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Create and manage virtual disks in Google Distributed Cloud

This document is intended for application owners that run Google Distributed Cloud. This document shows you how to create and manage disk resources for virtual machines (VMs) that use VM Runtime on Google Distributed Cloud.

Before you begin

To complete this document, you need access to the following resources:

Access to Google Distributed Cloud version 1.12.0 (anthosBareMetalVersion: 1.12.0) or higher cluster. You can use any cluster type capable of running workloads. If needed, try Google Distributed Cloud on Compute Engine or see the cluster creation overview.
The virtctl client tool installed as a plugin for kubectl. If needed, install the virtctl client tool.

Create a VM with an attached disk

When you create a VM, you can attach an existing boot or data disk, create a disk from an image (including for the boot disk), or create a blank disk.

Blank disk

In this scenario, you create a blank disk and attach it to the VM. This scenario lets you create a data disk to store application data.

Create a manifest that defines a VirtualMachineDisk and VirtualMachine, such as my-vm.yaml, in the editor of your choice:
```
nano my-vm.yaml
```

Copy and paste the following YAML definition:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: DISK_NAME
spec:
  size: 10Gi
---
apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachine
metadata:
  name: VM_NAME
spec:
  interfaces:
    - name: eth0
      networkName: pod-network
      default: true
  disks:
    - boot: true
      virtualMachineDiskName: VM_NAME-boot-dv
    - virtualMachineDiskName: DISK_NAME

This example creates a blank 10Gi (10 gibibyte) disk named DISK_NAME. In the VM's spec.disks section, you must also attach a boot disk, such as from an image as shown in the next section.

Save and close the manifest file in your editor.
Create the VM and disk using kubectl:
```
kubectl apply -f my-vm.yaml
```

From image

In this scenario, you create a disk from an image and attach it to the VM. This scenario lets you create a boot disk, for example, from an image. You can also create and attach data disks from an image.

Create a manifest that defines a VirtualMachineDisk and VirtualMachine, such as my-vm.yaml, in the editor of your choice:
```
nano my-vm.yaml
```

Copy and paste the following YAML definition:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: VM_NAME-boot-dv
spec:
  size: 20Gi
  source:
    http:
      url: https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-amd64.img
---
apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachine
metadata:
  name: VM_NAME
spec:
  interfaces:
    - name: eth0
      networkName: pod-network
      default: true
  disks:
    - boot: true
      virtualMachineDiskName: VM_NAME-boot-dv

This example creates a 20Gi (20 gibibyte) disk named VM_NAME-boot-dv using a public Ubuntu image. In the VM's spec.disks section, the disk is set to boot: true.

Save and close the manifest in your editor.
Create the VM and disk using kubectl:
```
kubectl apply -f my-vm.yaml
```

Existing disk

In this scenario, you create a blank disk and attach it to the VM. This scenario lets you create a data disk to store application data.

Create a VirtualMachine manifest, such as my-vm.yaml, in the editor of your choice:
```
nano my-vm.yaml
```

Copy and paste the following YAML definition:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachine
metadata:
  name: VM_NAME
spec:
  interfaces:
    - name: eth0
      networkName: pod-network
      default: true
  disks:
    - boot: true
      virtualMachineDiskName: VM_NAME-boot-dv
    - virtualMachineDiskName: EXISTING_DISK_NAME

This example attaches an existing disk named EXISTING_DISK_NAME.

In the VM's spec.disks section, you must also attach a boot disk, such as from an image as shown in the preceding section.

Save and close the VM manifest in your editor.
Create the VM using kubectl:
```
kubectl apply -f my-vm.yaml
```

Create and attach disks to existing VM

If you have an existing VM, you can create and attach disks to support your application lifecycles. The VM must be in a stopped state before you attach a disk.

Blank disk

In this scenario, you create a blank disk and attach it to the VM. This scenario lets you create a data disk to store application data.

Use kubectl to stop the VM, if needed:
```
kubectl virt stop vm VM_NAME
```
Replace VM_NAME with the name of the VM that you want to stop.
Edit your existing VM resource, such as my-vm:
```
kubectl edit gvm VM_NAME
```

Update the VirtualMachine YAML manifest to add a VirtualMachineDisk section at the top, and then attach the disk at the end of the VM's spec.disks section:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: DISK_NAME
spec:
  size: 10Gi
---
apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachine
metadata:
  name: VM_NAME
spec:
  interfaces:
    - name: eth0
      networkName: pod-network
      default: true
  disks:
    - boot: true
      virtualMachineDiskName: VM_NAME-boot-dv
    - virtualMachineDiskName: DISK_NAME

This example creates a blank 10Gi (10 gibibyte) disk named DISK_NAME.

Save and close the updated VM manifest in your editor.
Use kubectl to start the VM:
```
kubectl virt start vm VM_NAME
```
Replace VM_NAME with the name of the VM that you want to start.

From image

In this scenario, you create a disk from a source image and attach it to the VM.

Use kubectl to stop the VM, if needed:
```
kubectl virt stop vm VM_NAME
```
Replace VM_NAME with the name of the VM that you want to stop.
Edit your existing VM resource, such as my-vm:
```
kubectl edit gvm VM_NAME
```

Update the VirtualMachine manifest to add a VirtualMachineDisk section at the top, and then attach the disk at the end of the VM's spec.disks section:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: DISK_NAME
spec:
  size: 10Gi
  source:
    http:
      url: http://example.com/my-disk-img.qcow2
---
apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachine
metadata:
  name: VM_NAME
spec:
  interfaces:
    - name: eth0
      networkName: pod-network
      default: true
  disks:
    - boot: true
      virtualMachineDiskName: VM_NAME-boot-dv
    - virtualMachineDiskName: DISK_NAME

This example creates a 10Gi (10 gibibyte) disk named DISK_NAME from the http://example.com/my-disk-img.qcow2 HTTP source.

Save and close the updated VM manifest in your editor.
Use kubectl to start the VM:
```
kubectl virt start vm VM_NAME
```
Replace VM_NAME with the name of the VM that you want to start.

Create a disk

In this scenario, you create the disk resources separately from the VM resources. This scenario lets you create disks ahead of time, and then attach to VMs as needed.

Blank disk

To create a blank disk, complete the following steps.

Create a VirtualMachineDisk manifest, such as my-disk.yaml, in the editor of your choice:
```
nano my-disk.yaml
```

Copy and paste the following YAML definition:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: DISK_NAME
spec:
  size: 10Gi

This example creates a blank 10Gi (10 gibibyte) disk named DISK_NAME.

Save and close the disk manifest in your editor.
Create the disk using kubectl:
```
kubectl apply -f my-disk.yaml
```

From image

To create a disk from an image, complete the following steps.

Create a VirtualMachineDisk manifest, such as my-disk.yaml, in the editor of your choice:
```
nano my-disk.yaml
```

Copy and paste the following YAML definition:

apiVersion: vm.cluster.gke.io/v1
kind: VirtualMachineDisk
metadata:
  name: DISK_NAME
spec:
  size: 20Gi
  source:
    http:
      url: https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-amd64.img

This example creates a 20Gi (20 gibibyte) disk named DISK_NAME using a public Ubuntu image.

Save and close the disk manifest in your editor.
Create the disk using kubectl:
```
kubectl apply -f my-disk.yaml
```

What's next

Create and use credentials to import images from Cloud Storage.
Create and use storage classes in Google Distributed Cloud.
When you no longer need VMs or their virtual disk resources, Delete a VM in Google Distributed Cloud.