➕️ Improve googlecloud support

- add support to provision VMs on googlecloud
- refactor the way we define the project used by Terraform
  (we'll now use the GOOGLE_PROJECT environment variable,
  and if it's not set, we'll set it automatically by getting
  the default project from the gcloud CLI)

prepare-labs/README.md

@@ -66,7 +66,7 @@ Here is where we look for credentials for each provider:
 - Civo: CLI configuration file (`~/.civo.json`)
 - Digital Ocean: CLI configuration file (`~/.config/doctl/config.yaml`)
 - Exoscale: CLI configuration file (`~/.config/exoscale/exoscale.toml`)
-- Google Cloud: FIXME, note that the project name is currently hard-coded to `prepare-tf`
+- Google Cloud: we're using "Application Default Credentials (ADC)"; run `gcloud auth application-default login`; note that we'll use the default "project" set in `gcloud` unless you set the `GOOGLE_PROJECT` environment variable
 - Hetzner: CLI configuration file (`~/.config/hcloud/cli.toml`)
 - Linode: CLI configuration file (`~/.config/linode-cli`)
 - OpenStack: you will need to write a tfvars file (check [that exemple](terraform/virtual-machines/openstack/tfvars.example))

prepare-labs/lib/commands.sh

@@ -270,7 +270,27 @@ _cmd_create() {
 
     ln -s ../../$SETTINGS tags/$TAG/settings.env.orig
     cp $SETTINGS tags/$TAG/settings.env
-    . $SETTINGS
+
+    # For Google Cloud, it is necessary to specify which "project" to use.
+    # Unfortunately, the Terraform provider doesn't seem to have a way
+    # to detect which Google Cloud project you want to use; it has to be
+    # specified one way or another. Let's decide that it should be set with
+    # the GOOGLE_PROJECT env var; and if that var is not set, we'll try to
+    # figure it out from gcloud.
+    # (See https://github.com/hashicorp/terraform-provider-google/issues/10907#issuecomment-1015721600)
+    # Since we need that variable to be set each time we'll call Terraform
+    # (e.g. when destroying the environment), let's save it to the settings.env
+    # file.
+    if [ "$PROVIDER" = "googlecloud" ]; then
+        if ! [ "$GOOGLE_PROJECT" ]; then
+            info "PROVIDER=googlecloud but GOOGLE_PROJECT is not set. Detecting it."
+            GOOGLE_PROJECT=$(gcloud config get project)
+            info "GOOGLE_PROJECT will be set to '$GOOGLE_PROJECT'."
+        fi
+        echo "export GOOGLE_PROJECT=$GOOGLE_PROJECT" >> tags/$TAG/settings.env
+    fi
+
+    . tags/$TAG/settings.env
 
     echo $MODE > tags/$TAG/mode
     echo $PROVIDER > tags/$TAG/provider
@@ -1218,14 +1238,17 @@ fi
     "
 }
 
-_cmd ssh "Open an SSH session to the first node of a tag"
+_cmd ssh "Open an SSH session to a node (first one by default)"
 _cmd_ssh() {
     TAG=$1
     need_tag
-    IP=$(head -1 tags/$TAG/ips.txt)
-    info "Logging into $IP (default password: $USER_PASSWORD)"
-    ssh $SSHOPTS $USER_LOGIN@$IP
-
+    if [ "$2" ]; then
+        ssh -l ubuntu -i tags/$TAG/id_rsa $2
+    else
+        IP=$(head -1 tags/$TAG/ips.txt)
+        info "Logging into $IP (default password: $USER_PASSWORD)"
+        ssh $SSHOPTS $USER_LOGIN@$IP
+    fi
 }
 
 _cmd tags "List groups of VMs known locally"

prepare-labs/lib/pssh.sh

@@ -23,6 +23,14 @@ pssh() {
     # necessary - or down to zero, too.
     sleep ${PSSH_DELAY_PRE-1}
 
+    # When things go wrong, it's convenient to ask pssh to show the output
+    # of the failed command. Let's make that easy with a DEBUG env var.
+    if [ "$DEBUG" ]; then
+        PSSH_I=-i
+    else
+        PSSH_I=""
+    fi
+
     $(which pssh || which parallel-ssh) -h $HOSTFILE -l ubuntu \
         --par ${PSSH_PARALLEL_CONNECTIONS-100} \
         --timeout 300 \
@@ -31,5 +39,6 @@ pssh() {
         -O UserKnownHostsFile=/dev/null \
         -O StrictHostKeyChecking=no \
         -O ForwardAgent=yes \
+        $PSSH_I \
         "$@"
 }

prepare-labs/terraform/one-kubernetes/googlecloud/locals.tf

@@ -1,12 +0,0 @@
-locals {
-  location = var.location != null ? var.location : "europe-north1-a"
-  region   = replace(local.location, "/-[a-z]$/", "")
-  # Unfortunately, the following line doesn't work
-  # (that attribute just returns an empty string)
-  # so we have to hard-code the project name.
-  #project = data.google_client_config._.project
-  project = "prepare-tf"
-}
-
-data "google_client_config" "_" {}
-

prepare-labs/terraform/one-kubernetes/googlecloud/main.tf

@@ -1,7 +1,7 @@
 resource "google_container_cluster" "_" {
-  name     = var.cluster_name
-  project  = local.project
-  location = local.location
+  name                = var.cluster_name
+  location            = local.location
+  deletion_protection = false
   #min_master_version = var.k8s_version
 
   # To deploy private clusters, uncomment the section below,
@@ -42,7 +42,7 @@ resource "google_container_cluster" "_" {
   node_pool {
     name = "x86"
     node_config {
-      tags         = var.common_tags
+      tags         = ["lab-${var.cluster_name}"]
       machine_type = local.node_size
     }
     initial_node_count = var.min_nodes_per_pool
@@ -62,3 +62,25 @@ resource "google_container_cluster" "_" {
     }
   }
 }
+
+resource "google_compute_firewall" "_" {
+  name    = "lab-${var.cluster_name}"
+  network = "default"
+
+  allow {
+    protocol = "tcp"
+    ports    = ["0-65535"]
+  }
+
+  allow {
+    protocol = "udp"
+    ports    = ["0-65535"]
+  }
+
+  allow {
+    protocol = "icmp"
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+  target_tags   = ["lab-${var.cluster_name}"]
+}

prepare-labs/terraform/one-kubernetes/googlecloud/outputs.tf

@@ -6,6 +6,8 @@ output "has_metrics_server" {
   value = true
 }
 
+data "google_client_config" "_" {}
+
 output "kubeconfig" {
   sensitive = true
   value     = <<-EOT

prepare-labs/terraform/one-kubernetes/googlecloud/provider.tf

@@ -1,8 +0,0 @@
-terraform {
-  required_providers {
-    google = {
-      source  = "hashicorp/google"
-      version = "4.5.0"
-    }
-  }
-}

prepare-labs/terraform/one-kubernetes/googlecloud/provider.tf

@@ -0,0 +1 @@
+../../providers/googlecloud/provider.tf

prepare-labs/terraform/providers/googlecloud/provider.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 7.0"
+    }
+  }
+}

prepare-labs/terraform/providers/googlecloud/variables.tf

@@ -9,5 +9,9 @@ variable "node_sizes" {
 
 variable "location" {
   type    = string
-  default = null
+  default = "europe-north1-a"
 }
+
+locals {
+  location = (var.location != "" && var.location != null) ? var.location : "europe-north1-a"
+}

prepare-labs/terraform/virtual-machines/googlecloud/common.tf

@@ -0,0 +1 @@
+../common.tf

prepare-labs/terraform/virtual-machines/googlecloud/config.tf

@@ -0,0 +1 @@
+../../providers/googlecloud/config.tf

prepare-labs/terraform/virtual-machines/googlecloud/main.tf

@@ -0,0 +1,54 @@
+# Note: names and tags on GCP have to match a specific regex:
+# (?:[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?)
+# In other words, they must start with a letter; and generally,
+# we make them start with a number (year-month-day-etc, so 2025-...)
+# so we prefix names and tags with "lab-" in this configuration.
+
+resource "google_compute_instance" "_" {
+  for_each     = local.nodes
+  zone         = var.location
+  name         = "lab-${each.value.node_name}"
+  tags         = ["lab-${var.tag}"]
+  machine_type = each.value.node_size
+  boot_disk {
+    initialize_params {
+      image = "ubuntu-os-cloud/ubuntu-2404-lts-amd64"
+    }
+  }
+  network_interface {
+    network = "default"
+    access_config {}
+  }
+  metadata = {
+    "ssh-keys" = "ubuntu:${tls_private_key.ssh.public_key_openssh}"
+  }
+}
+
+locals {
+  ip_addresses = {
+    for key, value in local.nodes :
+    key => google_compute_instance._[key].network_interface[0].access_config[0].nat_ip
+  }
+}
+
+resource "google_compute_firewall" "_" {
+  name    = "lab-${var.tag}"
+  network = "default"
+
+  allow {
+    protocol = "tcp"
+    ports    = ["0-65535"]
+  }
+
+  allow {
+    protocol = "udp"
+    ports    = ["0-65535"]
+  }
+
+  allow {
+    protocol = "icmp"
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+  target_tags   = ["lab-${var.tag}"]
+}

prepare-labs/terraform/virtual-machines/googlecloud/provider.tf

@@ -0,0 +1 @@
+../../providers/googlecloud/provider.tf

prepare-labs/terraform/virtual-machines/googlecloud/variables.tf

@@ -0,0 +1 @@
+../../providers/googlecloud/variables.tf