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configuring-playbook-sliding-sync-proxy.md

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Setting up the Sliding Sync proxy (optional)

Note: The sliding-sync proxy is not required anymore as it's been replaced with a different method (called Simplified Sliding Sync) which is integrated into newer homeservers by default (Conduit homeserver from version 0.6.0 or Synapse from version 1.114). This component and documentation remain here for historical purposes, but installing this old sliding-sync proxy is generally not recommended anymore.

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

Sliding Sync is an implementation of MSC3575 and a prerequisite for running Element X clients (Element X iOS and Element X Android). See the project's documentation to learn more.

Adjusting the playbook configuration

To enable Sliding Sync proxy, add the following configuration to your inventory/host_vars/matrix.example.com/vars.yml file:

matrix_sliding_sync_enabled: true

Adjusting the Sliding Sync proxy URL

By default, this playbook installs the Sliding Sync proxy on the matrix. subdomain, at the /sliding-sync path (https://matrix.example.com/sliding-sync). This makes it easy to install it, because it doesn't require additional DNS records to be set up. If that's okay, you can skip this section.

By tweaking the matrix_sliding_sync_hostname and matrix_sliding_sync_path_prefix variables, you can easily make the service available at a different hostname and/or path than the default one.

Example additional configuration for your inventory/host_vars/matrix.example.com/vars.yml file:

# Change the default hostname and path prefix
matrix_sliding_sync_hostname: ss.example.com
matrix_sliding_sync_path_prefix: /

Adjusting DNS records

If you've changed the default hostname, you may need to adjust your DNS records to point the Honoroit domain to the Matrix server.

See Configuring DNS for details about DNS changes.

If you've decided to use the default hostname, you won't need to do any extra DNS configuration.

Installing

After configuring the playbook and potentially adjusting your DNS records, run the playbook with playbook tags as below:

ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start

The shortcut commands with the just program are also available: just install-all or just setup-all

just install-all is useful for maintaining your setup quickly (2x-5x faster than just setup-all) when its components remain unchanged. If you adjust your vars.yml to remove other components, you'd need to run just setup-all, or these components will still remain installed. Note these shortcuts run the ensure-matrix-users-created tag too.

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.example.com/sliding-sync).

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