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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="federate.html">Federation</a></li><li class="chapter-item expanded "><a href="usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="templates.html">Templates</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li 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Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a 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<h1 id="scaling-synapse-via-workers"><a class="header" href="#scaling-synapse-via-workers">Scaling synapse via workers</a></h1>
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<p>For small instances it recommended to run Synapse in the default monolith mode.
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For larger instances where performance is a concern it can be helpful to split
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out functionality into multiple separate python processes. These processes are
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called 'workers', and are (eventually) intended to scale horizontally
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independently.</p>
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<p>Synapse's worker support is under active development and subject to change as
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we attempt to rapidly scale ever larger Synapse instances. However we are
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documenting it here to help admins needing a highly scalable Synapse instance
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similar to the one running <code>matrix.org</code>.</p>
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<p>All processes continue to share the same database instance, and as such,
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workers only work with PostgreSQL-based Synapse deployments. SQLite should only
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be used for demo purposes and any admin considering workers should already be
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running PostgreSQL.</p>
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<p>See also <a href="https://matrix.org/blog/2020/11/03/how-we-fixed-synapses-scalability">Matrix.org blog post</a>
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for a higher level overview.</p>
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<h2 id="main-processworker-communication"><a class="header" href="#main-processworker-communication">Main process/worker communication</a></h2>
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<p>The processes communicate with each other via a Synapse-specific protocol called
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'replication' (analogous to MySQL- or Postgres-style database replication) which
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feeds streams of newly written data between processes so they can be kept in
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sync with the database state.</p>
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<p>When configured to do so, Synapse uses a
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<a href="https://redis.io/docs/manual/pubsub/">Redis pub/sub channel</a> to send the replication
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stream between all configured Synapse processes. Additionally, processes may
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make HTTP requests to each other, primarily for operations which need to wait
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for a reply ─ such as sending an event.</p>
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<p>Redis support was added in v1.13.0 with it becoming the recommended method in
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v1.18.0. It replaced the old direct TCP connections (which is deprecated as of
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v1.18.0) to the main process. With Redis, rather than all the workers connecting
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to the main process, all the workers and the main process connect to Redis,
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which relays replication commands between processes. This can give a significant
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cpu saving on the main process and will be a prerequisite for upcoming
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performance improvements.</p>
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<p>If Redis support is enabled Synapse will use it as a shared cache, as well as a
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pub/sub mechanism.</p>
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<p>See the <a href="#architectural-diagram">Architectural diagram</a> section at the end for
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a visualisation of what this looks like.</p>
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<h2 id="setting-up-workers"><a class="header" href="#setting-up-workers">Setting up workers</a></h2>
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<p>A Redis server is required to manage the communication between the processes.
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The Redis server should be installed following the normal procedure for your
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distribution (e.g. <code>apt install redis-server</code> on Debian). It is safe to use an
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existing Redis deployment if you have one.</p>
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<p>Once installed, check that Redis is running and accessible from the host running
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Synapse, for example by executing <code>echo PING | nc -q1 localhost 6379</code> and seeing
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a response of <code>+PONG</code>.</p>
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<p>The appropriate dependencies must also be installed for Synapse. If using a
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virtualenv, these can be installed with:</p>
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<pre><code class="language-sh">pip install "matrix-synapse[redis]"
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</code></pre>
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<p>Note that these dependencies are included when synapse is installed with <code>pip install matrix-synapse[all]</code>. They are also included in the debian packages from
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<code>matrix.org</code> and in the docker images at
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https://hub.docker.com/r/matrixdotorg/synapse/.</p>
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<p>To make effective use of the workers, you will need to configure an HTTP
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reverse-proxy such as nginx or haproxy, which will direct incoming requests to
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the correct worker, or to the main synapse instance. See
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<a href="reverse_proxy.html">the reverse proxy documentation</a> for information on setting up a reverse
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proxy.</p>
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<p>When using workers, each worker process has its own configuration file which
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contains settings specific to that worker, such as the HTTP listener that it
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provides (if any), logging configuration, etc.</p>
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<p>Normally, the worker processes are configured to read from a shared
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configuration file as well as the worker-specific configuration files. This
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makes it easier to keep common configuration settings synchronised across all
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the processes.</p>
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<p>The main process is somewhat special in this respect: it does not normally
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need its own configuration file and can take all of its configuration from the
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shared configuration file.</p>
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<h3 id="shared-configuration"><a class="header" href="#shared-configuration">Shared configuration</a></h3>
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<p>Normally, only a couple of changes are needed to make an existing configuration
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file suitable for use with workers. First, you need to enable an "HTTP replication
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listener" for the main process; and secondly, you need to enable redis-based
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replication. Optionally, a shared secret can be used to authenticate HTTP
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traffic between workers. For example:</p>
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<pre><code class="language-yaml"># extend the existing `listeners` section. This defines the ports that the
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# main process will listen on.
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listeners:
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# The HTTP replication port
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- port: 9093
|
|
bind_address: '127.0.0.1'
|
|
type: http
|
|
resources:
|
|
- names: [replication]
|
|
|
|
# Add a random shared secret to authenticate traffic.
|
|
worker_replication_secret: ""
|
|
|
|
redis:
|
|
enabled: true
|
|
</code></pre>
|
|
<p>See the sample config for the full documentation of each option.</p>
|
|
<p>Under <strong>no circumstances</strong> should the replication listener be exposed to the
|
|
public internet; it has no authentication and is unencrypted.</p>
|
|
<h3 id="worker-configuration"><a class="header" href="#worker-configuration">Worker configuration</a></h3>
|
|
<p>In the config file for each worker, you must specify the type of worker
|
|
application (<code>worker_app</code>), and you should specify a unique name for the worker
|
|
(<code>worker_name</code>). The currently available worker applications are listed below.
|
|
You must also specify the HTTP replication endpoint that it should talk to on
|
|
the main synapse process. <code>worker_replication_host</code> should specify the host of
|
|
the main synapse and <code>worker_replication_http_port</code> should point to the HTTP
|
|
replication port. If the worker will handle HTTP requests then the
|
|
<code>worker_listeners</code> option should be set with a <code>http</code> listener, in the same way
|
|
as the <code>listeners</code> option in the shared config.</p>
|
|
<p>For example:</p>
|
|
<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
|
|
worker_name: generic_worker1
|
|
|
|
# The replication listener on the main synapse process.
|
|
worker_replication_host: 127.0.0.1
|
|
worker_replication_http_port: 9093
|
|
|
|
worker_listeners:
|
|
- type: http
|
|
port: 8083
|
|
resources:
|
|
- names: [client, federation]
|
|
|
|
worker_log_config: /etc/matrix-synapse/generic-worker-log.yaml
|
|
</code></pre>
|
|
<p>...is a full configuration for a generic worker instance, which will expose a
|
|
plain HTTP endpoint on port 8083 separately serving various endpoints, e.g.
|
|
<code>/sync</code>, which are listed below.</p>
|
|
<p>Obviously you should configure your reverse-proxy to route the relevant
|
|
endpoints to the worker (<code>localhost:8083</code> in the above example).</p>
|
|
<h3 id="running-synapse-with-workers"><a class="header" href="#running-synapse-with-workers">Running Synapse with workers</a></h3>
|
|
<p>Finally, you need to start your worker processes. This can be done with either
|
|
<code>synctl</code> or your distribution's preferred service manager such as <code>systemd</code>. We
|
|
recommend the use of <code>systemd</code> where available: for information on setting up
|
|
<code>systemd</code> to start synapse workers, see
|
|
<a href="systemd-with-workers">Systemd with Workers</a>. To use <code>synctl</code>, see
|
|
<a href="synctl_workers.html">Using synctl with Workers</a>.</p>
|
|
<h2 id="available-worker-applications"><a class="header" href="#available-worker-applications">Available worker applications</a></h2>
|
|
<h3 id="synapseappgeneric_worker"><a class="header" href="#synapseappgeneric_worker"><code>synapse.app.generic_worker</code></a></h3>
|
|
<p>This worker can handle API requests matching the following regular expressions.
|
|
These endpoints can be routed to any worker. If a worker is set up to handle a
|
|
stream then, for maximum efficiency, additional endpoints should be routed to that
|
|
worker: refer to the <a href="#stream-writers">stream writers</a> section below for further
|
|
information.</p>
|
|
<pre><code># Sync requests
|
|
^/_matrix/client/(r0|v3)/sync$
|
|
^/_matrix/client/(api/v1|r0|v3)/events$
|
|
^/_matrix/client/(api/v1|r0|v3)/initialSync$
|
|
^/_matrix/client/(api/v1|r0|v3)/rooms/[^/]+/initialSync$
|
|
|
|
# Federation requests
|
|
^/_matrix/federation/v1/event/
|
|
^/_matrix/federation/v1/state/
|
|
^/_matrix/federation/v1/state_ids/
|
|
^/_matrix/federation/v1/backfill/
|
|
^/_matrix/federation/v1/get_missing_events/
|
|
^/_matrix/federation/v1/publicRooms
|
|
^/_matrix/federation/v1/query/
|
|
^/_matrix/federation/v1/make_join/
|
|
^/_matrix/federation/v1/make_leave/
|
|
^/_matrix/federation/(v1|v2)/send_join/
|
|
^/_matrix/federation/(v1|v2)/send_leave/
|
|
^/_matrix/federation/(v1|v2)/invite/
|
|
^/_matrix/federation/v1/event_auth/
|
|
^/_matrix/federation/v1/exchange_third_party_invite/
|
|
^/_matrix/federation/v1/user/devices/
|
|
^/_matrix/federation/v1/get_groups_publicised$
|
|
^/_matrix/key/v2/query
|
|
^/_matrix/federation/(v1|unstable/org.matrix.msc2946)/hierarchy/
|
|
|
|
# Inbound federation transaction request
|
|
^/_matrix/federation/v1/send/
|
|
|
|
# Client API requests
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/createRoom$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/publicRooms$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/joined_members$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/context/.*$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/members$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/state$
|
|
^/_matrix/client/(v1|unstable/org.matrix.msc2946)/rooms/.*/hierarchy$
|
|
^/_matrix/client/unstable/im.nheko.summary/rooms/.*/summary$
|
|
^/_matrix/client/(r0|v3|unstable)/account/3pid$
|
|
^/_matrix/client/(r0|v3|unstable)/devices$
|
|
^/_matrix/client/versions$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/voip/turnServer$
|
|
^/_matrix/client/(r0|v3|unstable)/joined_groups$
|
|
^/_matrix/client/(r0|v3|unstable)/publicised_groups$
|
|
^/_matrix/client/(r0|v3|unstable)/publicised_groups/
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/event/
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/joined_rooms$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/search$
|
|
|
|
# Encryption requests
|
|
^/_matrix/client/(r0|v3|unstable)/keys/query$
|
|
^/_matrix/client/(r0|v3|unstable)/keys/changes$
|
|
^/_matrix/client/(r0|v3|unstable)/keys/claim$
|
|
^/_matrix/client/(r0|v3|unstable)/room_keys/
|
|
|
|
# Registration/login requests
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/login$
|
|
^/_matrix/client/(r0|v3|unstable)/register$
|
|
^/_matrix/client/v1/register/m.login.registration_token/validity$
|
|
|
|
# Event sending requests
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/redact
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/send
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/state/
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/(join|invite|leave|ban|unban|kick)$
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/join/
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/profile/
|
|
|
|
# Device requests
|
|
^/_matrix/client/(r0|v3|unstable)/sendToDevice/
|
|
|
|
# Account data requests
|
|
^/_matrix/client/(r0|v3|unstable)/.*/tags
|
|
^/_matrix/client/(r0|v3|unstable)/.*/account_data
|
|
|
|
# Receipts requests
|
|
^/_matrix/client/(r0|v3|unstable)/rooms/.*/receipt
|
|
^/_matrix/client/(r0|v3|unstable)/rooms/.*/read_markers
|
|
|
|
# Presence requests
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/presence/
|
|
</code></pre>
|
|
<p>Additionally, the following REST endpoints can be handled for GET requests:</p>
|
|
<pre><code>^/_matrix/federation/v1/groups/
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/pushrules/
|
|
^/_matrix/client/(r0|v3|unstable)/groups/
|
|
</code></pre>
|
|
<p>Pagination requests can also be handled, but all requests for a given
|
|
room must be routed to the same instance. Additionally, care must be taken to
|
|
ensure that the purge history admin API is not used while pagination requests
|
|
for the room are in flight:</p>
|
|
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/messages$
|
|
</code></pre>
|
|
<p>Additionally, the following endpoints should be included if Synapse is configured
|
|
to use SSO (you only need to include the ones for whichever SSO provider you're
|
|
using):</p>
|
|
<pre><code># for all SSO providers
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/login/sso/redirect
|
|
^/_synapse/client/pick_idp$
|
|
^/_synapse/client/pick_username
|
|
^/_synapse/client/new_user_consent$
|
|
^/_synapse/client/sso_register$
|
|
|
|
# OpenID Connect requests.
|
|
^/_synapse/client/oidc/callback$
|
|
|
|
# SAML requests.
|
|
^/_synapse/client/saml2/authn_response$
|
|
|
|
# CAS requests.
|
|
^/_matrix/client/(api/v1|r0|v3|unstable)/login/cas/ticket$
|
|
</code></pre>
|
|
<p>Ensure that all SSO logins go to a single process.
|
|
For multiple workers not handling the SSO endpoints properly, see
|
|
<a href="https://github.com/matrix-org/synapse/issues/7530">#7530</a> and
|
|
<a href="https://github.com/matrix-org/synapse/issues/9427">#9427</a>.</p>
|
|
<p>Note that a HTTP listener with <code>client</code> and <code>federation</code> resources must be
|
|
configured in the <code>worker_listeners</code> option in the worker config.</p>
|
|
<h4 id="load-balancing"><a class="header" href="#load-balancing">Load balancing</a></h4>
|
|
<p>It is possible to run multiple instances of this worker app, with incoming requests
|
|
being load-balanced between them by the reverse-proxy. However, different endpoints
|
|
have different characteristics and so admins
|
|
may wish to run multiple groups of workers handling different endpoints so that
|
|
load balancing can be done in different ways.</p>
|
|
<p>For <code>/sync</code> and <code>/initialSync</code> requests it will be more efficient if all
|
|
requests from a particular user are routed to a single instance. Extracting a
|
|
user ID from the access token or <code>Authorization</code> header is currently left as an
|
|
exercise for the reader. Admins may additionally wish to separate out <code>/sync</code>
|
|
requests that have a <code>since</code> query parameter from those that don't (and
|
|
<code>/initialSync</code>), as requests that don't are known as "initial sync" that happens
|
|
when a user logs in on a new device and can be <em>very</em> resource intensive, so
|
|
isolating these requests will stop them from interfering with other users ongoing
|
|
syncs.</p>
|
|
<p>Federation and client requests can be balanced via simple round robin.</p>
|
|
<p>The inbound federation transaction request <code>^/_matrix/federation/v1/send/</code>
|
|
should be balanced by source IP so that transactions from the same remote server
|
|
go to the same process.</p>
|
|
<p>Registration/login requests can be handled separately purely to help ensure that
|
|
unexpected load doesn't affect new logins and sign ups.</p>
|
|
<p>Finally, event sending requests can be balanced by the room ID in the URI (or
|
|
the full URI, or even just round robin), the room ID is the path component after
|
|
<code>/rooms/</code>. If there is a large bridge connected that is sending or may send lots
|
|
of events, then a dedicated set of workers can be provisioned to limit the
|
|
effects of bursts of events from that bridge on events sent by normal users.</p>
|
|
<h4 id="stream-writers"><a class="header" href="#stream-writers">Stream writers</a></h4>
|
|
<p>Additionally, the writing of specific streams (such as events) can be moved off
|
|
of the main process to a particular worker.
|
|
(This is only supported with Redis-based replication.)</p>
|
|
<p>To enable this, the worker must have a HTTP replication listener configured,
|
|
have a <code>worker_name</code> and be listed in the <code>instance_map</code> config. The same worker
|
|
can handle multiple streams, but unless otherwise documented, each stream can only
|
|
have a single writer.</p>
|
|
<p>For example, to move event persistence off to a dedicated worker, the shared
|
|
configuration would include:</p>
|
|
<pre><code class="language-yaml">instance_map:
|
|
event_persister1:
|
|
host: localhost
|
|
port: 8034
|
|
|
|
stream_writers:
|
|
events: event_persister1
|
|
</code></pre>
|
|
<p>An example for a stream writer instance:</p>
|
|
<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
|
|
worker_name: event_persister1
|
|
|
|
# The replication listener on the main synapse process.
|
|
worker_replication_host: 127.0.0.1
|
|
worker_replication_http_port: 9093
|
|
|
|
worker_listeners:
|
|
- type: http
|
|
port: 8034
|
|
resources:
|
|
- names: [replication]
|
|
|
|
# Enable listener if this stream writer handles endpoints for the `typing` or
|
|
# `to_device` streams. Uses a different port to the `replication` listener to
|
|
# avoid exposing the `replication` listener publicly.
|
|
#
|
|
#- type: http
|
|
# port: 8035
|
|
# resources:
|
|
# - names: [client]
|
|
|
|
worker_log_config: /etc/matrix-synapse/event-persister-log.yaml
|
|
</code></pre>
|
|
<p>Some of the streams have associated endpoints which, for maximum efficiency, should
|
|
be routed to the workers handling that stream. See below for the currently supported
|
|
streams and the endpoints associated with them:</p>
|
|
<h5 id="the-events-stream"><a class="header" href="#the-events-stream">The <code>events</code> stream</a></h5>
|
|
<p>The <code>events</code> stream experimentally supports having multiple writers, where work
|
|
is sharded between them by room ID. Note that you <em>must</em> restart all worker
|
|
instances when adding or removing event persisters. An example <code>stream_writers</code>
|
|
configuration with multiple writers:</p>
|
|
<pre><code class="language-yaml">stream_writers:
|
|
events:
|
|
- event_persister1
|
|
- event_persister2
|
|
</code></pre>
|
|
<h5 id="the-typing-stream"><a class="header" href="#the-typing-stream">The <code>typing</code> stream</a></h5>
|
|
<p>The following endpoints should be routed directly to the worker configured as
|
|
the stream writer for the <code>typing</code> stream:</p>
|
|
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/typing
|
|
</code></pre>
|
|
<h5 id="the-to_device-stream"><a class="header" href="#the-to_device-stream">The <code>to_device</code> stream</a></h5>
|
|
<p>The following endpoints should be routed directly to the worker configured as
|
|
the stream writer for the <code>to_device</code> stream:</p>
|
|
<pre><code>^/_matrix/client/(r0|v3|unstable)/sendToDevice/
|
|
</code></pre>
|
|
<h5 id="the-account_data-stream"><a class="header" href="#the-account_data-stream">The <code>account_data</code> stream</a></h5>
|
|
<p>The following endpoints should be routed directly to the worker configured as
|
|
the stream writer for the <code>account_data</code> stream:</p>
|
|
<pre><code>^/_matrix/client/(r0|v3|unstable)/.*/tags
|
|
^/_matrix/client/(r0|v3|unstable)/.*/account_data
|
|
</code></pre>
|
|
<h5 id="the-receipts-stream"><a class="header" href="#the-receipts-stream">The <code>receipts</code> stream</a></h5>
|
|
<p>The following endpoints should be routed directly to the worker configured as
|
|
the stream writer for the <code>receipts</code> stream:</p>
|
|
<pre><code>^/_matrix/client/(r0|v3|unstable)/rooms/.*/receipt
|
|
^/_matrix/client/(r0|v3|unstable)/rooms/.*/read_markers
|
|
</code></pre>
|
|
<h5 id="the-presence-stream"><a class="header" href="#the-presence-stream">The <code>presence</code> stream</a></h5>
|
|
<p>The following endpoints should be routed directly to the worker configured as
|
|
the stream writer for the <code>presence</code> stream:</p>
|
|
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/presence/
|
|
</code></pre>
|
|
<h4 id="background-tasks"><a class="header" href="#background-tasks">Background tasks</a></h4>
|
|
<p>There is also support for moving background tasks to a separate
|
|
worker. Background tasks are run periodically or started via replication. Exactly
|
|
which tasks are configured to run depends on your Synapse configuration (e.g. if
|
|
stats is enabled).</p>
|
|
<p>To enable this, the worker must have a <code>worker_name</code> and can be configured to run
|
|
background tasks. For example, to move background tasks to a dedicated worker,
|
|
the shared configuration would include:</p>
|
|
<pre><code class="language-yaml">run_background_tasks_on: background_worker
|
|
</code></pre>
|
|
<p>You might also wish to investigate the <code>update_user_directory</code> and
|
|
<code>media_instance_running_background_jobs</code> settings.</p>
|
|
<p>An example for a dedicated background worker instance:</p>
|
|
<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
|
|
worker_name: background_worker
|
|
|
|
# The replication listener on the main synapse process.
|
|
worker_replication_host: 127.0.0.1
|
|
worker_replication_http_port: 9093
|
|
|
|
worker_log_config: /etc/matrix-synapse/background-worker-log.yaml
|
|
</code></pre>
|
|
<h3 id="synapseapppusher"><a class="header" href="#synapseapppusher"><code>synapse.app.pusher</code></a></h3>
|
|
<p>Handles sending push notifications to sygnal and email. Doesn't handle any
|
|
REST endpoints itself, but you should set <code>start_pushers: False</code> in the
|
|
shared configuration file to stop the main synapse sending push notifications.</p>
|
|
<p>To run multiple instances at once the <code>pusher_instances</code> option should list all
|
|
pusher instances by their worker name, e.g.:</p>
|
|
<pre><code class="language-yaml">pusher_instances:
|
|
- pusher_worker1
|
|
- pusher_worker2
|
|
</code></pre>
|
|
<h3 id="synapseappappservice"><a class="header" href="#synapseappappservice"><code>synapse.app.appservice</code></a></h3>
|
|
<p>Handles sending output traffic to Application Services. Doesn't handle any
|
|
REST endpoints itself, but you should set <code>notify_appservices: False</code> in the
|
|
shared configuration file to stop the main synapse sending appservice notifications.</p>
|
|
<p>Note this worker cannot be load-balanced: only one instance should be active.</p>
|
|
<h3 id="synapseappfederation_sender"><a class="header" href="#synapseappfederation_sender"><code>synapse.app.federation_sender</code></a></h3>
|
|
<p>Handles sending federation traffic to other servers. Doesn't handle any
|
|
REST endpoints itself, but you should set <code>send_federation: False</code> in the
|
|
shared configuration file to stop the main synapse sending this traffic.</p>
|
|
<p>If running multiple federation senders then you must list each
|
|
instance in the <code>federation_sender_instances</code> option by their <code>worker_name</code>.
|
|
All instances must be stopped and started when adding or removing instances.
|
|
For example:</p>
|
|
<pre><code class="language-yaml">federation_sender_instances:
|
|
- federation_sender1
|
|
- federation_sender2
|
|
</code></pre>
|
|
<h3 id="synapseappmedia_repository"><a class="header" href="#synapseappmedia_repository"><code>synapse.app.media_repository</code></a></h3>
|
|
<p>Handles the media repository. It can handle all endpoints starting with:</p>
|
|
<pre><code>/_matrix/media/
|
|
</code></pre>
|
|
<p>... and the following regular expressions matching media-specific administration APIs:</p>
|
|
<pre><code>^/_synapse/admin/v1/purge_media_cache$
|
|
^/_synapse/admin/v1/room/.*/media.*$
|
|
^/_synapse/admin/v1/user/.*/media.*$
|
|
^/_synapse/admin/v1/media/.*$
|
|
^/_synapse/admin/v1/quarantine_media/.*$
|
|
^/_synapse/admin/v1/users/.*/media$
|
|
</code></pre>
|
|
<p>You should also set <code>enable_media_repo: False</code> in the shared configuration
|
|
file to stop the main synapse running background jobs related to managing the
|
|
media repository. Note that doing so will prevent the main process from being
|
|
able to handle the above endpoints.</p>
|
|
<p>In the <code>media_repository</code> worker configuration file, configure the http listener to
|
|
expose the <code>media</code> resource. For example:</p>
|
|
<pre><code class="language-yaml">worker_listeners:
|
|
- type: http
|
|
port: 8085
|
|
resources:
|
|
- names:
|
|
- media
|
|
</code></pre>
|
|
<p>Note that if running multiple media repositories they must be on the same server
|
|
and you must configure a single instance to run the background tasks, e.g.:</p>
|
|
<pre><code class="language-yaml">media_instance_running_background_jobs: "media-repository-1"
|
|
</code></pre>
|
|
<p>Note that if a reverse proxy is used , then <code>/_matrix/media/</code> must be routed for both inbound client and federation requests (if they are handled separately).</p>
|
|
<h3 id="synapseappuser_dir"><a class="header" href="#synapseappuser_dir"><code>synapse.app.user_dir</code></a></h3>
|
|
<p>Handles searches in the user directory. It can handle REST endpoints matching
|
|
the following regular expressions:</p>
|
|
<pre><code>^/_matrix/client/(r0|v3|unstable)/user_directory/search$
|
|
</code></pre>
|
|
<p>When using this worker you must also set <code>update_user_directory: false</code> in the
|
|
shared configuration file to stop the main synapse running background
|
|
jobs related to updating the user directory.</p>
|
|
<p>Above endpoint is not <em>required</em> to be routed to this worker. By default,
|
|
<code>update_user_directory</code> is set to <code>true</code>, which means the main process
|
|
will handle updates. All workers configured with <code>client</code> can handle the above
|
|
endpoint as long as either this worker or the main process are configured to
|
|
handle it, and are online.</p>
|
|
<p>If <code>update_user_directory</code> is set to <code>false</code>, and this worker is not running,
|
|
the above endpoint may give outdated results.</p>
|
|
<h3 id="synapseappfrontend_proxy"><a class="header" href="#synapseappfrontend_proxy"><code>synapse.app.frontend_proxy</code></a></h3>
|
|
<p>Proxies some frequently-requested client endpoints to add caching and remove
|
|
load from the main synapse. It can handle REST endpoints matching the following
|
|
regular expressions:</p>
|
|
<pre><code>^/_matrix/client/(r0|v3|unstable)/keys/upload
|
|
</code></pre>
|
|
<p>If <code>use_presence</code> is False in the homeserver config, it can also handle REST
|
|
endpoints matching the following regular expressions:</p>
|
|
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/presence/[^/]+/status
|
|
</code></pre>
|
|
<p>This "stub" presence handler will pass through <code>GET</code> request but make the
|
|
<code>PUT</code> effectively a no-op.</p>
|
|
<p>It will proxy any requests it cannot handle to the main synapse instance. It
|
|
must therefore be configured with the location of the main instance, via
|
|
the <code>worker_main_http_uri</code> setting in the <code>frontend_proxy</code> worker configuration
|
|
file. For example:</p>
|
|
<pre><code class="language-yaml">worker_main_http_uri: http://127.0.0.1:8008
|
|
</code></pre>
|
|
<h3 id="historical-apps"><a class="header" href="#historical-apps">Historical apps</a></h3>
|
|
<p><em>Note:</em> Historically there used to be more apps, however they have been
|
|
amalgamated into a single <code>synapse.app.generic_worker</code> app. The remaining apps
|
|
are ones that do specific processing unrelated to requests, e.g. the <code>pusher</code>
|
|
that handles sending out push notifications for new events. The intention is for
|
|
all these to be folded into the <code>generic_worker</code> app and to use config to define
|
|
which processes handle the various proccessing such as push notifications.</p>
|
|
<h2 id="migration-from-old-config"><a class="header" href="#migration-from-old-config">Migration from old config</a></h2>
|
|
<p>There are two main independent changes that have been made: introducing Redis
|
|
support and merging apps into <code>synapse.app.generic_worker</code>. Both these changes
|
|
are backwards compatible and so no changes to the config are required, however
|
|
server admins are encouraged to plan to migrate to Redis as the old style direct
|
|
TCP replication config is deprecated.</p>
|
|
<p>To migrate to Redis add the <code>redis</code> config as above, and optionally remove the
|
|
TCP <code>replication</code> listener from master and <code>worker_replication_port</code> from worker
|
|
config.</p>
|
|
<p>To migrate apps to use <code>synapse.app.generic_worker</code> simply update the
|
|
<code>worker_app</code> option in the worker configs, and where worker are started (e.g.
|
|
in systemd service files, but not required for synctl).</p>
|
|
<h2 id="architectural-diagram"><a class="header" href="#architectural-diagram">Architectural diagram</a></h2>
|
|
<p>The following shows an example setup using Redis and a reverse proxy:</p>
|
|
<pre><code> Clients & Federation
|
|
|
|
|
v
|
|
+-----------+
|
|
| |
|
|
| Reverse |
|
|
| Proxy |
|
|
| |
|
|
+-----------+
|
|
| | |
|
|
| | | HTTP requests
|
|
+-------------------+ | +-----------+
|
|
| +---+ |
|
|
| | |
|
|
v v v
|
|
+--------------+ +--------------+ +--------------+ +--------------+
|
|
| Main | | Generic | | Generic | | Event |
|
|
| Process | | Worker 1 | | Worker 2 | | Persister |
|
|
+--------------+ +--------------+ +--------------+ +--------------+
|
|
^ ^ | ^ | | ^ | | ^ ^
|
|
| | | | | | | | | | |
|
|
| | | | | HTTP | | | | | |
|
|
| +----------+<--|---|---------+<--|---|---------+ | |
|
|
| | +-------------|-->+-------------+ |
|
|
| | | |
|
|
| | | |
|
|
v v v v
|
|
======================================================================
|
|
Redis pub/sub channel
|
|
</code></pre>
|
|
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