variables:

   • image_flavor: the name of the virtual machine image;
   • compute_flavor: the name of the virtual machine configuration template;
   • key_pair_name: the name of the key pair that will be used to connect to the virtual machine via SSH;
   • availability_zone_name: the name of the availability zone where the virtual machine will be hosted.

   If necessary, adjust the values of the variables. First find out their acceptable values:

   image_flavor

   compute_flavor

   key_pair_name

   availability_zone_name

   Using OpenStack CLI:

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   openstack image list

1. Create a network.tf file.

   The file describes the resources of the virtual network in which the VM will operate.

2. Make sure that the following resources are present in network.tf:

   • vkcs_networking_network,
   • vkcs_networking_subnet,
   • vkcs_networking_router,
   • vkcs_networking_router_interface.

   There is no need to configure additional security groups.

The resources arguments are described in the Terraform provider documentation.

Create a main.tf file.

Depending on the required configuration option (a VM without additional settings or a VM with an additional disk), place the contents of one of the tabs below into the file.

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data "vkcs_compute_flavor" "compute" {  name = var.compute_flavor}data "vkcs_images_image" "compute" {  name = var.image_flavor}resource "vkcs_compute_instance" "compute" {  name                    = "compute-instance"  flavor_id               = data.vkcs_compute_flavor.compute.id  key_pair                = var.key_pair_name  security_groups         = ["default","ssh"]  availability_zone       = var.availability_zone_name  block_device {    uuid                  = data.vkcs_images_image.compute.id    source_type           = "image"    destination_type      = "volume"    volume_type           = "ceph-ssd"    volume_size           = 8    boot_index            = 0    delete_on_termination = true  }  network {    uuid = vkcs_networking_network.network.id  }  depends_on = [    vkcs_networking_network.network,    vkcs_networking_subnet.subnetwork  ]}resource "vkcs_networking_floatingip" "fip" {  pool = data.vkcs_networking_network.extnet.name}resource "vkcs_compute_floatingip_associate" "fip" {  floating_ip = vkcs_networking_floatingip.fip.address  instance_id = vkcs_compute_instance.compute.id}output "instance_fip" {  value = vkcs_networking_floatingip.fip.address}

The resources arguments are described in the Terraform provider documentation.

1. Place the Terraform configuration files provider.tf, variables.tf, network.tf and main.tf in the same directory.

2. Go to this directory.

3. Run the command:

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   terraform init

4. Run the command:

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   terraform apply

   When prompted for confirmation, enter yes.

5. Wait until the operation completes.

Once resource creation is complete, the Terraform instance_fip output will show the floating IP address assigned to the VM.

Connect via SSH to the compute-instance virtual machine.

To connect use:

• the IP address from the instance_fip output;
• the private SSH key from the keypair-terraform key pair.

If the example worked successfully, the console will show typical Ubuntu output:

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Welcome to Ubuntu 22.04.1 LTS (GNU/Linux 5.15.0-46-generic x86_64)* Documentation: https://help.ubuntu.com* Management: https://landscape.canonical.com* Support: https://ubuntu.com/advantageSystem information as of Wed May 10 18:05:44 UTC 2023System load: 0.0078125 Processes: 98Usage of /: 35.2% of 7.42GB Users logged in: 0Memory usage: 9% IPv4 address for ens3: 192.168.199.20Swap usage: 0%...

Some of the objects created in this scenario consume resources. If you no longer need them, delete them:

1. Go to the directory with the Terraform configuration files.

2. Run the command:

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   terraform destroy

   When prompted for confirmation, enter yes.

3. Wait until the operation completes.