Create an instance in a placement group

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Yandex Cloud

Updated at October 30, 2024

Create a VM in a placement group.

You can work with placement groups with the partition placement strategy using the CLI and API.

CLI

Terraform

API

If you do not 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 to create a placement group:
```
yc compute placement-group create --help
```
Create a placement group in the default folder with one of the placement strategies:
- Spread placement:
```
yc compute placement-group create \
  --spread-strategy \
  --name <placement_group_name>
```
  Where:
  - --spread-strategy: Shows that the spread placement strategy is selected.
  - --name: Placement group name.
- Partition placement:
```
yc compute placement-group create \
  --partitions <partition_count> \
  --name <placement_group_name>
```
  Where:
  - --partitions: Shows that the partition placement strategy is selected with the number of partitions specified: from 1 to 5.
  - --name: Placement group name.
View the description of the CLI command to create a VM:
```
yc compute instance create --help
```
Create a VM:
```
yc compute instance create \
  --zone ru-central1-a \
  --name instance-in-group-1 \
  --placement-group-name my-group \
  --placement-group-partition <partition_number>
```
Where:
- --zone: Availability zone for the VM.
- --name: VM name.
- --placement-group-name: Placement group name.
- --placement-group-partition: Partition number in the placement group with the partition placement strategy.
  
  Note
  
  If you do not specify the partition number when creating a VM in a partition placement group, the VM will be added to a random partition.
Result:
```
id: epdep2kq6dt5********
...
placement_policy:
  placement_group_id: fd83bv4rnsna********
```

Check the new instance and its placement group:

yc compute placement-group list-instances --name my-group

Where --name is the placement group name.

Result:

+----------------------+---------------------+-------------------+---------+-------------+-------------+
|          ID          |        NAME         |      ZONE ID      | STATUS  | EXTERNAL IP | INTERNAL IP |
+----------------------+---------------------+-------------------+---------+-------------+-------------+
| epdep2kq6dt5******** | instance-in-group-1 | ru-central1-a | RUNNING |             | 10.129.0.5  |
+----------------------+---------------------+-------------------+---------+-------------+-------------+

Terraform allows you to quickly create a cloud infrastructure in Yandex Cloud and manage it using configuration files. Configuration files store the infrastructure description in the HashiCorp Configuration Language (HCL). Terraform and its providers are distributed under the Business Source License.

For more information about the provider resources, see the documentation on the Terraform website or the mirror.

If you change the configuration files, Terraform automatically detects which part of your configuration is already deployed, and what should be added or removed.

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

To create a VM instance in a placement group:

In the configuration file, describe the VM parameters specifying the yandex_compute_placement_group resource in the placement_group_id field. The yandex_compute_instance resource describes the VM parameters.

Here is an example of the configuration file structure:
```
...
resource "yandex_compute_instance" "vm-1" {
  name        = "linux-vm"
  platform_id = "standard-v3"
  placement_policy {
    placement_group_id = "${yandex_compute_placement_group.group1.id}"
  }
}

resource "yandex_compute_placement_group" "group1" {
  name = "test-pg"
}
...
```
Where placement_group_id is the placement group ID.

For more information about the yandex_compute_instance and yandex_compute_placement_group resource parameters in Terraform, see the provider documentation.
In the command line, go to the directory with the Terraform configuration file.
Check the configuration using this command:
```
terraform validate
```
If the configuration is correct, you will get this message:
```
Success! The configuration is valid.
```
Run this command:
```
terraform plan
```
The terminal will display a list of resources with parameters. No changes will be made at this step. If the configuration contains any errors, Terraform will point them out.
Apply the configuration changes:
```
terraform apply
```
Confirm the changes: type yes into the terminal and press Enter.

All the resources you need will then be created in the specified folder. You can check that the VM has been created and added to the placement group using the management console.

Use the create REST API method for the Instance resource or the InstanceService/Create gRPC API call.

Create an instance in a placement group

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