# 🚀 Provisioning Servers with railiance-infra

This guide explains how adopted hosts and provider-managed Hetzner hosts share
an inventory without sharing lifecycle behavior.

---

## 🚀 Fast Path: Using the Helper Script

Instead of manually editing `inventory/servers.yaml` and running `make tf-apply`, you can use the convenience script [`scripts/hcloud_new_server.sh`](../scripts/hcloud_new_server.sh).  
This script will:

1. Add the new host entry to `inventory/servers.yaml`
2. Decrypt your Hetzner API token with SOPS
3. Run Terraform init and plan
4. Apply only when the operator supplies the explicit `--apply` flag after
   reviewing the plan

**Example:**

```bash
scripts/hcloud_new_server.sh core-01 --type cpx11 --region nbg1 --role core
# after review and the required approval:
scripts/hcloud_new_server.sh core-01 --type cpx11 --region nbg1 --role core --apply
```

This will create a small cpx11 instance in the Nuremberg (nbg1) region, tagged with the role core.
You can then connect directly:

```bash
ssh admin@<printed-ip>
```

👉 The script is optional. You can always manage servers by editing inventory/servers.yaml and running make tf-apply instead.



## 1) Where you define servers

All host identities live in **`inventory/servers.yaml`**. Run
`make validate-inventory` before Terraform or Ansible. Adopted hosts have a
provider address but no `provisioning` block. Provider-managed Hetzner hosts
have no committed IP and use this shape:

```yaml
servers:
  - name: core-01
    provider: hetzner
    lifecycle_mode: provider-managed
    ssh_user: admin
    baseline_profile: ufw-managed
    provisioning:
      server_type: cpx21
      region: nbg1
      image: ubuntu-24.04
      role: core
      labels: [core, wireguard, git]
```

> Tip: Keep **names stable**. Renaming a server in this file makes Terraform think the old one was destroyed and a new one should be created.

---

## 2) Two ways to add a server

### A) Edit YAML by hand (simple)
Open `inventory/servers.yaml`, add a new entry, save, commit.

### B) Use the helper script (safe & quick)
```bash
# requires scripts/new_host.py
make new-host NAME=web-01 TYPE=cpx21 REGION=nbg1 ROLE=web
# or directly:
python3 scripts/new_host.py --name web-01 --type cpx21 --region nbg1 --role web
```

You can also do **add + provision in one step**:
```bash
scripts/hcloud_new_server.sh web-01 --type cpx21 --region nbg1 --role web
```

---

## 3) How Terraform uses your declaration

The module at `terraform/hetzner/`:
- Selects only records with `provider: hetzner` and
  `lifecycle_mode: provider-managed`
- Registers your SSH key from `keys/admin_ssh.pub`
- Injects **cloud-init** that sets up the `admin` user and basic hardening
- Creates/updates/destroys servers to match the YAML

Outputs include a map of server names → IPv4 addresses.

---

## 4) Provision (create/update)

The Hetzner API token is **SOPS-decryptable** at
`secrets/hetzner-token.yaml`, field `hetzner.token`. It is decrypted only into
the invoking process environment.

Then run either:
```bash
# plan and apply in separate steps
make tf-plan
APPROVE_TF_APPLY=YES make tf-apply
```
or the end-to-end convenience:
```bash
APPROVE_TF_APPLY=YES make apply    # terraform apply + Ansible bootstrap
```

If you used the one-shot script:
```bash
scripts/hcloud_new_server.sh web-01 --type cpx21 --region nbg1 --role web
```

Terraform will print the new servers’ IPv4 addresses at the end.

---

## 5) Connect & converge

Connect via SSH:
```bash
ssh admin@<server-ip>
```

Run Ansible base bootstrap (if not using `make apply`):
```bash
make ansible-bootstrap
```

---

## 6) Destroy (tear down)

To remove all servers managed by this repo:
```bash
APPROVE_TF_DESTROY=DESTROY-MANAGED-HETZNER make tf-destroy
```

To remove one **provider-managed Hetzner** server, delete its entry from
`inventory/servers.yaml`, review the plan, obtain the required approval, then:
```bash
APPROVE_TF_APPLY=YES make tf-apply
```
Terraform will destroy the missing managed Hetzner server and leave others
intact. Adopted Host Europe records are never Terraform resources.

---

## 7) Notes & conventions

- **Idempotent:** You can run `make apply` repeatedly; Terraform converges infra, Ansible converges config.
- **SSH keys:** Ensure `keys/admin_ssh.pub` exists before provisioning.
- **Secret token:** The Hetzner API token is `secrets/hetzner-token.yaml`, field
  `hetzner.token`, and must remain SOPS-encrypted.
- **Cloud-init delay:** Allow ~30–60s after creation for first-boot tasks before first SSH.
- **Labels & role:** `labels` are freeform tags; `role` can drive Ansible plays as you grow.