# 02 - Configuring the Cluster (or Nodes)

Configurations are segmented per project/customer using isolated Ansible inventories. **Best Practice:** One customer (or one logical cluster) equals one inventory folder. Do not attempt to define multiple clusters within a single inventory to prevent cross-contamination (the "Blast Radius").

## 1. Create the Environment
Copy the template directory for your specific project:

```bash
cp -r inventories/_template inventories/<customer_name>
mv inventories/<customer_name>/hosts.yml.example inventories/<customer_name>/hosts.yml
mv inventories/<customer_name>/group_vars/all.yml.example inventories/<customer_name>/group_vars/all.yml
```

## 2. Configure `hosts.yml` (Topology & Licensing)
Define the target PVE nodes. Ansible defaults to the `ansible_host` IP for Corosync/DRBD. If a dedicated backend network is available, define `priv_ip`.

**Licensing:** Proxmox licenses are socket/node-specific. Insert the `pve_enterprise_key` directly under each host. If a node lacks a key, omit the variable entirely; Ansible will fall back to the `pve-no-subscription` repository automatically for that specific node.

```yaml
all:
  children:
    proxmox:
      hosts:
        pve-node-01:
          ansible_host: 192.168.1.11
          priv_ip: 10.0.0.11
          pve_enterprise_key: "pve1c-111111111111"
        pve-node-02:
          ansible_host: 192.168.1.12
          priv_ip: 10.0.0.12
          # Omitted key: This node will use no-subscription
```

## 3. Configure `group_vars/all.yml`

* **Deployment Toggles:**
  * `deploy_linstor: true` (Provisions HCI/DRBD stack)
  * `standalone_mode: false` (Set to `true` if you are provisioning independent, unclustered servers).
* **HA Controller:** Define `ha_pool`, `ha_vip` (Virtual IP), and the CIDR prefix for the Linstor DB promoter.
* **Storage Pools:** 
  * If mapping a raw disk (`/dev/sda`), the playbook invokes `community.general.lvg` to create the VG/Thin Pool.
  * If mapping an existing path (`pve/data`), LVM tasks are skipped, and the target is registered directly in Linstor.