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82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
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---
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title: Troubleshooting
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parent: Administration
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permalink: /administration/troubleshooting
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---
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# Troubleshooting
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If your Dendrite installation is acting strangely, there are a few things you should
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check before seeking help.
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## 1. Logs
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Dendrite, by default, will log all warnings and errors to stdout, in addition to any
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other locations configured in the `dendrite.yaml` configuration file. Often there will
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be clues in the logs.
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You can increase this log level to the more verbose `debug` level if necessary by adding
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this to the config and restarting Dendrite:
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```
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logging:
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- type: std
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level: debug
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```
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Look specifically for lines that contain `level=error` or `level=warning`.
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## 2. Federation tester
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If you are experiencing problems federating with other homeservers, you should check
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that the [Federation Tester](https://federationtester.matrix.org) is passing for your
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server.
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Common reasons that it may not pass include:
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1. Incorrect DNS configuration;
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2. Misconfigured DNS SRV entries or well-known files;
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3. Invalid TLS/SSL certificates;
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4. Reverse proxy configuration issues (if applicable).
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Correct any errors if shown and re-run the federation tester to check the results.
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## 3. System time
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Matrix relies heavily on TLS which requires the system time to be correct. If the clock
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drifts then you may find that federation no works reliably (or at all) and clients may
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struggle to connect to your Dendrite server.
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Ensure that your system time is correct and consider syncing to a reliable NTP source.
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## 4. Database connections
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If you are using the PostgreSQL database, you should ensure that Dendrite's configured
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number of database connections does not exceed the maximum allowed by PostgreSQL.
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Open your `postgresql.conf` configuration file and check the value of `max_connections`
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(which is typically `100` by default). Then open your `dendrite.yaml` configuration file
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and ensure that:
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1. If you are using the `global.database` section, that `max_open_conns` does not exceed
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that number;
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2. If you are **not** using the `global.database` section, that the sum total of all
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`max_open_conns` across all `database` blocks does not exceed that number.
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## 5. File descriptors
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Dendrite requires a sufficient number of file descriptors for every connection it makes
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to a remote server, every connection to the database engine and every file it is reading
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or writing to at a given time (media, logs etc). We recommend ensuring that the limit is
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no lower than 65535 for Dendrite.
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Dendrite will check at startup if there are a sufficient number of available descriptors.
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If there aren't, you will see a log lines like this:
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```
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level=warning msg="IMPORTANT: Process file descriptor limit is currently 65535, it is recommended to raise the limit for Dendrite to at least 65535 to avoid issues"
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```
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Follow the [Optimisation](../installation/10_optimisation.md) instructions to correct the
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available number of file descriptors.
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