Creating a VM from a set of disks

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You can create a VM from existing disks. The disks must reside in one of the availability zones and not be added to other VMs.

When you select a disk to attach to a VM, you can specify whether that disk should be deleted when deleting the VM. You can choose this option when creating a VM, updating it, or attaching a new disk to it.

To create a VM from a set of disks:

Management console

CLI

API

Terraform

In the management console, select the folder where you want to create a VM.
Select Compute Cloud.
On the Virtual machines page, click Create VM.
Under Basic parameters, enter a name and description for the VM.
- Length — from 3 to 63 characters.
- The name may contain lowercase Latin letters, numbers, and hyphens.
- The first character must be a letter. The last character can't be a hyphen.
Note

The VM name is used to generate the FQDN only once, when creating the VM. If the FQDN is important to you, choose an appropriate name for the VM at the creation stage.
In the Availability zone section, select the desired availability zone. More about the geo scope of Yandex.Cloud.
Select one of the public images.
Under Disks, click Add disk:
- Enter the disk name.
- Specify the necessary disk size.
- Select the disk type.
- Under Content, choose Disk. If you don't have a disk, create one.
Under Computing resources:
- Choose a platform.
- Select the performance level and number of vCPUs and RAM you need.
Under Network settings, select a network from the list or create a new one by clicking Create new network.
Select the desired subnet from the list or create a new one by clicking Create new subnet.
Select the appropriate public IP address option.
Select the appropriate security groups (if there is no corresponding field, all incoming and outgoing traffic will be allowed for the VM).
Under Access, specify the data required to access the VM:
- Enter the username in the Login field.
- In the SSH key field, paste the contents of the public key file. Create a key pair for connecting to an instance over SSH on your own.
Click Create VM.

If you don't have the Yandex.Cloud command line interface yet, install and initialize it.

The folder specified in the CLI profile is used by default. You can specify a different folder using the --folder-name or --folder-id parameter.

View the description of the CLI command for creating a VM:
```
$ yc compute instance create --help
```

Get a list of disks in the default folder:

yc compute disk list

Result:

+----------------------+--------------+-------------+---------------+--------+----------------------+-------------------------+
|          ID          |     NAME     |    SIZE     |     ZONE      | STATUS |     INSTANCE IDS     |       DESCRIPTION       |
+----------------------+--------------+-------------+---------------+--------+----------------------+-------------------------+
| a7lqgbt0bb9s40tifuhc | first-disk   | 20401094656 | ru-central1-a | READY  | a7lcvu28njbhnkcteb5n |                         |
| a7lv5j5hm1p1hppprga7 | second-disk  | 21474836480 | ru-central1-a | READY  |                      |                         |
+----------------------+--------------+-------------+---------------+--------+----------------------+-------------------------+

Select the identifier (ID) or name (NAME) of the necessary disks.
Create a VM in the default folder:
```
$ yc compute instance create \
    --name first-instance \
    --zone ru-central1-a \
    --network-interface subnet-name=default-a,nat-ip-version=ipv4 \
    --use-boot-disk disk-name=first-disk \
    --attach-disk disk-name=second-disk \
    --ssh-key ~/.ssh/id_rsa.pub
```
This command creates the VM:
- Named first-instance.
- In the ru-central1-a availability zone.
- In the default-a subnet.
- With a public IP address and two disks.
To create a VM without a public IP, remove the --public-ip flag.
- Length — from 3 to 63 characters.
- The name may contain lowercase Latin letters, numbers, and hyphens.
- The first character must be a letter. The last character can't be a hyphen.
Note

The VM name is used to generate the FQDN only once, when creating the VM. If the FQDN is important to you, choose an appropriate name for the VM at the creation stage.

To specify whether to delete the disk when deleting the VM, set the --auto-delete flag:
```
yc compute instance create \
--name first-instance \
--zone ru-central1-a \
--network-interface subnet-name=default-a,nat-ip-version=ipv4 \
--use-boot-disk disk-name=first-disk,auto-delete=yes \
--attach-disk disk-name=second-disk,auto-delete=yes \
--ssh-key ~/.ssh/id_rsa.pub
```

Use the Create method for the Instance resource.

If you don't have Terraform yet, install it and configure the Yandex.Cloud provider.

To create a VM from a set of disks:

In the configuration file, describe the parameters of resources that you want to create:

Note

If you already have suitable resources, such as a cloud network and subnet, you don't need to describe them again. Use their names and IDs in the appropriate parameters.
- yandex_compute_instance: Description of the VM:
  - name: VM name.
  - platform_id: The platform.
  - resources: The number of vCPU cores and the amount of RAM available to the VM. The values must match the selected platform.
  - boot_disk: Boot disk settings. Specify the disk ID. If you have no boot disk available, specify the ID of a public image using the image_id parameter.
  - secondary_disk: Secondary disk to attach to the VM. Specify the ID of the secondary disk. If you don't have a disk, create one.
  - network_interface: Network settings. Specify the ID of the selected subnet. To automatically assign a public IP address to the VM, set nat = true.
  - metadata: In the metadata, pass the public key for accessing the VM via SSH. For more information, see VM instance metadata.
- yandex_vpc_network: Description of the cloud network.
- yandex_vpc_subnet: Description of the subnet that the VM will be connected to.
Example configuration file structure:
```
resource "yandex_compute_instance" "vm-1" {

  name        = "vm-from-disks"
  platform_id = "standard-v3"

  resources {
    cores  = <number of vCPU cores>
    memory = <RAM in GB>
  }

  boot_disk {
    initialize_params {
      disk_id = "<boot disk ID>"
    }
  }

  secondary_disk {
    disk_id = "<secondary disk ID>"
  }

  network_interface {
    subnet_id = "${yandex_vpc_subnet.subnet-1.id}"
    nat       = true
  }

  metadata = {
    ssh-keys = "<username>:<SSH key contents>"
  }
}

resource "yandex_vpc_network" "network-1" {
  name = "network1"
}

resource "yandex_vpc_subnet" "subnet-1" {
  name       = "subnet1"
  zone       = "<availability zone>"
  network_id = "${yandex_vpc_network.network-1.id}"
}
```
For more information about the resources you can create using Terraform, see the provider documentation.
Make sure that the configuration files are correct.
1. In the command line, go to the directory where you created the configuration file.
2. Run the check using the command:
```
$ terraform plan
```
If the configuration is described correctly, the terminal displays a list of created resources and their parameters. If there are errors in the configuration, Terraform points them out.
Deploy the cloud resources.
1. If the configuration doesn't contain any errors, run the command:
```
$ terraform apply
```
2. Confirm that you want to create the resources.
Afterwards, all the necessary resources are created in the specified folder. You can check resource availability and their settings in the management console.

Creating a VM from a set of disks

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