echo6-docs/vault/docs/matrix/synapse.md

---
title: Synapse Deployment Reference
type: reference
tags:
  - matrix
aliases: []
related:
  - [[matrix-synapse-deployment]]
  - [[mautrix_signal]]
  - [[matrix_host]]
  - [[synapse_retention_discovery]]
  - [[caddy]]
updated: 2026-06-18
---
# Synapse Deployment Reference
# Generated: 2026-04-09 (Phase 1)

## Install Method
- Docker Compose at /opt/matrix/docker-compose.yml
- Four containers on `matrix-net` bridge network:
  - matrix-synapse (matrixdotorg/synapse:latest) → 127.0.0.1:8008
  - matrix-mas (ghcr.io/element-hq/matrix-authentication-service:latest) → 127.0.0.1:8085
  - matrix-postgres (postgres:16-alpine) → internal 5432
  - matrix-element (vectorim/element-web:latest) → 127.0.0.1:8088

## Synapse Version
- 1.147.1 (confirmed via admin API and docker exec)

## Key Config Values (from homeserver.yaml)
- server_name: echo6.co
- public_baseurl: https://matrix.echo6.co/
- listeners: port 8008, HTTP, x_forwarded=true, bind 0.0.0.0, resources=[client, federation]
- database: psycopg2 → matrix-postgres:5432, db=synapse, user=synapse
- media_store_path: /data/media_store (95 MB used)
- registration_shared_secret: PRESENT (not redacted here — see synapse_homeserver.yaml.sanitized)
- signing_key_path: /data/echo6.co.signing.key
- enable_registration: false
- url_preview_enabled: true
- report_stats: false
- app_service_config_files: NOT PRESENT (no appservices currently registered)
- encryption_enabled_by_default_for_room_type: NOT SET (default=off)
- MAS delegation: enabled, endpoint=http://matrix-mas:8080/, shared secret present

## MAS (Matrix Authentication Service)
- Version: v1.12.0
- Listen: 8080 (web), 8081 (internal/health)
- Database: postgresql://mas:***@matrix-postgres:5432/mas
- Upstream OAuth2: [[authentik]] (auth.echo6.co) via OIDC
  - Client ID: 93kCoZkBlnJyD9EcAm7E4btKflecOcBm9DGONB5T
  - Issuer: https://auth.echo6.co/application/o/matrix/
- Matrix integration: kind=synapse, homeserver=echo6.co, endpoint=http://matrix-synapse:8008/
- Passwords: enabled (bcrypt v1 + argon2id v2)
- Email transport: blackhole (not sending)

## Database (PostgreSQL)
- Version: 16.12 (Alpine)
- Host: matrix-postgres container on matrix-net
- Databases: synapse (owner: synapse), mas (owner: mas), postgres, template0, template1
- Users: synapse (Superuser, Create role, Create DB), mas (regular)
- Auth: password from .env file (POSTGRES_PASSWORD)
- New DB/user can be created without collision — synapse user has Superuser/Create role privileges

## Reverse Proxy (Caddy on Contabo)
- matrix.echo6.co routes:
  - /_matrix/client/*/login|logout|refresh|auth_metadata → MAS (127.0.0.1:8085)
  - /_matrix/* → Synapse (127.0.0.1:8008)
  - /_synapse/* → Synapse (127.0.0.1:8008)
  - Everything else → MAS (127.0.0.1:8085)
- element.echo6.co → 127.0.0.1:8088

## Federation
- Well-known served from echo6.co (utility [[caddy]], NOT matrix.echo6.co)
  - /.well-known/matrix/server: {"m.server": "matrix.echo6.co:443"}
  - /.well-known/matrix/client: base_url=https://matrix.echo6.co, issuer=https://matrix.echo6.co/
- Federation tester: AllChecksOK=true, TLS 1.3, valid Ed25519 key, valid certificates
- Port 8448 exposed in container but NOT used externally (federation via 443 + well-known)

## Existing Appservices
- NONE — no app_service_config_files in homeserver.yaml, no registration files in /opt/matrix/synapse/

## Backup
- Cron: daily at 3 AM via /opt/matrix/scripts/pg_backup.sh
- Backs up synapse DB only (NOT mas DB)
- Retention: 14 days
- Location: /opt/matrix/backups/

## Ports in 29xxx Range
- NONE in use — confirmed via ss -tlnp

## MSC4190 Support
- Synapse 1.147.1 supports MSC4190 (merged in 1.121.0)
- Requires io.element.msc4190: true in appservice registration file
- Also requires experimental_features.msc3202_transaction_extensions: true in homeserver.yaml