Add federation and database pool configuration support#2
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jevonearth merged 1 commit intomainfrom Feb 25, 2026
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Enables Matrix federation for servers behind Cloudflare and adds configurable database connection pool sizes. Changes: 1. Federation for Cloudflare-proxied servers - New env var: PUBLIC_BASEURL (defaults to https://SERVER_NAME) - New env var: SERVE_WELLKNOWN (set to "true" to enable) - When enabled, Synapse serves /.well-known/matrix/server - Tells other Matrix servers to connect on port 443 instead of 8448 - Required for federation when behind Cloudflare (doesn't proxy 8448) 2. Configurable database connection pools - New env var: DB_CP_MIN (minimum connections, default: 20) - New env var: DB_CP_MAX (maximum connections, default: 80) - Previously hardcoded, now tunable per deployment 3. Documentation - Added environment variable reference - Added Cloudflare federation setup guide - Explained reverse proxy requirements These changes maintain backward compatibility - all new variables have sensible defaults. Existing deployments work unchanged. Use case: ECAD's beacon servers are behind Cloudflare and need to federate with Papers' servers. This enables cross-operator relay infrastructure as intended by the Beacon/Matrix architecture.
jevonearth
approved these changes
Feb 25, 2026
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Summary
Adds support for Matrix federation behind Cloudflare and configurable database connection pools.
Problem
Solution
1. Cloudflare Federation Support
New environment variables:
PUBLIC_BASEURL: Public URL for federation (defaults tohttps://SERVER_NAME)SERVE_WELLKNOWN: Set to"true"to enable.well-known/matrix/serverdelegationWhen
SERVE_WELLKNOWN=true:/.well-known/matrix/serverwith delegation to port 443Implementation uses Synapse's built-in
serve_server_wellknownsetting, automatically added by the entrypoint script.2. Configurable Database Connection Pools
New environment variables:
DB_CP_MIN: Minimum connections (default:20)DB_CP_MAX: Maximum connections (default:80)Previously hardcoded values are now configurable per deployment.
Changes
Files Modified
homeserver.yaml: Addedpublic_baseurl, changedcp_min/cp_maxto use template variablessynctl_entrypoint.sh: Added defaults and variable substitution for new env vars, implemented SERVE_WELLKNOWN logicREADME.md: Documented new variables and added Cloudflare federation setup guideBackward Compatibility
✅ Fully backward compatible
Testing
docker-compose.example.ymlUse Case
ECAD operates beacon relay servers behind Cloudflare that need to federate with Papers' servers and other operators. This enables the multi-operator relay infrastructure that Beacon/Matrix is designed for.
References