Making a VM preemptible

If you don't have the Nebius Israel 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.

1. View a description of the CLI create VM command:

   yc compute instance create --help
   

2. Prepare a key pair (public and private keys) for SSH access to the VM.

3. Select a Linux-based public image from Cloud Marketplace, e.g., CentOS 7.

   To get a list of available images using the Nebius Israel CLI, run this command:

   yc compute image list --folder-id standard-images
   

   Result:

   +----------------------+-------------------------------------+--------------------------+----------------------+--------+
   |          ID          |                NAME                 |          FAMILY          |     PRODUCT IDS      | STATUS |
   +----------------------+-------------------------------------+--------------------------+----------------------+--------+
   ...
   | fdvk34al8k5n******** | centos-7-1549279494                 | centos-7                 | dqni65lfhvv2den5gtv9 | READY  |
   | fdv7ooobjfl3******** | windows-2016-gvlk-1548913814        | windows-2016-gvlk        | dqnnc72gj2ist3ktjj1p | READY  |
   | fdv4f5kv5cvf******** | ubuntu-1604-lts-1549457823          | ubuntu-1604-lts          | dqnnb6dc7640c5i968ro | READY  |
   ...
   +----------------------+-------------------------------------+--------------------------+----------------------+--------+
   

4. Create a VM in the default folder:

   yc compute instance create \
     --name first-preemptible-instance \
     --zone il1-a \
     --network-interface subnet-name=default-a,nat-ip-version=ipv4 \
     --preemptible \
     --create-boot-disk image-folder-id=standard-images,image-family=centos-7 \
     --ssh-key ~/.ssh/id_ed25519.pub
   

   Note

   If you are using the CLI version 0.92.0 or lower, then in the command, you must also specify the VM platform: --platform standard-v3. You can find out the CLI version using the yc version command and install the latest version using the yc components update command.

   This command creates a preemptible VM with the following characteristics:

   • Named first-preemptible-instance.
   • Running CentOS 7.
   • In the il1-a availability zone.
   • In the default-a subnet.
   • With a public IP address.

   To create a VM without a public IP address, disable the nat-ip-version=ipv4 option.

   VM naming requirements:

   • The length can be from 3 to 63 characters.
   • It 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 an internal FQDN only once: when creating a VM. If the internal FQDN is important to you, choose an appropriate name for the VM at the creation stage.

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

If you do not have Terraform yet, install it and configure the Nebius Israel provider.

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

   resource "yandex_compute_instance" "vm-1" {
   
     name                      = "preemptible-vm"
     allow_stopping_for_update = true
     platform_id               = "standard-v3"
     zone                      = "<availability_zone>"
   
     resources {
       cores  = <number_of_vCPU_cores>
       memory = <amount_of_RAM_in_GB>
     }
   
     boot_disk {
       initialize_params {
         image_id = "<image_ID>"
       }
     }
   
     network_interface {
       subnet_id = "${yandex_vpc_subnet.subnet-1.id}"
       nat       = true
     }
   
     metadata = {
       ssh-keys = "<username>:<SSH_key_contents>"
     }
   
     scheduling_policy {
       preemptible = true
     }
   }
   
   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}"
   }
   

   Where:

   • yandex_compute_instance: Description of the VM:
     • name: VM name.

     • allow_stopping_for_update: Allow a VM instance to stop to make changes. Set true if you plan to change the network settings, computing resources, disks, or file storage for your VM using Terraform. The default value is false.

     • platform_id: Platform.
     • zone: ID of the availability zone that will host your VM.
     • resources: 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 ID of the selected image. You can get the image ID from the list of public images.
     • 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 metadata, provide the public key for accessing the VM via SSH. For more information, see VM metadata.
     • scheduling_policy: Scheduling policy. To create a preemptible VM, set preemptible = true.
   • yandex_vpc_network: Description of the cloud network.
   • yandex_vpc_subnet: Description of the subnet your VM will connect to.

   Note

   If you already have suitable resources, such as a cloud network and subnet, you do not need to describe them again. Use their names and IDs in the appropriate parameters.

   For more information on resources that you can create with Terraform, see the provider documentation.

2. Create resources:

   1. In the terminal, change to the folder where you edited the configuration file.

   2. Make sure the configuration file is correct using the command:

      terraform validate
      

      If the configuration is correct, the following message is returned:

      Success! The configuration is valid.
      

   3. Run the command:

      terraform plan
      

      The terminal will display a list of resources with parameters. No changes are made at this step. If the configuration contains errors, Terraform will point them out.

   4. Apply the configuration changes:

      terraform apply
      

   5. Confirm the changes: type yes in the terminal and press Enter.

   All the resources you need will then be created in the specified folder. You can check the new resources and their configuration using the management console.

If you don't have the Nebius Israel 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.

1. View a description of the CLI command to stop a VM:

   yc compute instance stop --help
   

2. Get a list of all VMs in the default folder:

   yc compute instance list
   

   Result:

   +----------------------+-----------------+---------------+---------+----------------------+
   |          ID          |       NAME      |    ZONE ID    | STATUS  |     DESCRIPTION      |
   +----------------------+-----------------+---------------+---------+----------------------+
   | fhm0b28lgfp4tkoa3jl6 | first-instance  | il1-a | RUNNING | my first vm via CLI  |
   | fhm9gk85nj7gcoji2f8s | second-instance | il1-a | RUNNING | my second vm via CLI |
   +----------------------+-----------------+---------------+---------+----------------------+
   

3. Select the VM ID or NAME (for example, first-instance).

4. Stop the VM:

   yc compute instance stop <VM ID or name>
   

   Result:

   done (15s)
   

5. Edit the VM parameters:

   yc compute instance update <VM ID or name> \
     --preemptible=false
   

   Result:

   done (1s)
   id: fhm0b28lgfp4tkoa3jl6
   folder_id: b1ghgf288nvg541tgu73
   ...
   network_settings:
     type: STANDARD
   placement_policy: {}
   

6. Start the VM again:

   yc compute instance start <VM ID or name>
   

   Result:

   done (11s)
   id: fhm0b28lgfp4tkoa3jl6
   folder_id: b1ghgf288nvg541tgu73
   ...
   network_settings:
     type: STANDARD
   placement_policy: {}
   

Use the update REST API method for the Instance resource or the InstanceService/Update gRPC API call. In the request body, set "preemptible": false in schedulingPolicy.

If you do not have Terraform yet, install it and configure the Nebius Israel provider.

1. In the configuration file, find a description of the scheduling policy of the VM you want to make preemptible:

   scheduling_policy {
     preemptible = true
   }
   

2. Delete the scheduling_policy field set to preemptible = true:

   For more information on resources you can create with Terraform, see the provider documentation.

3. Make sure the configuration files are valid.

   1. In the command line, go to the directory where you created the configuration file.

   2. Run the check using this command:

      terraform plan
      

   If the configuration is described correctly, the terminal will display a list of created resources and their parameters. If the configuration contains any errors, Terraform will point them out.

4. Deploy cloud resources.

   1. If the configuration does not contain any errors, run this command:

      terraform apply
      

   2. Confirm that you want to create the resources.

   All the resources you need will then be created in the specified folder. You can check that the resources are there and their settings are correct using the management console.