# Plan: Configure Template2 to Use Nix Cache

## Problem

New VMs bootstrapped from template2 don't use our local nix cache (nix-cache.home.2rjus.net) during the initial `nixos-rebuild boot`. This means the first build downloads everything from cache.nixos.org, which is slower and uses more bandwidth.

## Solution

Update the template2 base image to include the nix cache configuration, so new VMs immediately benefit from cached builds during bootstrap.

## Implementation

1. Add nix cache configuration to `hosts/template2/configuration.nix`:
   ```nix
   nix.settings = {
     substituters = [ "https://nix-cache.home.2rjus.net" "https://cache.nixos.org" ];
     trusted-public-keys = [
       "nix-cache.home.2rjus.net:..."  # Add the cache's public key
       "cache.nixos.org-1:..."
     ];
   };
   ```

2. Rebuild and redeploy the Proxmox template:
   ```bash
   nix develop -c ansible-playbook -i playbooks/inventory.ini playbooks/build-and-deploy-template.yml
   ```

3. Update `default_template_name` in `terraform/variables.tf` if the template name changed

## Benefits

- Faster VM bootstrap times
- Reduced bandwidth to external cache
- Most derivations will already be cached from other hosts