Troubleshooting Google Virtual NIC

Here are some tips to help troubleshoot Google Virtual NIC (gVNIC).

VM instance didn't boot

Cause: gVNIC is not enabled on the image.
Diagnosis: Check that the image has gVNIC enabled. To verify, run the following command:
```
gcloud compute images describe IMAGE_NAME
```
Replace IMAGE_NAME with the name of your image.

The output of the command should show GVNIC under guestOsFeatures.

You can also check if the VM was created with the nic-type set to gVNIC. To do this run the following command:
```
gcloud compute instances describe VM_NAME
```
Replace VM_NAME with the name of your VM.
Resolution: Ensure that you are using a supported image or that you have properly set up the gVNIC driver on your custom image.

Cause: gVNIC was not successfully installed and loaded.
Diagnosis: To check if the driver was installed and loaded, complete the following steps:
Linux
1. Check that the driver is installed.
```
modinfo gve
```
  The output should resemble the following:
```
filename:       /lib/modules/4.15.0-1036-gcp/updates/dkms/gve.ko
version:        1.1.0
license:        Dual MIT/GPL
description:    gVNIC Driver
author:         Google, XXX.
srcversion:     5FEFB9DD945EB2DEC94EE09
alias:          pci:v00001AE0d00000042sv*sd*bc*sc*i*
depends:
retpoline:      Y
name:           gve
vermagic:       4.15.0-1036-gcp SMP mod_unload
```
2. Check that the driver is loaded.
```
lsmod | grep gve
```
  The output should resemble the following:
```
gve                    49152  0
```
Windows
1. Connect to instance through SAC.
2. Login with your username and password.
3. From the command prompt, run the following command:
```
dism /online /get-drivers | findstr gvnic
```
4. Review the result.
  - If the driver is installed, you should see the text Original File Name : gvnic.inf in the output.
  - If the driver is not installed, no message is returned.
Note: You can also review the interactive serial console when debugging issues with your connection.
Resolution: If gVNIC is not available, ensure that you are using a supported image or that you have properly set up gVNIC on your custom image.