1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
|
<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>Workers - Synapse</title>
<!-- Custom HTML head -->
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff" />
<link rel="icon" href="favicon.svg">
<link rel="shortcut icon" href="favicon.png">
<link rel="stylesheet" href="css/variables.css">
<link rel="stylesheet" href="css/general.css">
<link rel="stylesheet" href="css/chrome.css">
<link rel="stylesheet" href="css/print.css" media="print">
<!-- Fonts -->
<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
<link rel="stylesheet" href="fonts/fonts.css">
<!-- Highlight.js Stylesheets -->
<link rel="stylesheet" href="highlight.css">
<link rel="stylesheet" href="tomorrow-night.css">
<link rel="stylesheet" href="ayu-highlight.css">
<!-- Custom theme stylesheets -->
<link rel="stylesheet" href="docs/website_files/table-of-contents.css">
<link rel="stylesheet" href="docs/website_files/remove-nav-buttons.css">
<link rel="stylesheet" href="docs/website_files/indent-section-headers.css">
<link rel="stylesheet" href="docs/website_files/version-picker.css">
</head>
<body>
<!-- Provide site root to javascript -->
<script type="text/javascript">
var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
<script type="text/javascript">
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') && theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
</script>
<!-- Set the theme before any content is loaded, prevents flash -->
<script type="text/javascript">
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
<script type="text/javascript">
var html = document.querySelector('html');
var sidebar = 'hidden';
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div class="sidebar-scrollbox">
<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><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></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 class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></li><li class="chapter-item expanded "><a href="sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="jwt.html">JSON Web Tokens</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html">Registration 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="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 href="modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="modules/add_extra_fields_to_client_events_unsigned.html">Add extra fields to client events unsigned section callbacks</a></li><li class="chapter-item expanded "><a href="modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="workers.html" class="active">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item expanded "><a href="admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="admin_api/experimental_features.html">Experimental Features</a></li><li class="chapter-item expanded "><a href="admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="metrics-howto.html">Monitoring</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/monitoring/reporting_homeserver_usage_statistics.html">Reporting Homeserver Usage Statistics</a></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/monthly_active_users.html">Monthly Active Users</a></li><li class="chapter-item expanded "><a href="usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="development/reviews.html">Reviewing Code</a></li><li class="chapter-item expanded "><a href="development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><a href="development/dependencies.html">Dependency management</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="development/synapse_architecture/streams.html">Streams</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li><li class="chapter-item expanded "><a href="development/synapse_architecture/faster_joins.html">Faster remote joins</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
<div class="page">
<div id="menu-bar-hover-placeholder"></div>
<div id="menu-bar" class="menu-bar sticky bordered">
<div class="left-buttons">
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
<i class="fa fa-bars"></i>
</button>
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
<i class="fa fa-paint-brush"></i>
</button>
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
</ul>
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
<i class="fa fa-search"></i>
</button>
<div class="version-picker">
<div class="dropdown">
<div class="select">
<span></span>
<i class="fa fa-chevron-down"></i>
</div>
<input type="hidden" name="version">
<ul class="dropdown-menu">
<!-- Versions will be added dynamically in version-picker.js -->
</ul>
</div>
</div>
</div>
<h1 class="menu-title">Synapse</h1>
<div class="right-buttons">
<a href="print.html" title="Print this book" aria-label="Print this book">
<i id="print-button" class="fa fa-print"></i>
</a>
<a href="https://github.com/element-hq/synapse" title="Git repository" aria-label="Git repository">
<i id="git-repository-button" class="fa fa-github"></i>
</a>
<a href="https://github.com/element-hq/synapse/edit/develop/docs/workers.md" title="Suggest an edit" aria-label="Suggest an edit">
<i id="git-edit-button" class="fa fa-edit"></i>
</a>
</div>
</div>
<div id="search-wrapper" class="hidden">
<form id="searchbar-outer" class="searchbar-outer">
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
</form>
<div id="searchresults-outer" class="searchresults-outer hidden">
<div id="searchresults-header" class="searchresults-header"></div>
<ul id="searchresults">
</ul>
</div>
</div>
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
<script type="text/javascript">
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
</script>
<div id="content" class="content">
<main>
<!-- Page table of contents -->
<div class="sidetoc">
<nav class="pagetoc"></nav>
</div>
<h1 id="scaling-synapse-via-workers"><a class="header" href="#scaling-synapse-via-workers">Scaling synapse via workers</a></h1>
<p>For small instances it is recommended to run Synapse in the default monolith mode.
For larger instances where performance is a concern it can be helpful to split
out functionality into multiple separate python processes. These processes are
called 'workers', and are (eventually) intended to scale horizontally
independently.</p>
<p>Synapse's worker support is under active development and subject to change as
we attempt to rapidly scale ever larger Synapse instances. However we are
documenting it here to help admins needing a highly scalable Synapse instance
similar to the one running <code>matrix.org</code>.</p>
<p>All processes continue to share the same database instance, and as such,
workers only work with PostgreSQL-based Synapse deployments. SQLite should only
be used for demo purposes and any admin considering workers should already be
running PostgreSQL.</p>
<p>See also <a href="https://matrix.org/blog/2020/11/03/how-we-fixed-synapses-scalability">Matrix.org blog post</a>
for a higher level overview.</p>
<h2 id="main-processworker-communication"><a class="header" href="#main-processworker-communication">Main process/worker communication</a></h2>
<p>The processes communicate with each other via a Synapse-specific protocol called
'replication' (analogous to MySQL- or Postgres-style database replication) which
feeds streams of newly written data between processes so they can be kept in
sync with the database state.</p>
<p>When configured to do so, Synapse uses a
<a href="https://redis.io/docs/manual/pubsub/">Redis pub/sub channel</a> to send the replication
stream between all configured Synapse processes. Additionally, processes may
make HTTP requests to each other, primarily for operations which need to wait
for a reply ─ such as sending an event.</p>
<p>All the workers and the main process connect to Redis, which relays replication
commands between processes.</p>
<p>If Redis support is enabled Synapse will use it as a shared cache, as well as a
pub/sub mechanism.</p>
<p>See the <a href="#architectural-diagram">Architectural diagram</a> section at the end for
a visualisation of what this looks like.</p>
<h2 id="setting-up-workers"><a class="header" href="#setting-up-workers">Setting up workers</a></h2>
<p>A Redis server is required to manage the communication between the processes.
The Redis server should be installed following the normal procedure for your
distribution (e.g. <code>apt install redis-server</code> on Debian). It is safe to use an
existing Redis deployment if you have one.</p>
<p>Once installed, check that Redis is running and accessible from the host running
Synapse, for example by executing <code>echo PING | nc -q1 localhost 6379</code> and seeing
a response of <code>+PONG</code>.</p>
<p>The appropriate dependencies must also be installed for Synapse. If using a
virtualenv, these can be installed with:</p>
<pre><code class="language-sh">pip install "matrix-synapse[redis]"
</code></pre>
<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
<code>packages.matrix.org</code> and in the docker images at
https://hub.docker.com/r/ectorim/synapse/.</p>
<p>To make effective use of the workers, you will need to configure an HTTP
reverse-proxy such as nginx or haproxy, which will direct incoming requests to
the correct worker, or to the main synapse instance. See
<a href="reverse_proxy.html">the reverse proxy documentation</a> for information on setting up a reverse
proxy.</p>
<p>When using workers, each worker process has its own configuration file which
contains settings specific to that worker, such as the HTTP listener that it
provides (if any), logging configuration, etc.</p>
<p>Normally, the worker processes are configured to read from a shared
configuration file as well as the worker-specific configuration files. This
makes it easier to keep common configuration settings synchronised across all
the processes.</p>
<p>The main process is somewhat special in this respect: it does not normally
need its own configuration file and can take all of its configuration from the
shared configuration file.</p>
<h3 id="shared-configuration"><a class="header" href="#shared-configuration">Shared configuration</a></h3>
<p>Normally, only a few changes are needed to make an existing configuration
file suitable for use with workers:</p>
<ul>
<li>First, you need to enable an
<a href="usage/configuration/config_documentation.html#listeners">"HTTP replication listener"</a>
for the main process</li>
<li>Secondly, you need to enable
<a href="usage/configuration/config_documentation.html#redis">redis-based replication</a></li>
<li>You will need to add an <a href="usage/configuration/config_documentation.html#instance_map"><code>instance_map</code></a>
with the <code>main</code> process defined, as well as the relevant connection information from
it's HTTP <code>replication</code> listener (defined in step 1 above).
<ul>
<li>Note that the <code>host</code> defined is the address the worker needs to look for the <code>main</code>
process at, not necessarily the same address that is bound to.</li>
<li>If you are using Unix sockets for the <code>replication</code> resource, make sure to
use a <code>path</code> to the socket file instead of a <code>port</code>.</li>
</ul>
</li>
<li>Optionally, a <a href="usage/configuration/config_documentation.html#worker_replication_secret">shared secret</a>
can be used to authenticate HTTP traffic between workers. For example:</li>
</ul>
<pre><code class="language-yaml"># extend the existing `listeners` section. This defines the ports that the
# main process will listen on.
listeners:
# The HTTP replication port
- 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
instance_map:
main:
host: 'localhost'
port: 9093
</code></pre>
<p>See the <a href="usage/configuration/config_documentation.html">configuration manual</a>
for the full documentation of each option.</p>
<p>Under <strong>no circumstances</strong> should the replication listener be exposed to the
public internet; replication traffic is:</p>
<ul>
<li>always unencrypted</li>
<li>unauthenticated, unless <a href="usage/configuration/config_documentation.html#worker_replication_secret"><code>worker_replication_secret</code></a>
is configured</li>
</ul>
<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:</p>
<ul>
<li>The type of worker (<a href="usage/configuration/config_documentation.html#worker_app"><code>worker_app</code></a>).
The currently available worker applications are listed <a href="#available-worker-applications">below</a>.</li>
<li>A unique name for the worker (<a href="usage/configuration/config_documentation.html#worker_name"><code>worker_name</code></a>).</li>
<li>If handling HTTP requests, a <a href="usage/configuration/config_documentation.html#worker_listeners"><code>worker_listeners</code></a> option
with an <code>http</code> listener.</li>
<li><strong>Synapse 1.72 and older:</strong> if handling the <code>^/_matrix/client/v3/keys/upload</code> endpoint, the HTTP URI for
the main process (<code>worker_main_http_uri</code>). This config option is no longer required and is ignored when running Synapse 1.73 and newer.</li>
</ul>
<p>For example:</p>
<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
worker_name: generic_worker1
worker_listeners:
- type: http
port: 8083
x_forwarded: true
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="start-synapse-with-poetry"><a class="header" href="#start-synapse-with-poetry">Start Synapse with Poetry</a></h2>
<p>The following applies to Synapse installations that have been installed from source using <code>poetry</code>.</p>
<p>You can start the main Synapse process with Poetry by running the following command:</p>
<pre><code class="language-console">poetry run synapse_homeserver --config-file [your homeserver.yaml]
</code></pre>
<p>For worker setups, you can run the following command</p>
<pre><code class="language-console">poetry run synapse_worker --config-file [your homeserver.yaml] --config-file [your worker.yaml]
</code></pre>
<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/make_knock/
^/_matrix/federation/v1/send_knock/
^/_matrix/federation/(v1|v2)/invite/
^/_matrix/federation/v1/event_auth/
^/_matrix/federation/v1/timestamp_to_event/
^/_matrix/federation/v1/exchange_third_party_invite/
^/_matrix/federation/v1/user/devices/
^/_matrix/key/v2/query
^/_matrix/federation/v1/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/rooms/.*/hierarchy$
^/_matrix/client/(v1|unstable)/rooms/.*/relations/
^/_matrix/client/v1/rooms/.*/threads$
^/_matrix/client/unstable/im.nheko.summary/summary/.*$
^/_matrix/client/(r0|v3|unstable)/account/3pid$
^/_matrix/client/(r0|v3|unstable)/account/whoami$
^/_matrix/client/(r0|v3|unstable)/devices$
^/_matrix/client/versions$
^/_matrix/client/(api/v1|r0|v3|unstable)/voip/turnServer$
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/event/
^/_matrix/client/(api/v1|r0|v3|unstable)/joined_rooms$
^/_matrix/client/v1/rooms/.*/timestamp_to_event$
^/_matrix/client/(api/v1|r0|v3|unstable/.*)/rooms/.*/aliases
^/_matrix/client/(api/v1|r0|v3|unstable)/search$
^/_matrix/client/(r0|v3|unstable)/user/.*/filter(/|$)
^/_matrix/client/(api/v1|r0|v3|unstable)/directory/room/.*$
^/_matrix/client/(r0|v3|unstable)/capabilities$
^/_matrix/client/(r0|v3|unstable)/notifications$
# 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/
^/_matrix/client/(r0|v3|unstable)/keys/upload/
# Registration/login requests
^/_matrix/client/(api/v1|r0|v3|unstable)/login$
^/_matrix/client/(r0|v3|unstable)/register$
^/_matrix/client/(r0|v3|unstable)/register/available$
^/_matrix/client/v1/register/m.login.registration_token/validity$
^/_matrix/client/(r0|v3|unstable)/password_policy$
# 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)/knock/
^/_matrix/client/(api/v1|r0|v3|unstable)/profile/
# 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/
# User directory search requests
^/_matrix/client/(r0|v3|unstable)/user_directory/search$
</code></pre>
<p>Additionally, the following REST endpoints can be handled for GET requests:</p>
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/pushrules/
</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 <a href="usage/configuration/config_documentation.html#listeners">HTTP listener</a>
with <code>client</code> and <code>federation</code> <code>resources</code> must be configured in the
<a href="usage/configuration/config_documentation.html#worker_listeners"><code>worker_listeners</code></a>
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. This can
be done in reverse proxy by extracting username part from the users access token.</p>
<p>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>Example <code>nginx</code> configuration snippet that handles the cases above. This is just an
example and probably requires some changes according to your particular setup:</p>
<pre><code class="language-nginx"># Choose sync worker based on the existence of "since" query parameter
map $arg_since $sync {
default synapse_sync;
'' synapse_initial_sync;
}
# Extract username from access token passed as URL parameter
map $arg_access_token $accesstoken_from_urlparam {
# Defaults to just passing back the whole accesstoken
default $arg_access_token;
# Try to extract username part from accesstoken URL parameter
"~syt_(?<username>.*?)_.*" $username;
}
# Extract username from access token passed as authorization header
map $http_authorization $mxid_localpart {
# Defaults to just passing back the whole accesstoken
default $http_authorization;
# Try to extract username part from accesstoken header
"~Bearer syt_(?<username>.*?)_.*" $username;
# if no authorization-header exist, try mapper for URL parameter "access_token"
"" $accesstoken_from_urlparam;
}
upstream synapse_initial_sync {
# Use the username mapper result for hash key
hash $mxid_localpart consistent;
server 127.0.0.1:8016;
server 127.0.0.1:8036;
}
upstream synapse_sync {
# Use the username mapper result for hash key
hash $mxid_localpart consistent;
server 127.0.0.1:8013;
server 127.0.0.1:8037;
server 127.0.0.1:8038;
server 127.0.0.1:8039;
}
# Sync initial/normal
location ~ ^/_matrix/client/(r0|v3)/sync$ {
proxy_pass http://$sync;
}
# Normal sync
location ~ ^/_matrix/client/(api/v1|r0|v3)/events$ {
proxy_pass http://synapse_sync;
}
# Initial_sync
location ~ ^/_matrix/client/(api/v1|r0|v3)/initialSync$ {
proxy_pass http://synapse_initial_sync;
}
location ~ ^/_matrix/client/(api/v1|r0|v3)/rooms/[^/]+/initialSync$ {
proxy_pass http://synapse_initial_sync;
}
</code></pre>
<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.</p>
<p>To enable this, the worker must have:</p>
<ul>
<li>An <a href="usage/configuration/config_documentation.html#listeners">HTTP <code>replication</code> listener</a> configured,</li>
<li>Have a <a href="usage/configuration/config_documentation.html#worker_name"><code>worker_name</code></a>
and be listed in the <a href="usage/configuration/config_documentation.html#instance_map"><code>instance_map</code></a>
config.</li>
<li>Have the main process declared on the <a href="usage/configuration/config_documentation.html#instance_map"><code>instance_map</code></a> as well.</li>
</ul>
<p>Note: 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:
main:
host: localhost
port: 8030
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
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
# x_forwarded: true
# 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 writer workers, where load
is sharded between them by room ID. Each writer is called an <em>event persister</em>. They are
responsible for</p>
<ul>
<li>receiving new events,</li>
<li>linking them to those already in the room <a href="development/room-dag-concepts.html">DAG</a>,</li>
<li>persisting them to the DB, and finally</li>
<li>updating the events stream.</li>
</ul>
<p>Because load is sharded in this way, you <em>must</em> restart all worker instances when
adding or removing event persisters.</p>
<p>An <code>event_persister</code> should not be mistaken for an <code>event_creator</code>.
An <code>event_creator</code> listens for requests from clients to create new events and does
so. It will then pass those events over HTTP replication to any configured event
persisters (or the main process if none are configured).</p>
<p>Note that <code>event_creator</code>s and <code>event_persister</code>s are implemented using the same
<a href="#synapseappgeneric_worker"><code>synapse.app.generic_worker</code></a>.</p>
<p>An example <a href="usage/configuration/config_documentation.html#stream_writers"><code>stream_writers</code></a>
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>
<h5 id="the-push_rules-stream"><a class="header" href="#the-push_rules-stream">The <code>push_rules</code> stream</a></h5>
<p>The following endpoints should be routed directly to the worker configured as
the stream writer for the <code>push_rules</code> stream:</p>
<pre><code>^/_matrix/client/(api/v1|r0|v3|unstable)/pushrules/
</code></pre>
<h4 id="restrict-outbound-federation-traffic-to-a-specific-set-of-workers"><a class="header" href="#restrict-outbound-federation-traffic-to-a-specific-set-of-workers">Restrict outbound federation traffic to a specific set of workers</a></h4>
<p>The
<a href="usage/configuration/config_documentation.html#outbound_federation_restricted_to"><code>outbound_federation_restricted_to</code></a>
configuration is useful to make sure outbound federation traffic only goes through a
specified subset of workers. This allows you to set more strict access controls (like a
firewall) for all workers and only allow the <code>federation_sender</code>'s to contact the
outside world.</p>
<pre><code class="language-yaml">instance_map:
main:
host: localhost
port: 8030
federation_sender1:
host: localhost
port: 8034
outbound_federation_restricted_to:
- federation_sender1
worker_replication_secret: "secret_secret"
</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). This worker doesn't handle any REST endpoints itself.</p>
<p>To enable this, the worker must have a unique
<a href="usage/configuration/config_documentation.html#worker_name"><code>worker_name</code></a>
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
<a href="#updating-the-user-directory"><code>update_user_directory_from_worker</code></a> and
<a href="#synapseappmedia_repository"><code>media_instance_running_background_jobs</code></a> 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
worker_log_config: /etc/matrix-synapse/background-worker-log.yaml
</code></pre>
<h4 id="updating-the-user-directory"><a class="header" href="#updating-the-user-directory">Updating the User Directory</a></h4>
<p>You can designate one generic worker to update the user directory.</p>
<p>Specify its name in the <a href="usage/configuration/config_documentation.html#update_user_directory_from_worker">shared configuration</a>
as follows:</p>
<pre><code class="language-yaml">update_user_directory_from_worker: worker_name
</code></pre>
<p>This work cannot be load-balanced; please ensure the main process is restarted
after setting this option in the shared configuration!</p>
<p>User directory updates allow REST endpoints matching the following regular
expressions to work:</p>
<pre><code>^/_matrix/client/(r0|v3|unstable)/user_directory/search$
</code></pre>
<p>The above endpoints can be routed to any worker, though you may choose to route
it to the chosen user directory worker.</p>
<p>This style of configuration supersedes the legacy <code>synapse.app.user_dir</code>
worker application type.</p>
<h4 id="notifying-application-services"><a class="header" href="#notifying-application-services">Notifying Application Services</a></h4>
<p>You can designate one generic worker to send output traffic to Application Services.
Doesn't handle any REST endpoints itself, but you should specify its name in the
<a href="usage/configuration/config_documentation.html#notify_appservices_from_worker">shared configuration</a>
as follows:</p>
<pre><code class="language-yaml">notify_appservices_from_worker: worker_name
</code></pre>
<p>This work cannot be load-balanced; please ensure the main process is restarted
after setting this option in the shared configuration!</p>
<p>This style of configuration supersedes the legacy <code>synapse.app.appservice</code>
worker application type.</p>
<h4 id="push-notifications"><a class="header" href="#push-notifications">Push Notifications</a></h4>
<p>You can designate generic workers to send push notifications to
a <a href="https://spec.matrix.org/v1.5/push-gateway-api/">push gateway</a> such as
<a href="https://github.com/matrix-org/sygnal">sygnal</a> and email.</p>
<p>This will stop the main process sending push notifications.</p>
<p>The workers responsible for sending push notifications can be defined using the
<a href="usage/configuration/config_documentation.html#pusher_instances"><code>pusher_instances</code></a>
option. For example:</p>
<pre><code class="language-yaml">pusher_instances:
- pusher_worker1
- pusher_worker2
</code></pre>
<p>Multiple workers can be added to this map, in which case the work is balanced
across them. Ensure the main process and all pusher workers are restarted after changing
this option.</p>
<p>These workers don't need to accept incoming HTTP requests to send push notifications,
so no additional reverse proxy configuration is required for pusher workers.</p>
<p>This style of configuration supersedes the legacy <code>synapse.app.pusher</code>
worker application type.</p>
<h3 id="synapseapppusher"><a class="header" href="#synapseapppusher"><code>synapse.app.pusher</code></a></h3>
<p>It is likely this option will be deprecated in the future and is not recommended for new
installations. Instead, <a href="#push-notifications">use <code>synapse.app.generic_worker</code> with the <code>pusher_instances</code></a>.</p>
<p>Handles sending push notifications to sygnal and email. Doesn't handle any
REST endpoints itself, but you should set
<a href="usage/configuration/config_documentation.html#start_pushers"><code>start_pushers: false</code></a> in the
shared configuration file to stop the main synapse sending push notifications.</p>
<p>To run multiple instances at once the
<a href="usage/configuration/config_documentation.html#pusher_instances"><code>pusher_instances</code></a>
option should list all pusher instances by their
<a href="usage/configuration/config_documentation.html#worker_name"><code>worker_name</code></a>, e.g.:</p>
<pre><code class="language-yaml">start_pushers: false
pusher_instances:
- pusher_worker1
- pusher_worker2
</code></pre>
<p>An example for a pusher instance:</p>
<pre><code class="language-yaml">worker_app: synapse.app.pusher
worker_name: pusher_worker1
worker_log_config: /etc/matrix-synapse/pusher-worker-log.yaml
</code></pre>
<h3 id="synapseappappservice"><a class="header" href="#synapseappappservice"><code>synapse.app.appservice</code></a></h3>
<p><strong>Deprecated as of Synapse v1.59.</strong> <a href="#notifying-application-services">Use <code>synapse.app.generic_worker</code> with the
<code>notify_appservices_from_worker</code> option instead.</a></p>
<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>It is likely this option will be deprecated in the future and not recommended for
new installations. Instead, <a href="usage/configuration/config_documentation.html#federation_sender_instances">use <code>synapse.app.generic_worker</code> with the <code>federation_sender_instances</code></a>.</p>
<p>Handles sending federation traffic to other servers. Doesn't handle any
REST endpoints itself, but you should set
<a href="usage/configuration/config_documentation.html#send_federation"><code>send_federation: false</code></a>
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
<a href="usage/configuration/config_documentation.html#federation_sender_instances"><code>federation_sender_instances</code></a>
option by their
<a href="usage/configuration/config_documentation.html#worker_name"><code>worker_name</code></a>.
All instances must be stopped and started when adding or removing instances.
For example:</p>
<pre><code class="language-yaml">send_federation: false
federation_sender_instances:
- federation_sender1
- federation_sender2
</code></pre>
<p>An example for a federation sender instance:</p>
<pre><code class="language-yaml">worker_app: synapse.app.federation_sender
worker_name: federation_sender1
worker_log_config: /etc/matrix-synapse/federation-sender-log.yaml
</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/
/_matrix/client/v1/media/
/_matrix/federation/v1/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
<a href="usage/configuration/config_documentation.html#enable_media_repo"><code>enable_media_repo: False</code></a>
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
<a href="usage/configuration/config_documentation.html#listeners">HTTP listener</a> to
expose the <code>media</code> resource. For example:</p>
<pre><code class="language-yaml">worker_app: synapse.app.media_repository
worker_name: media_worker
worker_listeners:
- type: http
port: 8085
x_forwarded: true
resources:
- names: [media]
worker_log_config: /etc/matrix-synapse/media-worker-log.yaml
</code></pre>
<p>Note that if running multiple media repositories they must be on the same server
and you must specify a single instance to run the background tasks in the
<a href="usage/configuration/config_documentation.html#media_instance_running_background_jobs">shared configuration</a>,
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><strong>Deprecated as of Synapse v1.59.</strong> <a href="#updating-the-user-directory">Use <code>synapse.app.generic_worker</code> with the
<code>update_user_directory_from_worker</code> option instead.</a></p>
<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="historical-apps"><a class="header" href="#historical-apps">Historical apps</a></h3>
<p>The following used to be separate worker application types, but are now
equivalent to <code>synapse.app.generic_worker</code>:</p>
<ul>
<li><code>synapse.app.client_reader</code></li>
<li><code>synapse.app.event_creator</code></li>
<li><code>synapse.app.federation_reader</code></li>
<li><code>synapse.app.federation_sender</code></li>
<li><code>synapse.app.frontend_proxy</code></li>
<li><code>synapse.app.pusher</code></li>
<li><code>synapse.app.synchrotron</code></li>
</ul>
<h2 id="migration-from-old-config"><a class="header" href="#migration-from-old-config">Migration from old config</a></h2>
<p>A main change that has occurred is the merging of worker apps into
<code>synapse.app.generic_worker</code>. This change is backwards compatible and so no
changes to the config are required.</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>
</main>
<nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons -->
<a rel="prev" href="modules/porting_legacy_module.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="synctl_workers.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
<div style="clear: both"></div>
</nav>
</div>
</div>
<nav class="nav-wide-wrapper" aria-label="Page navigation">
<a rel="prev" href="modules/porting_legacy_module.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="synctl_workers.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
</nav>
</div>
<script type="text/javascript">
window.playground_copyable = true;
</script>
<script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
<script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
<script src="searcher.js" type="text/javascript" charset="utf-8"></script>
<script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
<script src="highlight.js" type="text/javascript" charset="utf-8"></script>
<script src="book.js" type="text/javascript" charset="utf-8"></script>
<!-- Custom JS scripts -->
<script type="text/javascript" src="docs/website_files/table-of-contents.js"></script>
<script type="text/javascript" src="docs/website_files/version-picker.js"></script>
<script type="text/javascript" src="docs/website_files/version.js"></script>
</body>
</html>
|
