Using GCP

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This is a step-by-step guide to deploy an Aptos validator and validator fullnode (VFN) using Google Cloud Platform Services (GCP). Using this guide, the validator and VFN will be deployed on separate machines.

Deployment steps

Create a working directory for your Aptos nodes, and pick a username for your nodes, e.g.,
Terminal window
```
export WORKSPACE=mainnet
export USERNAME=alice
mkdir ~/$WORKSPACE
cd ~/$WORKSPACE
```
Create a storage bucket for storing the Terraform state on Google Cloud Storage.

Storage bucket name
The name of the Google Cloud storage bucket must be unique. See the Google Cloud Storage documentation, here.

Use the GCP UI or Google Cloud Storage command to create the bucket:
Terminal window
```
gsutil mb gs://BUCKET_NAME

# Here's an example of creating a bucket
gsutil mb gs://<project-name>-aptos-terraform-dev
```
Create a Terraform file called main.tf in your working directory:
Terminal window
```
cd ~/$WORKSPACE
vi main.tf
```

Modify the main.tf file to configure Terraform and create the Terraform module. See the example below:

terraform {
  required_version = "~> 1.3.6"
  backend "gcs" {
    bucket = "BUCKET_NAME" # The bucket name created above
    prefix = "state/aptos-node"
  }
}

module "aptos-node" {
  # Download the Terraform module from the aptos-core repository.
  source        = "github.com/aptos-labs/aptos-core.git//terraform/aptos-node/gcp"
  region        = "us-central1"  # Specify the GCP region
  zone          = "c"            # Specify the zone suffix
  project       = "<GCP Project ID>" # Specify your GCP project ID
  era           = 1  # Bump the era number to wipe the chain data
  chain_id      = 1  # Use 1 for mainnet, or different values for other networks.
  image_tag     = "mainnet" # Specify the image tag to use based on the network
  validator_name = "<Name of your validator>" # Specify the name of your validator
}

For all customization options, see:

The Terraform variables: https://github.com/aptos-labs/aptos-core/blob/main/terraform/aptos-node/gcp/variables.tf
The Helm values: https://github.com/aptos-labs/aptos-core/blob/main/terraform/helm/aptos-node/values.yaml.

Initialize Terraform in the $WORKSPACE directory where you created the main.tf file.
Terminal window
```
terraform init
```
This will download all the Terraform dependencies into the .terraform folder in your current working directory.
Create a new Terraform workspace to isolate your environments, and see the list of workspaces.
Terminal window
```
terraform workspace new $WORKSPACE

# This command will list all workspaces
terraform workspace list
```
Apply the Terraform configuration.
Terminal window
```
terraform apply
```
This may take a while to finish (e.g., >20 minutes). Terraform will create all the resources on your cloud account.
After terraform apply finishes, you can check if the resources have been created correctly, by running the following commands:
- gcloud container clusters get-credentials aptos-$WORKSPACE --zone <region/zone> --project <project>: This command will configure access for your k8s cluster.
- kubectl get pods: This command will output all pods in the cluster. You should see haproxy, the validator and the VFN (with the validator and VFN pod pending due to further action in later steps).
- kubectl get svc: This command will output all services in the cluster. You should see the validator-lb and fullnode-lb, with an external IP for network connectivity.

Next, we need to inject your node’s IP information into your environment. You can do this by running the following commands:

export VALIDATOR_ADDRESS="$(kubectl get svc ${WORKSPACE}-aptos-node-0-validator-lb --output jsonpath='{.status.loadBalancer.ingress[0].hostname}')"

export FULLNODE_ADDRESS="$(kubectl get svc ${WORKSPACE}-aptos-node-0-fullnode-lb --output jsonpath='{.status.loadBalancer.ingress[0].hostname}')"

Now, generate the key pairs for your nodes in your working directory. You can do this by running the following command with the Aptos CLI:
Terminal window
```
aptos genesis generate-keys --output-dir ~/$WORKSPACE/keys
```
This will create 4 key files under ~/$WORKSPACE/keys directory:
- public-keys.yaml: This file contains all public keys for your validator and VFN, as well as your account address.
- private-keys.yaml: This file contains all private keys for your validator and VFN.
- validator-identity.yaml: This file contains the public and private keys for your validator, as well as your account address.
- validator-full-node-identity.yaml: This file contains the public and private keys for your VFN, as well as your account address.
Backup your private keys
Your private keys are important for you to establish ownership of your nodes. Never share your private keys with anyone, and make sure to backup private-keys.yaml somewhere safe.
Next, you will need to set your validator configuration. This includes setting the validator and VFN host names, which may be IP addresses or DNS addresses. This can be done by running the following command:
Terminal window
```
aptos genesis set-validator-configuration \
  --local-repository-dir ~/$WORKSPACE \
  --username $USERNAME \
  --owner-public-identity-file ~/$WORKSPACE/keys/public-keys.yaml \
  --validator-host $VALIDATOR_ADDRESS:6180 \
  --full-node-host $FULLNODE_ADDRESS:6182 \
  --stake-amount 100000000000000
```
Configuring the validator will create two YAML files in the ~/$WORKSPACE/$USERNAME directory: owner.yaml and operator.yaml. These will be useful for connecting your nodes to the Aptos network (later).
Download the following files by following the instructions on the Node Files pages. You will need to select the appropriate network (e.g., mainnet, testnet, devnet) and download the following files:
- genesis.blob
- waypoint.txt
To recap, in your working directory (~/$WORKSPACE), you should have a list of files:
- main.tf: The Terraform files to install the aptos-node module.
- keys folder containing:
  - public-keys.yaml: Public keys for both nodes.
  - private-keys.yaml: Private keys for both nodes.
  - validator-identity.yaml: Key and account information for the validator.
  - validator-full-node-identity.yaml: Key and account information for the VFN.
- $username folder containing:
  - owner.yaml: The owner, operator and voter mappings.
  - operator.yaml: Validator and VFN operator information.
- waypoint.txt: The waypoint for the genesis transaction on the network you are connecting to.
- genesis.blob The genesis blob for the network you are connecting to.
Finally, insert the genesis.blob, waypoint.txt and the identity files as secrets into the k8s cluster, by running the following command:
Terminal window
```
kubectl create secret generic ${WORKSPACE}-aptos-node-0-genesis-e1 \
    --from-file=genesis.blob=genesis.blob \
    --from-file=waypoint.txt=waypoint.txt \
    --from-file=validator-identity.yaml=keys/validator-identity.yaml \
    --from-file=validator-full-node-identity.yaml=keys/validator-full-node-identity.yaml
```
Era numbers and dangling volumes
The -e1 suffix in the command above refers to the era number. If you changed the era number, make sure it matches when creating the secrets.
The era is a concept relevant only to Kubernetes deployments of an Aptos node. Changing the era provides an easy way to wipe your deployment’s state (e.g., blockchain data). However, this may lead to dangling persistent volumes. Confirm the existence of any dangling volumes with kubectl get pvc and delete any dangling volumes manually to minimize costs.

Now, we should be able to see that all pods are running, including the validator and VFN. You can check this by executing the following command:

kubectl get pods

# Example output
NAME                                        READY   STATUS    RESTARTS   AGE
node1-aptos-node-0-fullnode-e9-0              1/1     Running   0          4h31m
node1-aptos-node-0-haproxy-7cc4c5f74c-l4l6n   1/1     Running   0          4h40m
node1-aptos-node-0-validator-0                1/1     Running   0          4h30m

Connecting to the Aptos Network

You have now completed setting up your validator and VFN using GCP. Proceed to Connect Nodes for the next steps.