write some words about redis #7402

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1. richvdh

   added

   release blocker

   on May 4, 2020
2. babolivier

   added

   A-Docsthings relating to the documentationthings relating to the documentation

   release blocker

   and removed

   release blocker

   on May 4, 2020
3. richvdh commented on May 6, 2020

   

   richvdh

   on May 6, 2020

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   redis is an alternative to direct tcp connections to the master: rather than all the workers connecting to the master, all the workers and the master connect to redis, which relays replication commands between processes. this can give a significant cpu saving on the master and will be a prerequisite for operation gemini work.

   1. Install redis following the normal procedure for your distro - eg apt install redis-server for debian/ubuntu
   2. check it's running and accessible: you should be able to echo PING | nc -q1 localhost 6379 and get a response of +PONG.
   3. Add config to homeserver.yaml:

      redis:
        enabled: true

      Optional parameters which can go alongside enabled are host, port, password, dbid. If you don't know if you need the last two, you probably don't.
   4. That's it. Restart master and all workers.
   5. the type: replication listener documented in https://github.com/matrix-org/synapse/blob/master/docs/workers.md#configuration is now redundant. (the type: http one is still needed).

   Question: should we put this in the sample config yet?
4. richvdh

   self-assigned this

   on May 7, 2020
5. Demi-Marie commented on May 8, 2020

   

   Demi-Marie

   on May 8, 2020

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   If we support AF_UNIX connections as well as TCP connections, a performance boost can be expected.

   👍React with 👍1Reacted by Oli Oeli
6. richvdh commented on May 11, 2020

   

   richvdh

   on May 11, 2020

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   done in #7446.
7. richvdh commented on May 11, 2020

   

   richvdh

   on May 11, 2020

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   @demimarie-parity txredisapi doesn't support unix-domain sockets afaict and it's not entirely obvious to me that the performance boost would be anything other than trivial
8. richvdh

   closed this as completedon May 11, 2020
9. jkhsjdhjs commented on Dec 6, 2021

   

   jkhsjdhjs

   on Dec 6, 2021

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   @richvdh txredisapi supports unix domain socket since at least 2013: https://github.com/IlyaSkriblovsky/txredisapi#features
10. Dual-0 commented on Jun 18, 2022

    

    Dual-0

    on Jun 18, 2022

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    Is adding redis via unix socket possible in the future? Do we need a new issue/feature_request?
11. ShadowJonathan commented on Jun 18, 2022

    

    ShadowJonathan

    on Jun 18, 2022

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    I'd recommend filing a new issue for that.