k8s-starter-pack/docs/network.md

# Network map

Every real IP address this cluster hands out, and exactly what's reachable
there. This file isn't a template with the rest of the repo — it's a log
of *your* actual setup, meant to be updated every time an address is
assigned or changed, so you (or Claude) never have to reverse-engineer
"wait, what's running on .241 again?" from `kubectl` output.

> **Keep this current.** If you're working with Claude and an IP changes —
> a new app gets a `LoadBalancer` address, the MetalLB pool is resized,
> Argo CD's address changes — ask it to update this file, or just point it
> here after any networking change. See `CLAUDE.md` for the standing
> instruction that tells Claude to do this on its own when it makes such a
> change itself.

## The five nodes and the VIP

None of these are from the MetalLB pool below — they're the machines
themselves and the shared address Talos elects between the three control-plane
nodes. Set in [`talos/README.md`](../talos/README.md); see
[`docs/02-talos-bootstrap.md`](02-talos-bootstrap.md) for what the VIP is
and why it's separate from any one node's address. Port 6443 is the Kubernetes
API on control-plane nodes; port 50000 is Talos's TLS-protected management API
on every node.

| Address | What | Port(s) | URL(s) |
|---|---|---|---|
| `10.10.10.200` | `talos-455-i3b` — control plane (Raspberry Pi 4) | 6443, 50000 | `https://10.10.10.200:6443`, `https://10.10.10.200:50000` |
| `10.10.10.201` | `talos-9xy-iuk` — control plane (Raspberry Pi 4) | 6443, 50000 | `https://10.10.10.201:6443`, `https://10.10.10.201:50000` |
| `10.10.10.202` | `talos-k1b-7j5` — control plane (Raspberry Pi 4) | 6443, 50000 | `https://10.10.10.202:6443`, `https://10.10.10.202:50000` |
| `10.10.10.203` | `talos-rss-v5l` — worker01 (Proxmox VM on Gimli) | 50000 | `https://10.10.10.203:50000` |
| `10.10.10.204` | `talos-vba-ood` — worker02 (Proxmox VM on Titus) | 50000 | `https://10.10.10.204:50000` |
| `10.10.10.210` | Cluster VIP (use this one, not a node's own address) | 6443 | `https://10.10.10.210:6443` |

## MetalLB pool

This dedicated service range is advertised to the MikroTik at
`10.10.10.1` with BGP by the two workers; it is not an L2 or DHCP pool.

| | |
|---|---|
| Range | `10.10.60.10-10.10.60.250` |
| Router / ASN | MikroTik RB5009 `10.10.10.1` / `64512` |
| Worker ASN | `64520` |
| Configured in | [`apps/metallb/templates/`](../apps/metallb/templates/) |

## Allocated addresses (from the MetalLB pool)

| Address | What | Namespace | Port(s) | URL | Source |
|---|---|---|---|---|---|
| `10.10.60.10` | Argo CD UI/API (`argocd-server`) | `argocd` | 443 | `https://10.10.60.10` | Patched to `LoadBalancer` by hand — see [`docs/05-metallb.md`](05-metallb.md) |
| `10.10.60.12` | ingress-nginx (shared, routes by hostname) | `ingress-nginx` | 80, 443 | `http://10.10.60.12`, `https://10.10.60.12` | [`apps/ingress-nginx/values.yaml`](../apps/ingress-nginx/values.yaml) — see [`docs/11-ingress.md`](11-ingress.md) |

Add a row here every time you add a new app with its own dedicated
`LoadBalancer` Service (see [`docs/08-adding-new-apps.md`](08-adding-new-apps.md)).
Most apps should route through ingress-nginx by hostname instead — see the
table below — and only need a dedicated address if they can't speak HTTP
(a raw TCP service, for example). Leave the URL column's port number off
only when it's the protocol default (80 for `http://`, 443 for `https://`)
— include it otherwise.

## Hostnames routed through ingress-nginx

Every real DNS record pointing at ingress-nginx's shared address
(`10.10.60.12`), and which app it reaches. All hosted on Cloudflare.

| Hostname | App | Namespace | TLS | Source |
|---|---|---|---|---|
| `demo.ahmza.com` | Demo app | `demo` | Yes — `letsencrypt-prod`, real trusted cert (see [`docs/12-cert-manager.md`](12-cert-manager.md)) | [`apps/demo/ingress.yaml`](../apps/demo/ingress.yaml) |

Add a row here every time you point a new hostname at this cluster (see
[`docs/11-ingress.md`](11-ingress.md)). The DNS record itself lives in
Cloudflare, not in this repo — this table is just the log of what's real.

## Free in the pool

Addresses from the range above that aren't spoken for yet. Update this
alongside the table above so it's obvious at a glance what's safe to hand
to the next app.

- `10.10.60.11`, `10.10.60.13-10.10.60.250`

(`whoami`'s former `10.10.60.12` was reclaimed here after that app was
removed as the docs/08 exercise — it now belongs to ingress-nginx instead.
`demo`'s former `10.10.60.11` was reclaimed the same way after that app
moved to routing through ingress-nginx by hostname instead — see
docs/11-ingress.md.)