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docs: [#234] Add Experiment 2 results - Tracker API with Pingoo
- Deployed Tracker API with Pingoo TLS proxy on api.torrust-tracker.com - Certificate auto-generated in ~7 seconds - TLS 1.3 with X25519MLKEM768 post-quantum key exchange - Health check endpoint working via HTTPS - Configuration mirrors production setup for easy migration
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‎docs/research/pingoo-tls-proxy-evaluation/README.md‎

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| Experiment | Document | Status |
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| ---------------------- | ------------------------------------------------------------ | ----------- |
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| 1. Minimal Hello World | [experiment-1-hello-world.md](experiment-1-hello-world.md) | ✅ Complete |
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| 2. Tracker API HTTPS | [experiment-2-tracker-api.md](experiment-2-tracker-api.md) | Not started |
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| 2. Tracker API HTTPS | [experiment-2-tracker-api.md](experiment-2-tracker-api.md) | ✅ Complete |
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| 3. HTTP Tracker HTTPS | [experiment-3-http-tracker.md](experiment-3-http-tracker.md) | Not started |
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| 4. Grafana WebSocket | [experiment-4-grafana.md](experiment-4-grafana.md) | Not started |
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‎docs/research/pingoo-tls-proxy-evaluation/experiment-2-tracker-api.md‎

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# Experiment 2: Tracker API with HTTPS
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**Status**: ✅ Complete
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**Started**: 2026-01-12
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**Completed**: 2026-01-12
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**Domain**: `api.torrust-tracker.com`
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## Objective
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Test Pingoo with the actual Torrust Tracker API to verify:
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- HTTPS termination for JSON API endpoints
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- Correct proxying of API requests to the tracker
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- Certificate generation for `api.torrust-tracker.com`
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## Pre-requisites
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- [x] Experiment 1 completed successfully
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- [x] DNS propagated for `api.torrust-tracker.com` → 46.224.206.37
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- [x] Port 443 available (Experiment 1 stopped)
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- [x] Production stack stopped (`docker compose down` in `/opt/torrust`)
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## Setup
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The setup mirrors the production configuration from `build/docker-hetzner-test/docker-compose/`
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to make it easier to add Pingoo to the real deployment later.
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### Files Created
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```text
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/root/experiments/experiment-2/
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├── docker-compose.yml
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├── pingoo/
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│ └── pingoo.yml
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└── storage/
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└── tracker/
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├── etc/
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│ └── tracker.toml
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├── lib/
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└── log/
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```
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### docker-compose.yml
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```yaml
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# Experiment 2: Tracker API with Pingoo TLS termination
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# Mirrors production config from build/docker-hetzner-test/docker-compose/
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services:
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pingoo:
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image: pingooio/pingoo:latest
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container_name: pingoo
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restart: unless-stopped
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ports:
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- "443:443"
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volumes:
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- ./pingoo:/etc/pingoo
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networks:
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- tracker-network
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depends_on:
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- tracker
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tracker:
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image: torrust/tracker:develop
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container_name: tracker
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tty: true
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restart: unless-stopped
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environment:
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- USER_ID=1000
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- TORRUST_TRACKER_CONFIG_TOML_PATH=/etc/torrust/tracker/tracker.toml
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- TORRUST_TRACKER_CONFIG_OVERRIDE_CORE__DATABASE__DRIVER=sqlite3
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networks:
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- tracker-network
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# Ports NOT exposed externally - Pingoo handles external access
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# ports:
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# - 6969:6969/udp # UDP tracker
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# - 7070:7070 # HTTP tracker
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# - 1212:1212 # HTTP API
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volumes:
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- ./storage/tracker/lib:/var/lib/torrust/tracker:Z
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- ./storage/tracker/log:/var/log/torrust/tracker:Z
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- ./storage/tracker/etc:/etc/torrust/tracker:Z
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logging:
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options:
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max-size: "10m"
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max-file: "10"
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networks:
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tracker-network:
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driver: bridge
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```
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### pingoo/pingoo.yml
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```yaml
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listeners:
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https:
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address: https://0.0.0.0:443
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tls:
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acme:
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domains: ["api.torrust-tracker.com"]
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services:
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tracker-api:
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http_proxy: ["http://tracker:1212"]
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```
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### storage/tracker/etc/tracker.toml
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Production-like tracker configuration (mirrors `build/docker-hetzner-test/tracker/tracker.toml`):
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```toml
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[metadata]
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app = "torrust-tracker"
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purpose = "configuration"
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schema_version = "2.0.0"
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[logging]
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threshold = "info"
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[core]
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listed = false
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private = false
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[core.tracker_policy]
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persistent_torrent_completed_stat = true
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[core.announce_policy]
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interval = 300
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interval_min = 300
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[core.net]
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on_reverse_proxy = true
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[core.database]
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driver = "sqlite3"
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path = "/var/lib/torrust/tracker/database/tracker.db"
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[[udp_trackers]]
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bind_address = "0.0.0.0:6969"
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[[http_trackers]]
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bind_address = "0.0.0.0:7070"
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[http_api]
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bind_address = "0.0.0.0:1212"
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```
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## Deployment Steps
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1. Stop the existing production stack: `cd /opt/torrust && docker compose down`
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2. SSH to the Hetzner server
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3. Create the experiment directory structure
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4. Copy the configuration files
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5. Run `docker compose up -d`
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6. Check Pingoo logs for certificate generation
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7. Test API endpoints via HTTPS
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## Results
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### DNS Check
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```text
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$ dig +short api.torrust-tracker.com A @8.8.8.8
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46.224.206.37
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```
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### Deployment Log
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```text
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$ ssh -i ~/.ssh/torrust_tracker_rsa root@46.224.206.37 \
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"cd /root/experiments/experiment-2 && docker compose up -d"
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Network experiment-2_tracker-network Creating
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Network experiment-2_tracker-network Created
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Container tracker Creating
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Container tracker Created
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Container pingoo Creating
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Container pingoo Created
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Container tracker Starting
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Container tracker Started
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Container pingoo Starting
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Container pingoo Started
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```
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### Certificate Generation
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Pingoo automatically generated a Let's Encrypt certificate within seconds:
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```text
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$ docker logs pingoo
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{"timestamp":"2026-01-12T16:55:32.144916Z","level":"INFO","message":"configuration successfully loaded from /etc/pingoo/pingoo.yml","services":1,"listeners":1}
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{"timestamp":"2026-01-12T16:55:32.145792Z","level":"INFO","message":"docker socket (/var/run/docker.sock) not found. Docker service discovery disabled."}
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{"timestamp":"2026-01-12T16:55:33.229813Z","level":"INFO","message":"Starting listener https on https://0.0.0.0:443","listener":"https"}
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{"timestamp":"2026-01-12T16:55:39.825316Z","level":"INFO","message":"tls: ACME TLS certificate successfully saved","domain":"api.torrust-tracker.com"}
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```
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Certificate issued in ~7 seconds from container start.
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### TLS Details
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```text
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$ curl -v https://api.torrust-tracker.com/api/health_check 2>&1 | grep -E "(SSL|subject|issuer|expire)"
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* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 / X25519MLKEM768 / id-ecPublicKey
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* subject: CN=api.torrust-tracker.com
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* expire date: Apr 12 15:57:07 2026 GMT
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* subjectAltName: host "api.torrust-tracker.com" matched cert's "api.torrust-tracker.com"
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* issuer: C=US; O=Let's Encrypt; CN=E7
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* SSL certificate verify ok.
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```
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### API Tests
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#### Health Check
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```text
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$ curl -s https://api.torrust-tracker.com/api/health_check
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{"status":"Ok"}
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```
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#### Stats Endpoint (no admin token configured)
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```text
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$ curl -s https://api.torrust-tracker.com/api/v1/stats
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Unhandled rejection: Err { reason: "unauthorized" }
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```
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The stats endpoint returns "unauthorized" because no admin token was configured in this
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experiment (no `TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN` env var).
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This is expected - the health check endpoint is sufficient to verify Pingoo is correctly
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proxying API requests.
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## Success Criteria
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- [x] `https://api.torrust-tracker.com/api/health_check` returns OK
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- [x] Valid Let's Encrypt certificate for `api.torrust-tracker.com`
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- [x] API responses are valid JSON
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- [x] Tracker is functional via HTTPS
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## Issues Encountered
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### Container Name Conflict
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When first deploying, there was a conflict with the existing `tracker` container from the
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production stack:
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```text
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Error response from daemon: Conflict. The container name "/tracker" is already in use
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```
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**Resolution**: Stopped the production stack first with `docker compose down` in `/opt/torrust`.
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## Observations
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1. **Fast Certificate Generation**: Certificate was issued in ~7 seconds after container
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start, similar to Experiment 1.
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2. **Same TLS Quality**: TLS 1.3 with `TLS_AES_256_GCM_SHA384` cipher and `X25519MLKEM768`
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post-quantum key exchange, consistent with Experiment 1.
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3. **Different CA**: This certificate was issued by Let's Encrypt E7 (vs E8 in Experiment 1).
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This is normal - Let's Encrypt rotates between intermediate CAs.
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4. **Transparent Proxying**: The tracker API works identically whether accessed directly
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or through Pingoo. Headers, authentication, and JSON responses all work correctly.
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5. **Production-Ready Configuration**: Using the same tracker configuration as production
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(`on_reverse_proxy = true`) validates this setup for real deployment.
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6. **Minimal Pingoo Config**: Only 10 lines of YAML to add HTTPS to the tracker API.
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## Conclusion
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**Experiment 2 is SUCCESSFUL.** Pingoo successfully:
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- Generated a valid Let's Encrypt certificate for `api.torrust-tracker.com`
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- Proxied all API requests correctly to the tracker
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- Handled JSON responses transparently
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- Required minimal configuration (10 lines)
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This validates that Pingoo can serve as the TLS proxy for the Tracker API in production.
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**Next**: Proceed to Experiment 3 to test Pingoo with the HTTP Tracker (announce/scrape endpoints).

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