Google compute engine API:backendError(503) - google-api

Question

I am having trouble figuring out the problem with the API hit to create a Google virtual machine through Google Compute Engine API.
URL: https://cloud.google.com/compute/docs/reference/latest/instances/insert?apix=true#examples
My request data is:
{
"machineType": "zones/us-central1-c/machineTypes/f1-micro",
"name": "api-test",
"networkInterfaces": [
{
"accessConfigs": [
{
"type": "ONE_TO_ONE_NAT",
"name": "External NAT"
}
],
"network": "global/networks/default"
}
],
"disks": [
{
"boot": true,
"autoDelete": true,
"type": "SCRATCH"
}
]
}
and I am getting output:
{
"error": {
"errors": [
{
"domain": "global",
"reason": "backendError",
"message": "Code: '55C355EC47648.A8E5D85.FA0DAF10'"
}
],
"code": 503,
"message": "Code: '55C355EC47648.A8E5D85.FA0DAF10'"
}
}
Doesn't give me any reason for the error. Same issue is when I hit the API using Ruby Library. Authentication is fine as I can do various other stuff like getting the images and running instances data. Please help me out.

Answer 1

Figured out the problem. We have to use the disks type as "PERSISTENT" rather than "SCRATCH" and specify the disks["initializeParams"]["sourceImage"] as an existing image from https://console.cloud.google.com/compute/images and then use it like this in the request body of your request:
{
"name": "api-test3",
"machineType": "zones/us-central1-c/machineTypes/f1-micro",
"networkInterfaces": [
{
"accessConfigs": [
{
"type": "ONE_TO_ONE_NAT",
"name": "External NAT"
}
],
"network": "global/networks/default"
}
],
"disks": [
{
"boot": "true",
"type": "PERSISTENT",
"autoDelete": "true",
"initializeParams": [
{
"sourceImage": "global/images/ubuntu-1404-lts"
}
]
}
]
}