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GCP Terraform Second Drive

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How to add a second drive on GCP Compute Engine using Terraform.

provider "google" {
  project = "your-project-id"
  zone    = "us-central1-c"
}
 
resource "google_compute_disk" "data-drive" {
  name = "data-drive"
  type = "pd-standard"
  zone = "us-central1-c"
  size = "20"
}
 
resource "google_compute_attached_disk" "attach-data-drive" {
  count    = 1
  disk     = google_compute_disk.data-drive.id
  instance = google_compute_instance.test.id
}
 
resource "google_compute_instance" "test" {
  name         = "test"
  machine_type = "e2-micro"
 
  boot_disk {
    initialize_params {
      image = "rocky-linux-cloud/rocky-linux-8"
    }
  }
 
  scheduling {
    preemptible       = true
    automatic_restart = false
  }
  network_interface {
    network = "default"
    access_config {
    }
  }
}

GCP Spot VM

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Spot VMs are preemtible, they can be reclaimed by the Cloud provider.

However you can get deep discounts using them.

Launch a spot instance in GCP using Terraform.

provider "google" {
  project = "airy-totality-151318"
  zone    = "us-central1-c"
}
 
resource "google_compute_instance" "test" {
  name         = "test"
  machine_type = "e2-micro"
 
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
 
  scheduling {
    preemptible       = true
    automatic_restart = false
  }
 
  network_interface {
    network = "default"
    access_config {
    }
  }
}

GCP Rename VM

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There’s a new beta command to rename a GCP VM.

You must stop instance first.

gcloud compute instances stop server-name \
--zone us-central1-c \
--project your-project-id

Rename the instance.

gcloud beta compute instances set-name old-server-name \
--new-name=new-server-name \
--zone us-central1-c \
--project your-project-id

Start the instance.

gcloud compute instances start server-name \
--zone us-central1-c \
--project your-project-id

Login.

gcloud compute ssh server-name \
--zone us-central1-c \
--project your-project-id \
--internal-ip &

GCP Keep Disk

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Keep your disks when a VM is deleted.

gcloud compute instances set-disk-auto-delete server --no-auto-delete --disk=server-disk-1
gcloud compute instances set-disk-auto-delete server --no-auto-delete --disk=server-disk-2

To delete.

gcloud compute instances set-disk-auto-delete server --auto-delete --disk=server-disk-1
gcloud compute instances set-disk-auto-delete server --auto-delete --disk=server-disk-2

AWS CloudShell

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AWS just added a new feature called CloudShell. It will give users who are logged in to the AWS console access to a VM where users can run AWS CLI commands. Permissions to AWS resources is based on the user’s permissions which are managed via IAM. CloudShell is similar to the cloud shells that Azure and GCP already offer. Here’s a snapshot of AWS CloudShell.

GCP Web Server

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Here’s a quick script to stand up a web server based on Centos image.

gcloud compute instances create [VM-NAME] \
    --zone=[ZONE] \
    --image-family=debian-9 \
    --image-project=debian-cloud \
    --tags=allow-ssh,allow-health-check \
    --subnet=lb-subnet \
    --metadata=startup-script='#! /bin/bash
apt-get update
apt-get install apache2 -y
a2ensite default-ssl
a2enmod ssl
vm_hostname="$(curl -H "Metadata-Flavor:Google" \
http://169.254.169.254/computeMetadata/v1/instance/name)"
echo "Page served from: $vm_hostname" | \
tee /var/www/html/index.html
systemctl restart apache2'

Migrate GCP VM to another network

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Here are the steps how to migrate a GCP VM from one network to another. It involves recreating the instance in that network.

  1. Find the VM. Click the ‘Create Similar’ button.
  2. Select the new network. Save Network. Everything else should stay the same.
  3. Don’t click Create, but get the ‘Create Similar’ command line script only. Click Cancel after.
  4. Make sure to edit the hostname. GCP appends a ‘-1’ at the end of hostname.
  5. Edit VM to keep all disks. Delete VM. Make sure to preserve boot drive.
  6. Run the ‘Create Similar’ command line script you capture to create new VM in the new network.
  7. The new VM will be based on golden image.
  8. Stop VM. Swap new disks with old disks.
  9. Start VM.
  10. Done.