Add newt playbook

playbooks/newt.md

@@ -0,0 +1,75 @@
+# Newt (Pangolin Tunnel Agent) Playbook
+
+## Overview
+
+`newt.yml` deploys [Newt](https://github.com/fosrl/newt), the tunnel agent for the Pangolin reverse proxy platform. Newt establishes an outbound tunnel from a Docker host back to your Pangolin server, allowing Pangolin to route traffic to services on that host without opening inbound ports.
+
+## Architecture
+
+```
+┌─────────────────────────┐         ┌──────────────────────────┐
+│  Target Docker Host     │         │  Pangolin Server         │
+│                         │         │  pangolin.wulfconsulting  │
+│  ┌───────────────────┐  │ tunnel  │  .cloud                  │
+│  │ newt container     │──────────▶│                          │
+│  │ (fosrl/newt)       │  │        │  Routes traffic to sites │
+│  └───────────────────┘  │        │  configured in dashboard  │
+│                         │         └──────────────────────────┘
+│  /opt/stacks/newt/      │
+│  └── compose.yaml       │
+└─────────────────────────┘
+```
+
+### Playbook structure
+
+| Section | Purpose |
+|---------|---------|
+| **vars** | Sets `newt_stack_dir` (`/opt/stacks/newt`) and the default `pangolin_endpoint` |
+| **pre_tasks** | Validates that `newt_id`, `newt_secret`, and `pangolin_endpoint` are provided; checks Docker is running |
+| **tasks** | Creates the stack directory, writes `compose.yaml`, and deploys via `docker_compose_v2` |
+
+The compose file defines a single service — the `fosrl/newt` image configured with three environment variables that authenticate it to the Pangolin server.
+
+## Usage
+
+### Required extra vars
+
+| Variable | Source | Description |
+|----------|--------|-------------|
+| `newt_id` | Pangolin dashboard (per-site) | Tunnel identity |
+| `newt_secret` | Pangolin dashboard (per-site) | Tunnel secret |
+
+### Optional extra vars
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `pangolin_endpoint` | `https://pangolin.wulfconsulting.cloud` | Pangolin server URL |
+
+### Deploy to a host
+
+```bash
+ansible-playbook playbooks/newt.yml --limit kaercher02 \
+  -e newt_id=kigig6jtds5qr3a \
+  -e newt_secret=9qznq1wasaapy0cwpxzzi8sji6z5r4nkukqpkt4k8lyy6jx3
+```
+
+### Override the Pangolin endpoint
+
+```bash
+ansible-playbook playbooks/newt.yml --limit somehost \
+  -e newt_id=... \
+  -e newt_secret=... \
+  -e pangolin_endpoint=https://pangolin.other.domain
+```
+
+### Verify the container is running
+
+```bash
+ansible kaercher02 -a "docker ps --filter name=newt"
+```
+
+## Notes
+
+- **Credentials are runtime-only.** `newt_id` and `newt_secret` are passed as extra vars and written into the compose file on the target host. They are not stored in the Ansible repo.
+- **One Newt per host.** The container name is fixed to `newt`, so each host runs a single instance. If you need multiple tunnels on one host, duplicate the playbook with a different container name and stack directory.
+- **`--limit` is required.** The playbook targets `all` hosts, so always use `--limit` to select which host to deploy to.

playbooks/newt.yml

@@ -0,0 +1,66 @@
+- name: Deploy Newt (Pangolin tunnel agent)
+  hosts: all
+  become: true
+
+  vars:
+    newt_stack_dir: "/opt/stacks/newt"
+    pangolin_endpoint: "https://pangolin.wulfconsulting.cloud"
+
+  pre_tasks:
+    - name: Fail if newt_id is not set
+      fail:
+        msg: "newt_id is required. Pass it via -e newt_id=..."
+      when: newt_id is not defined or newt_id | length == 0
+
+    - name: Fail if newt_secret is not set
+      fail:
+        msg: "newt_secret is required. Pass it via -e newt_secret=..."
+      when: newt_secret is not defined or newt_secret | length == 0
+
+    - name: Fail if pangolin_endpoint is not set
+      fail:
+        msg: "pangolin_endpoint is required. Pass it via -e pangolin_endpoint=..."
+      when: pangolin_endpoint is not defined or pangolin_endpoint | length == 0
+
+    - name: Verify Docker is running
+      service_facts:
+
+    - name: Fail if Docker service is not running
+      fail:
+        msg: "Docker is not running on this host."
+      when: "'docker.service' not in ansible_facts.services or ansible_facts.services['docker.service'].state != 'running'"
+
+  tasks:
+    - name: Create stack directory
+      file:
+        path: "{{ newt_stack_dir }}"
+        state: directory
+        mode: "0755"
+
+    - name: Write compose.yaml
+      copy:
+        dest: "{{ newt_stack_dir }}/compose.yaml"
+        mode: "0644"
+        content: |
+          networks:
+            shared:
+              external: true
+
+          services:
+            newt:
+              image: fosrl/newt
+              container_name: newt
+              restart: unless-stopped
+              networks:
+                - shared
+              environment:
+                PANGOLIN_ENDPOINT: {{ pangolin_endpoint }}
+                NEWT_ID: {{ newt_id }}
+                NEWT_SECRET: {{ newt_secret }}
+
+    - name: Deploy Newt stack
+      community.docker.docker_compose_v2:
+        project_src: "{{ newt_stack_dir }}"
+        pull: always
+        build: never
+        state: present