matrix-docker-ansible-deploy/docs/configuring-playbook-sygnal.md

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# Setting up Sygnal (optional)
The playbook can install and configure the [Sygnal](https://github.com/matrix-org/sygnal) push gateway for you.
See the project's [documentation](https://github.com/matrix-org/sygnal) to learn what it does and why it might be useful to you.
**Note**: most people don't need to install their own gateway. As Sygnal's [Notes for application developers](https://github.com/matrix-org/sygnal/blob/master/docs/applications.md) documentation says:
> It is not feasible to allow end-users to configure their own Sygnal instance, because the Sygnal instance needs the appropriate FCM or APNs secrets that belong to the application.
This optional playbook component is only useful to people who develop/build their own Matrix client applications themselves.
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## Decide on a domain and path
By default, Sygnal is configured to use its own dedicated domain (`sygnal.DOMAIN`) and requires you to [adjust your DNS records](#adjusting-dns-records).
You can override the domain and path like this:
```yaml
# Switch to the domain used for Matrix services (`matrix.DOMAIN`),
# so we won't need to add additional DNS records for Sygnal.
matrix_sygnal_hostname: "{{ matrix_server_fqn_matrix }}"
# Expose under the /sygnal subpath
matrix_sygnal_path_prefix: /sygnal
```
## Adjusting DNS records
Once you've decided on the domain and path, **you may need to adjust your DNS** records to point the Sygnal domain to the Matrix server.
If you've decided to reuse the `matrix.` domain, you won't need to do any extra DNS configuration.
## Adjusting the playbook configuration
Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file (adapt to your needs):
```yaml
matrix_sygnal_enabled: true
# You need at least 1 app defined.
# The configuration below is incomplete. Read more below.
matrix_sygnal_apps:
com.example.myapp.ios:
type: apns
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keyfile: /data/my_key.p8
# .. more configuration ..
com.example.myapp.android:
type: gcm
api_key: your_api_key_for_gcm
# .. more configuration ..
aux_file_definitions:
- dest: "{{ matrix_sygnal_data_path }}/my_key.p8"
content: |
some
content
here
mode: '0600'
owner: "{{ matrix_user_username }}"
group: "{{ matrix_user_groupname }}"
```
For a more complete example of available fields and values they can take, see `roles/custom/matrix-sygnal/templates/sygnal.yaml.j2` (or the [upstream `sygnal.yaml.sample` configuration file](https://github.com/matrix-org/sygnal/blob/master/sygnal.yaml.sample)).
Configuring [GCM/FCM](https://firebase.google.com/docs/cloud-messaging/) is easier, as it only requires that you provide some config values.
To configure [APNS](https://developer.apple.com/notifications/) (Apple Push Notification Service), you'd need to provide one or more certificate files.
To do that, the above example configuration:
- makes use of the [`aux` role](https://github.com/mother-of-all-self-hosting/ansible-role-aux) (and its `aux_file_definitions` variable) to make the playbook install files into `/matrix/sygnal/data` (the `matrix_sygnal_data_path` variable). See [`defaults/main.yml` file](https://github.com/mother-of-all-self-hosting/ansible-role-aux/blob/main/defaults/main.yml) of the `aux` role for usage examples. It also makes sure the files are owned by `matrix:matrix`, so that Sygnal can read them. Of course, you can also install these files manually yourself, if you'd rather not use `aux`.
- references these files in the Sygnal configuration (`matrix_sygnal_apps`) using a path like `/data/..` (the `/matrix/sygnal/data` directory on the host system is mounted into the `/data` directory inside the container)
## Installing
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After configuring the playbook and potentially [adjusting your DNS records](#adjusting-dns-records), run the [installation](installing.md) command:
```
ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start
```
## Usage
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To make use of your Sygnal installation, you'd need to build your own Matrix client application, which uses the same API keys (for [GCM/FCM](https://firebase.google.com/docs/cloud-messaging/)) and certificates (for [APNS](https://developer.apple.com/notifications/)) and is to your Sygnal URL endpoint (e.g. `https://sygnal.DOMAIN`).
Refer to Sygnal's [Notes for application developers](https://github.com/matrix-org/sygnal/blob/master/docs/applications.md) document.