Manage the VM instance lifecycle

A VM instance can transition through many states throughout its lifecycle. When you create a VM, Google Distributed Cloud (GDC) air-gapped appliance provisions resources to start the VM. Next, the VM moves into the start state, where it prepares for a first boot. During and after start-up, a VM is considered to be running. During its lifetime, a running VM can be repeatedly stopped and restarted, or suspended and resumed.

VM status definitions

State	Definition
`Pending`	The VM is accepted by the system and is waiting for allocation.
`Provisioning`	Resources associated with the VM, such as `VirtualMachineDisk`, are being provisioned and prepared.
`Starting`	The VM is being prepared to run.
`Running`	The VM is running.
`Stopping`	The VM is in the process of stopping.
`Stopped`	The VM is stopped and isn't expected to start.
`Paused`	The VM is paused and in a frozen state, which is preserved. The VM cannot be accessed.
`Terminating`	The VM and its associated resources are undergoing the deletion process.
`ErrorConfiguration`	The VM has a configuration error. The invalid configuration states can be caused by the following:
	`MachineTypeNotFound` - VM type the VM refers to is not found or is being deleted.
	`MachineDiskMisconfig` - The VM disk is incorrectly configured.
	`InterfaceCreationFailed` - The network interface creation failed.
`CrashLoopBackOff`	The VM is currently in a crash loop and is waiting to be retried.
`PendingIPAllocation`	The VM is waiting for the system to assign it an IP address.
`Unknown`	The VM state could not be obtained, typically due to an error in communicating with the host on which it's running.
`ErrorUnschedulable`	An error has occurred while scheduling the VM, for example, due to resource requests or scheduling constraints that cannot be satisfied or supported.
`DiskError`	The VM has an error with one or more of the attached disks.
`WaitingForDisk`	The VM is waiting for one or more of the attached `VirtualMachineDisk` to be ready.
`CrashLoopBackoff`	The VM has been consistently crashing for some reason.

Before you begin

To use gdcloud command-line interface (CLI) commands, ensure that you have downloaded, installed, and configured the gdcloud CLI. All commands for GDC air-gapped appliance use the gdcloud or kubectl CLI, and require an operating system (OS) environment.

Get the kubeconfig file path

To run commands against the admin cluster, ensure you have the following resources:

Locate the admin cluster name, or ask your Platform Administrator (PA) what the cluster name is.
Sign in and generate the kubeconfig file for the admin cluster if you don't have one.
Use the path to replace ADMIN_KUBECONFIG in these instructions.

Check VM status

Every VM reports its status as part of the VM's properties. Check a VM's status for any of the following reasons:

If there are issues with the VM.
To confirm the VM is running after it has started.
To verify the VM is in the Paused or Stopped state.

List VMs to check status

The following procedure shows how to list VMs, view their status, and get additional status information.

List all VMs and view the status of each:

kubectl --kubeconfig ADMIN_KUBECONFIG \
    get virtualmachines.virtualmachine.gdc.goog -n PROJECT

Replace the variables in the code examples with your own values according to the following table.

Variable	Definition
`ADMIN_KUBECONFIG`	The admin cluster `kubeconfig` file path.
`PROJECT`	The GDC project in which the VM resides.

Example output:

NAME          STATUS                    AGE
vm-1          Running                    1d
vm-2          Stopped                    8d
vm-3          ErrorConfiguration         1d

Get additional details about a particular VM's status:
```
kubectl  --kubeconfig ADMIN_KUBECONFIG \
    get virtualmachines.virtualmachine.gdc.goog VM_NAME -n PROJECT -o \
    jsonpath='{"State:"}{.status.state}{"\n"}{"Reason:"}{.status.reason}{"\n"}{"Message:"}{.status.message}{"\n"}'
```
Replace the following:
- ADMIN_KUBECONFIG with the kubeconfig file path for the admin cluster you obtained from the gdcloud auth login command.
- VM_NAME with the name of the new VM.
- PROJECT with the GDC project in which the VM resides.
Example output showing Reason and Message values:
```
State: ErrorConfiguration
Reason: MachineDiskNotFound
Message: VirtualMachineDisk disk-1 in namespace project-1 does not exist.
```
You might also get empty fields for Reason and Message. This indicates there was nothing for the system to report regarding them.

Example output with Reason and Message empty:
```
State: Running
Reason:
Message:
```

Stop, or restart a VM

During the VM lifecycle you might need to stop and restart a VM, or delete a VM to respond to a status change or generally manage the VM. See these pages to stop, reset, or delete a VM: