Making a VM preemptible
You can create a preemptible VM or change the type of a VM that already exists.
Note
Creating a preemptible VM
To create a preemptible VM:
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In the management console
, select the folder where you want to create your preemptible VM. -
Go to Compute Cloud.
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In the left-hand panel, select
Virtual machines. -
Click Create virtual machine.
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Select Advanced setup.
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Under Boot disk image, select an image and OS version.
To create a VM from an existing boot disk, go to the Custom tab and select the boot disk you need. To update disk settings, click
next to the disk name. -
Under Location, select the availability zone to host your preemptible VM.
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Optionally, configure the boot disk under Disks and file storages:
- Select the disk type.
- Specify the required disk size.
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Optionally, to encrypt a boot disk or a secondary disk, under Disks and file storages, click
to the right of the disk name and configure encryption parameters for the disk:- Select Encrypted disk.
- In the KMS key field, select the key you want to use to encrypt the disk. To create a new key, click Create.
To create an encrypted disk, you need the
kms.keys.userrole or higher.Warning
You can specify encryption settings only when creating a disk. You cannot disable or change disk encryption. You also cannot enable encryption for an existing disk.
If you deactivate the key used to encrypt a disk, image, or snapshot, access to the data will be suspended until you reactivate the key.
Alert
If you destroy the key or its version used to encrypt a disk, image, or snapshot, you will irrevocably lose access to the data. For details, see Destroying key versions.
If you are creating a VM instance from an existing boot disk, update the settings of that disk in the Custom tab under Boot disk image at the top of the form.
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Optionally, add a secondary disk:
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Under Disks and file storages, click Add.
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In the window that opens, select Disk. You can select an existing disk or create a new one, either empty or from a snapshot or image.
For example, to create a new empty disk:
- Select
Create new. - In the Contents field, select
Empty. - Enter a name for the disk.
- Select the disk type.
- Specify the required disk and block size.
- Optionally, enable Additional in the Delete along with the virtual machine field if you need this disk automatically deleted when deleting the VM.
- Click Add disk.
- Select
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Optionally, connect a file storage:
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Under Disks and file storages, click Add.
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In the window that opens, select File storage and choose the storage you want to connect from the list.
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Click Add file storage.
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Under Computing resources:
- Navigate to the Custom tab.
- Select a platform.
- Specify the guaranteed performance and required number of vCPUs, as well as RAM size.
- In the Additional field, enable Preemptible.
- Optionally, enable a software-accelerated network.
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Under Network settings:
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In the Subnet field, enter the ID of a subnet in the new VM’s availability zone. Alternatively, select a cloud network from the list.
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Each network must have at least one subnet. If your network has no subnets, create one by selecting Create subnet.
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If you do not have a network, click Create network to create one:
- In the window that opens, specify the network name and select the folder to host the network.
- Optionally, enable the Create subnets setting to automatically create subnets in all availability zones.
- Click Create network.
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In the Public IP address field, select an IP address assignment method:
Auto: To assign a random IP address from the Yandex Cloud IP address pool. In this case, you can enable DDoS protection using the option below.List: To select a public IP address from the list of previously reserved static addresses. For more information, see Converting a dynamic public IP address to static.No address: Not to assign a public IP address.
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Select the relevant security groups. If you leave this field empty, the default security group will be assigned to the VM.
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Expand Additional and select a method for assigning internal addresses in the Internal IPv4 address field:
Auto: To assign a random IP address from the pool of IP addresses available in the selected subnet.Manual: To manually assign a private IP address to the VM.- Enable DDoS protection, if required. The option is available if you previously selected the automatic IP assignment method in the public address settings.
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Optionally, create records for your VM in the DNS zone:
- Expand DNS settings for internal addresses and click Add record.
- Specify a zone, FQDN, and TTL for the record. When setting the FQDN, you can enable
Detect automaticallyfor the zone.
You can add multiple records to internal DNS zones. For more information, see Cloud DNS integration with Compute Cloud. - To create another record, click Add record.
If you want to add another network interface to your VM, click Add network interface and repeat the settings from this step for the new interface. You can add up to eight network interfaces to a single VM.
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Under Access:
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Select Access by OS Login to connect and manage access to the new VM using OS Login in Yandex Identity Hub.
With OS Login, you can connect to VMs using SSH keys and SSH certificates via a standard SSH client or the Yandex Cloud CLI. OS Login enables rotating the SSH keys used to access VMs, providing the most secure access option.
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If you prefer not to use OS Login, select SSH key and specify the following VM access data:
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Under Login, enter a username.
Alert
Do not use
rootor other reserved usernames. To perform operations requiring root privileges, use thesudocommand. -
In the SSH key field, select the SSH key saved in your organization user profile.
If there are no SSH keys in your profile or you want to add a new key:
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Click Add key.
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Enter a name for the SSH key.
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Select one of the following:
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Enter manually: Paste the contents of the public SSH key. You need to create an SSH key pair on your own. -
Load from file: Upload the public part of the SSH key. You need to create an SSH key pair on your own. -
Generate key: Automatically create an SSH key pair.When adding a new SSH key, an archive containing the key pair will be created and downloaded. In Linux or macOS-based operating systems, unpack the archive to the
/home/<user_name>/.sshdirectory. In Windows, unpack the archive to theC:\Users\<user_name>/.sshdirectory. You do not need additionally enter the public key in the management console.
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Click Add.
The system will add the SSH key to your organization user profile. If the organization has disabled the ability for users to add SSH keys to their profiles, the added public SSH key will only be saved in the user profile inside the newly created resource.
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If you want to add multiple users with SSH keys to the VM at the same time, specify these users' data under Metadata. You can also use metadata to install additional software on a VM when creating it.
In public Linux images provided by Yandex Cloud, the functionality of connecting over SSH using login and password is disabled by default.
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Under General information, specify a name for the preemptible VM:
- It must be from 2 to 63 characters long.
- It can only contain lowercase Latin letters, numbers, and hyphens.
- It must start with a letter and cannot end with a hyphen.
Note
The VM name is used to generate an internal FQDN, which is set only once, when you create the VM. If the internal FQDN is important to you, make sure to choose an appropriate name for your VM.
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Under Additional:
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Optionally, select or create a service account. With a service account, you can flexibly configure access permissions for your resources.
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Optionally, enable access to the serial console.
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Optionally, under Backup, enable Connect and select or create a backup policy to make automatic backups of your VMs using Cloud Backup.
For more information, see Connecting Compute Cloud VMs and Yandex BareMetal servers to Cloud Backup.
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Optionally, to configure delivering Linux metrics and any additional metrics from your apps, enable Monitoring under Agent for delivering metrics and select:
- Yandex Monitoring: Install an agent to collect additional metrics from VM instances and apps.
- Yandex Managed Service for Prometheus®: Install and configure an agent to collect additional metrics from VM instances and apps in Prometheus format:
- Select or create a workspace to store your metrics.
- Optionally, describe the delivery parameters for your custom metrics, in JSON format.
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Optionally, under Placement, select a VM placement group.
-
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Click Create VM.
The preemptible VM will appear in the list.
If you do not have the Yandex Cloud CLI installed yet, install and initialize it.
By default, the CLI uses the folder specified when creating the profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also set a different folder for any specific command using the --folder-name or --folder-id parameter.
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See the description of the CLI command for creating a preemptible VM:
yc compute instance create --help -
Prepare a key pair (public and private keys) for SSH access to the preemptible VM.
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Select a public Linux-based image from Yandex Cloud Marketplace, e.g., CentOS 7.
To get a list of available images using the CLI, run this command:
yc compute image list --folder-id standard-imagesResult:
+----------------------+-------------------------------------+--------------------------+----------------------+--------+ | ID | NAME | FAMILY | PRODUCT IDS | STATUS | +----------------------+-------------------------------------+--------------------------+----------------------+--------+ ... | fdvk34al8k5n******** | centos-7-1549279494 | centos-7 | dqni65lfhvv2******** | READY | | fdv7ooobjfl3******** | windows-2016-gvlk-1548913814 | windows-2016-gvlk | dqnnc72gj2is******** | READY | | fdv4f5kv5cvf******** | ubuntu-1604-lts-1549457823 | ubuntu-1604-lts | dqnnb6dc7640******** | READY | ... +----------------------+-------------------------------------+--------------------------+----------------------+--------+Where:
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ID: Image ID. -
NAME: Image name. -
FAMILY: ID of the image family the image belongs to. -
PRODUCT IDS: IDs of Yandex Cloud Marketplace products associated with the image. -
STATUS: Current status of the image. It may take one of the following values:STATUS_UNSPECIFIED: Image status is not defined.CREATING: Image is being created.READY: Image is ready to use.ERROR: You cannot use the image due to an issue.DELETING: Image is being deleted.
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Create a preemptible VM in the default folder:
yc compute instance create \ --name first-preemptible-instance \ --zone ru-central1-a \ --network-interface subnet-name=default-a,nat-ip-version=ipv4 \ --preemptible \ --create-boot-disk image-folder-id=standard-images,image-family=centos-7,kms-key-id=<key_ID> \ --ssh-key ~/.ssh/id_ed25519.pubNote
If you are using CLI 0.92.0 or lower, you also need to specify the VM platform in the command:
--platform standard-v3. You can find out your CLI version using theyc versioncommand. To install the latest version, runyc components update.Where:
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--name: Name of the preemptible VM. The naming requirements are as follows:- It must be from 2 to 63 characters long.
- It can only contain lowercase Latin letters, numbers, and hyphens.
- It must start with a letter and cannot end with a hyphen.
Note
The VM name is used to generate an internal FQDN, which is set only once, when you create the VM. If the internal FQDN is important to you, make sure to choose an appropriate name for your VM.
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--zone: Availability zone matching the selected subnet. -
--network-interface: VM network interface settings:subnet-name: Name of the selected subnet.nat-ip-version=ipv4: Public IP address. To create a VM without a public IP address, omit this parameter.
If you want to add multiple network interfaces to your VM, specify the
--network-interfaceparameter as many times as you need. You can add up to eight network interfaces to a single VM. -
--preemptible: Select to create a preemptible VM. -
--create-boot-disk: VM boot disk settings:-
image-family: Image family, e.g.,centos-7. This option allows you to install the latest version of the OS from the specified family. -
kms-key-id: ID of the KMS symmetric key to create an encrypted boot disk. This is an optional setting.To create an encrypted disk, you need the
kms.keys.userrole or higher.Warning
You can specify encryption settings only when creating a disk. You cannot disable or change disk encryption. You also cannot enable encryption for an existing disk.
If you deactivate the key used to encrypt a disk, image, or snapshot, access to the data will be suspended until you reactivate the key.
Alert
If you destroy the key or its version used to encrypt a disk, image, or snapshot, you will irrevocably lose access to the data. For details, see Destroying key versions.
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--ssh-key: Path to the file with the public SSH key. The preemptible VM will automatically create a user namedyc-userfor this key.When creating a VM from a Yandex Cloud Marketplace public image, make sure to provide an SSH key, as SSH access with a username and password is disabled by default for such images.
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If you do not have Terraform yet, install it and configure the Yandex Cloud provider.
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In the configuration file, describe the properties of resources you want to create:
resource "yandex_compute_disk" "boot-disk" { name = "<disk_name>" type = "<disk_type>" zone = "<availability_zone>" size = "<disk_size>" image_id = "<image_ID>" } 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_vCPUs> memory = <RAM_in_GB> } boot_disk { disk_id = yandex_compute_disk.boot-disk.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:
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yandex_compute_disk: Boot disk description:-
name: Disk name. -
type: Disk type. -
zone: Availability zone the disk will reside in. -
size: Disk size in GB. -
image_id: ID of the image to create the preemptible VM from. You can get the image ID from the list of public images.You can also view image IDs in the management console
when creating a VM or in Cloud Marketplace on the image page under Product IDs.
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yandex_compute_instance: Description of the preemptible VM:-
name: Name of the preemptible VM. -
allow_stopping_for_update: Permission to stop the VM for updates. Set totrueif you plan to change your VM's network settings or computing resources using Terraform. The default value isfalse. -
platform_id: Platform. -
zone: Availability zone to host the preemptible VM. -
resources: Number of vCPUs and amount of RAM available to the preemptible VM. The values must match the selected platform. -
boot_disk: Boot disk settings. Specify the disk ID. -
network_interface: VM network interface settings. Specify the ID of the selected subnet. To automatically assign a public IP address to the VM, setnat = true.If you want to add multiple network interfaces to your VM, specify the
network_interfacesection as many times as you need. You can add up to eight network interfaces to a single VM. -
metadata: In metadata, provide the public key for SSH access to the preemptible VM. For more information, see VM metadata. -
scheduling_policy: Scheduling policy. To create a preemptible VM, selectpreemptible = true.
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yandex_vpc_network: Cloud network description. -
yandex_vpc_subnet: Description of the subnet to connect your preemptible VM to.
Note
If you already have suitable resources, such as a cloud network and subnet, you do not need to redefine them. Specify their names and IDs in the appropriate parameters.
For more information about the resources you can create with Terraform, see this provider guide.
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Create the resources:
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In the terminal, go to the directory where you edited the configuration file.
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Make sure the configuration file is correct using this command:
terraform validateIf the configuration is correct, you will get this message:
Success! The configuration is valid. -
Run this command:
terraform planYou will see a detailed list of resources. No changes will be made at this step. If the configuration contains any errors, Terraform will show them.
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Apply the changes:
terraform apply -
Type
yesand press Enter to confirm the changes.
This will create all the resources you need in the specified folder. You can check the new resources and their settings using the management console
. -
Use the create REST API method for the Instance resource or the InstanceService/Create gRPC API call.
When a VM is created, it is assigned an IP address and hostname (FQDN). This data can be used for SSH access.
You can make a public IP address static. For more information, see Making a VM public IP address static.
Changing the VM type
To change the type of a VM, such as making it non-preemptible:
- In the management console
, select the folder where the preemptible VM is located. - Go to Compute Cloud.
- In the left-hand panel, select
Virtual machines. - Click
next to the VM you need and select Stop. - In the window that opens, click Stop. The VM status will change to
Stopped. - Click
next to the VM you need and select Edit. - Under Computing resources, disable Preemptible.
- Click Save changes.
- At the top right, click
Start. - In the window that opens, click Start.
If you do not have the Yandex Cloud CLI installed yet, install and initialize it.
By default, the CLI uses the folder specified when creating the profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also set a different folder for any specific command using the --folder-name or --folder-id parameter.
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See the description of the CLI command for stopping a VM:
yc compute instance stop --help -
Get a list of all VMs in the default folder:
yc compute instance listResult:
+----------------------+-----------------+---------------+---------+----------------------+ | ID | NAME | ZONE ID | STATUS | DESCRIPTION | +----------------------+-----------------+---------------+---------+----------------------+ | fhm0b28lgfp4******** | first-instance | ru-central1-a | RUNNING | my first vm via CLI | | fhm9gk85nj7g******** | second-instance | ru-central1-a | RUNNING | my second vm via CLI | +----------------------+-----------------+---------------+---------+----------------------+ -
Select
IDorNAMEof the VM, e.g.,first-instance. -
Stop the VM:
yc compute instance stop <VM_name_or_ID>Result:
done (15s) -
Edit the VM parameters:
yc compute instance update <VM_name_or_ID> \ --preemptible=falseResult:
done (1s) id: fhm0b28lgfp4******** folder_id: b1ghgf288nvg******** ... network_settings: type: STANDARD placement_policy: {} -
Restart the VM:
yc compute instance start <VM_name_or_ID>Result:
done (11s) id: fhm0b28lgfp4******** folder_id: b1ghgf288nvg******** ... network_settings: type: STANDARD placement_policy: {}
If you do not have Terraform yet, install it and configure the Yandex Cloud provider.
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In the configuration file, find the section specifying the scheduling policy of the VM you want to make non-preemptible:
scheduling_policy { preemptible = true } -
Delete the
scheduling_policyfield with thepreemptible = truevalue.For more information about the resources you can create with Terraform, see this provider guide.
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Make sure the configuration files are correct.
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In the command line, navigate to the directory where you created the configuration file.
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Run a check using this command:
terraform plan
If the configuration description is correct, the terminal will display a list of the resources being created and their settings. If the configuration contains any errors, Terraform will point them out.
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Deploy the cloud resources.
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If the configuration does not contain any errors, run this command:
terraform apply -
Confirm creating the resources.
This will create all the resources you need in the specified folder. You can check the new resources and their settings using the management console
. -
Use the update REST API method for the Instance resource or the InstanceService/Update gRPC API call. Under schedulingPolicy in the request body, specify "preemptible": false.
This will affect the cost of running this VM. Learn more about VM pricing here.