やりたいことを gcloud SDK で確認

% gcloud compute instances create \
    --project otiai10-sandbox \
    --zone asia-northeast1-a \
    testetst

% gcloud compute instances list \
    --project otiai10-sandbox \
    --filter zone:asia-northeast1-a

Go GCP Client でだいたい同じことやる

これです

github.com

以下全文

package main

import (
    "context"
    "flag"
    "fmt"
    "log"
    "time"

    "google.golang.org/api/googleapi"

    "github.com/otiai10/debug"
    "golang.org/x/oauth2/google"
    compute "google.golang.org/api/compute/v1"
)

var (
    project string
    zone    string
    name    string
)

func init() {
    flag.StringVar(&project, "project", "otiai10-sandbox", "Project name on GCP")
    flag.StringVar(&zone, "zone", "asia-northeast1-a", "Zone of GCP")
    flag.StringVar(&name, "name", "test-instance", "Instance name to create")
    flag.Parse()
}

func main() {

    ctx := context.Background()
    client, err := google.DefaultClient(ctx, compute.ComputeScope)
    if err != nil {
        debug.Fatalln(err)
    }

    service, err := compute.New(client)
    if err != nil {
        debug.Fatalln(err)
    }

    // Read
    instance, err := service.Instances.Get(project, zone, name).Do()

    if err == nil && instance != nil {
        // Delete
        log.Printf("Instance found, trying to delete.")
        _, err := service.Instances.Delete(project, zone, name).Do()
        if err != nil {
            debug.Fatalln(err)
        }
        for count := 0; ; count++ {
            fmt.Print(".")
            _, err := service.Instances.Get(project, zone, name).Do()
            if apierror, ok := err.(*googleapi.Error); ok && apierror.Code == 404 {
                fmt.Print("\n")
                break
            }
            time.Sleep(2 * time.Second)
            if count > 15 {
                debug.Fatalln("Couldn't wait for instance deletion ;(")
            }
        }
        log.Printf("Deleted: %v", name)
    } else if apierror, ok := err.(*googleapi.Error); !ok || apierror.Code != 404 {
        debug.Fatalln(err)
    }

    // Create
    instance = &compute.Instance{
        Description: "This is test",
        Name:        name,
        MachineType: fmt.Sprintf("zones/%s/machineTypes/n1-standard-1", zone),
        NetworkInterfaces: []*compute.NetworkInterface{
            &compute.NetworkInterface{
                Network: fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/global/networks/default", project),
            },
        },
        Disks: []*compute.AttachedDisk{
            &compute.AttachedDisk{
                AutoDelete: true,
                Boot:       true,
                Type:       "PERSISTENT",
                InitializeParams: &compute.AttachedDiskInitializeParams{
                    SourceImage: "projects/debian-cloud/global/images/debian-9-stretch-v20180806",
                    DiskSizeGb:  10,
                },
            },
        },
    }
    _, err = service.Instances.Insert(project, zone, instance).Do()
    if err != nil {
        debug.Fatalln(err)
    }

    log.Println("Created:", instance.Name)
}