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bitcoin-gcp-k8s

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Terraform for deploying Bitcoin full node on GCP kubernetes cluster

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# Bitcoin Full Node on GCP Kubernetes Cluster

There are [many reasons](https://blog.keys.casa/why-run-a-node/) to
run a Bitcoin full node. Running it in the cloud has a few extra
benefits:

- A fully indexed Bitcoin full node can take up to 300Gi disk space
  and non-trivial amount of CPU and memory, which is quite a bit for an
  everyday laptop which is also used for other purposes.
- A cloud based Bitcoin full node can be accessed from anywhere
  through multiple devices, using standard tooling such as
  [gcloud](https://cloud.google.com/sdk/gcloud/) and
  [kubectl](https://kubernetes.io/docs/reference/kubectl/overview/).
- If you want to develop or test a Bitcoin application, it is easy to point
  local development environment to the Bitcoin full node through [port
  forwarding](https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/)
  and then smoothly deploy it to the cloud later.

Code contained this repository helps to run a Bitcoin full node in
[Google Cloud Platform](https://cloud.google.com/) using [Kubernetes
Engine](https://cloud.google.com/kubernetes-engine/). It can be used
as a starting point to build and deploy Bitcoin powered applications.

## Prerequisit

* [Terraform](https://www.terraform.io/) (>0.13)
* [Google Cloud SDK](https://cloud.google.com/sdk/)

## Setup

1. If you have not setup GCP for your google account already, you can
   try to set it up [here](https://cloud.google.com/gcp/). For new
   users, Google offers 300 USD credits. To start the trial, Google
   requires registration of payment method. According to the [terms
   and conditions](https://cloud.google.com/terms/free-trial/) for GCP
   free trial, mining cryptocurrency is not allowed, but running a
   full node is *not* mining.
2. After GCP is setup, you can find your billing account id
   [here](https://console.cloud.google.com/billing)
3. Bitcoind RPC requires basic authentication. Use
   [rpcauth.py](rpcauth.py) to generate the `rpcauth` value, as shown below:
   
```
$ ./rpcauth.py username password
String to be appended to bitcoin.conf:
rpcauth=username:6436a49a71eabc219d79c38980be0a54$7bc37525a942213ee5ac1ae8cf7f802616b96bf2dd01a1e0121629be86c5d425
```

4. Go into terraform directory, run

```
terraform init
terraform plan -var 'project_id=YOUR_PROJECT_ID' \
               -var 'project_billing_account=YOUR_BILLING_ACCOUNT_ID_FROM_STEP_2' \
               -var 'bitcoin_rpcauth=YOUR_RPCAUTH_CREATED_FROM_STEP_3' \
               -out plan.out
               
## Confirm the output and then run
terraform apply "plan.out"
```

By default, machine type `e2-standard-2` is used, you can change it to
something else using `kubernetes_node_pool_machine_type`
variable. Similiarly, `project_name`, `region`, `zone` and
`bitcoin_version` can be configured as well through terraform
variables.

If everything is executed successfully, a Bitcoin node should be
running in the `bitcoin` namespace in the kubernetes cluster.

## Usage

If you want to access the Bitcoin full node locally, you need to have simply run the
following command:

```
kubectl port-forward svc/bitcoind 8332
```
Then you can interact with the bitcoind as if it is running locally on
your machine

```
$ bitcoin-cli getrawtransaction e13d407be6085f1d0a0513f47577340f41f45d0b7250f3c554e8e05590113d7a true
  "txid": "e13d407be6085f1d0a0513f47577340f41f45d0b7250f3c554e8e05590113d7a",
  "hash": "7871c106d47a4d45784d427d990adc7e221aa6fade5d3c0bf39314812cea9ee6",
  "version": 1,
  "size": 371,
  "vsize": 206,
  "weight": 821,
  "locktime": 0,
  "vin": [
    {

....
```

## Cost

## Issues

If you see something like this after you run `terraform apply`

```
Error: googleapi: Error 403: Kubernetes Engine API is not enabled for this project. Please ensure it is enabled in Google Cloud Console and try again: visit https://console.cloud.google.com/apis/api/container.googleapis.com/overview?projec
t=YOUR_PROJECT_ID to do so., forbidden
```

You maybe need to run the following command to enable it.

```
gcloud services enable container.googleapis.com --project=YOUR_PROJECT_ID
```

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