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configuring-playbook-sliding-sync-proxy.md

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Setting up Sliding Sync Proxy (optional)

The playbook can install and configure sliding-sync proxy for you.

Sliding Sync is an implementation of MSC3575 and a prerequisite for running the new (still beta) Element X clients (Element X iOS and Element X Android).

See the project's documentation to learn more.

Element X iOS is available on TestFlight.

Element X Android requires manual compilation to get it working with a non-matrix.org homeseserver. It's also less feature-complete than the iOS version.

NOTE: The Sliding Sync proxy only works with the Traefik reverse-proxy. If you have an old server installation (from the time matrix-nginx-proxy was our default reverse-proxy - matrix_playbook_reverse_proxy_type: playbook-managed-nginx), you won't be able to use Sliding Sync.

Decide on a domain and path

By default, the Sliding Sync proxy is configured to be served on the Matrix domain (matrix.DOMAIN, controlled by matrix_server_fqn_matrix), under the /sliding-sync path.

This makes it easy to set it up, without having to adjust your DNS records.

If you'd like to run the Sliding Sync proxy on another hostname or path, use the matrix_sliding_sync_hostname and matrix_sliding_sync_path_prefix variables.

Adjusting DNS records

If you've changed the default hostame, you may need to adjust your DNS records.

Adjusting the playbook configuration

Add the following configuration to your inventory/host_vars/matrix.DOMAIN/vars.yml file:

matrix_sliding_sync_enabled: true

Installing

After potentially adjusting DNS records and configuring the playbook, run the installation command again: just install-all.

External databases

Please note that, if your setup utilizes an external database, you must also establish configuration for the sliding sync proxy. Alter the defaults below to suit your configuration:

matrix_sliding_sync_database_username: 'matrix_sliding_sync'
matrix_sliding_sync_database_password: ''
matrix_sliding_sync_database_hostname: ''
matrix_sliding_sync_database_port: 5432
matrix_sliding_sync_database_name: 'matrix_sliding_sync'

Usage

You don't need to do anything special to make use of the Sliding Sync Proxy. Simply open your client which supports Sliding Sync (like Element X) and log in.

When the Sliding Sync proxy is installed, your /.well-known/matrix/client file is also updated. A new org.matrix.msc3575.proxy section and url property are added there and made to point to your Sliding Sync proxy's base URL (e.g. https://matrix.DOMAIN/sliding-sync).

This allows clients which support Sliding Sync to detect the Sliding Sync Proxy's URL and make use of it.