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fc670f03a2
* Update sample configs * Update references * Remove sections that are dead in the monolith sample
130 lines
5.6 KiB
Markdown
130 lines
5.6 KiB
Markdown
---
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title: FAQ
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nav_order: 1
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permalink: /faq
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---
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# FAQ
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## Is Dendrite stable?
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Mostly, although there are still bugs and missing features. If you are a confident power user and you are happy to spend some time debugging things when they go wrong, then please try out Dendrite. If you are a community, organisation or business that demands stability and uptime, then Dendrite is not for you yet - please install Synapse instead.
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## Is Dendrite feature-complete?
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No, although a good portion of the Matrix specification has been implemented. Mostly missing are client features - see the readme at the root of the repository for more information.
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## Is there a migration path from Synapse to Dendrite?
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No, not at present. There will be in the future when Dendrite reaches version 1.0. For now it is not
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possible to migrate an existing Synapse deployment to Dendrite.
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## Can I use Dendrite with an existing Synapse database?
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No, Dendrite has a very different database schema to Synapse and the two are not interchangeable.
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## Should I run a monolith or a polylith deployment?
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Monolith deployments are always preferred where possible, and at this time, are far better tested than polylith deployments are. The only reason to consider a polylith deployment is if you wish to run different Dendrite components on separate physical machines, but this is an advanced configuration which we don't
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recommend.
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## I've installed Dendrite but federation isn't working
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Check the [Federation Tester](https://federationtester.matrix.org). You need at least:
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* A valid DNS name
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* A valid TLS certificate for that DNS name
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* Either DNS SRV records or well-known files
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## Does Dendrite work with my favourite client?
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It should do, although we are aware of some minor issues:
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* **Element Android**: registration does not work, but logging in with an existing account does
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* **Hydrogen**: occasionally sync can fail due to gaps in the `since` parameter, but clearing the cache fixes this
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## Does Dendrite support push notifications?
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Yes, we have experimental support for push notifications. Configure them in the usual way in your Matrix client.
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## Does Dendrite support application services/bridges?
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Possibly - Dendrite does have some application service support but it is not well tested. Please let us know by raising a GitHub issue if you try it and run into problems.
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Bridges known to work (as of v0.5.1):
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* [Telegram](https://docs.mau.fi/bridges/python/telegram/index.html)
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* [WhatsApp](https://docs.mau.fi/bridges/go/whatsapp/index.html)
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* [Signal](https://docs.mau.fi/bridges/python/signal/index.html)
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* [probably all other mautrix bridges](https://docs.mau.fi/bridges/)
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Remember to add the config file(s) to the `app_service_api` section of the config file.
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## Is it possible to prevent communication with the outside world?
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Yes, you can do this by disabling federation - set `disable_federation` to `true` in the `global` section of the Dendrite configuration file.
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## Should I use PostgreSQL or SQLite for my databases?
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Please use PostgreSQL wherever possible, especially if you are planning to run a homeserver that caters to more than a couple of users.
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## Dendrite is using a lot of CPU
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Generally speaking, you should expect to see some CPU spikes, particularly if you are joining or participating in large rooms. However, constant/sustained high CPU usage is not expected - if you are experiencing that, please join `#dendrite-dev:matrix.org` and let us know what you were doing when the
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CPU usage shot up, or file a GitHub issue. If you can take a [CPU profile](PROFILING.md) then that would
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be a huge help too, as that will help us to understand where the CPU time is going.
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## Dendrite is using a lot of RAM
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As above with CPU usage, some memory spikes are expected if Dendrite is doing particularly heavy work
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at a given instant. However, if it is using more RAM than you expect for a long time, that's probably
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not expected. Join `#dendrite-dev:matrix.org` and let us know what you were doing when the memory usage
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ballooned, or file a GitHub issue if you can. If you can take a [memory profile](PROFILING.md) then that
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would be a huge help too, as that will help us to understand where the memory usage is happening.
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## Dendrite is running out of PostgreSQL database connections
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You may need to revisit the connection limit of your PostgreSQL server and/or make changes to the `max_connections` lines in your Dendrite configuration. Be aware that each Dendrite component opens its own database connections and has its own connection limit, even in monolith mode!
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## What is being reported when enabling anonymous stats?
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If anonymous stats reporting is enabled, the following data is send to the defined endpoint.
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```json
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{
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"cpu_average": 0,
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"daily_active_users": 97,
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"daily_e2ee_messages": 0,
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"daily_messages": 0,
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"daily_sent_e2ee_messages": 0,
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"daily_sent_messages": 0,
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"daily_user_type_bridged": 2,
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"daily_user_type_native": 97,
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"database_engine": "Postgres",
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"database_server_version": "11.14 (Debian 11.14-0+deb10u1)",
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"federation_disabled": false,
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"go_arch": "amd64",
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"go_os": "linux",
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"go_version": "go1.16.13",
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"homeserver": "localhost:8800",
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"log_level": "trace",
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"memory_rss": 93452,
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"monolith": true,
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"monthly_active_users": 97,
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"nats_embedded": true,
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"nats_in_memory": true,
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"num_cpu": 8,
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"num_go_routine": 203,
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"r30v2_users_all": 0,
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"r30v2_users_android": 0,
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"r30v2_users_electron": 0,
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"r30v2_users_ios": 0,
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"r30v2_users_web": 0,
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"timestamp": 1651741851,
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"total_nonbridged_users": 97,
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"total_room_count": 0,
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"total_users": 99,
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"uptime_seconds": 30,
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"version": "0.8.2"
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}
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```
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