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Controlling Matrix federation (optional)
By default, your server federates with the whole Matrix network. That is, people on your server can communicate with people on any other Matrix server.
Federating only with select servers
To make your server only federate with servers of your choosing, add this to your configuration file (inventory/host_vars/matrix.<your-domain>/vars.yml):
matrix_synapse_federation_domain_whitelist:
- example.com
- another.com
If you wish to disable federation, you can do that with an empty list ([]), or better yet by completely disabling federation (see below).
Exposing the room directory over federation
By default, your server's public rooms directory is not exposed to other servers via federation.
If you wish to expose it, add this to your configuration file (inventory/host_vars/matrix.<your-domain>/vars.yml):
matrix_synapse_allow_public_rooms_over_federation: true
Disabling federation
To completely disable federation, isolating your server from the rest of the Matrix network, add this to your configuration file (inventory/host_vars/matrix.<your-domain>/vars.yml):
matrix_synapse_federation_enabled: false
With that, your server's users will only be able to talk among themselves, but not to anyone who is on another server.