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+## About Jitsi
+
+Several server components:
+  - prosody XMPP (ext)
+  - jitsi videobridge aka JVB
+  - jitsi conference focus aka jicofo aka focus
+  - jitsi meet
+  - octo
+  - jigasi
+  - jibri
+  - etc.
+
+Some libs:
+  - libjitsi
+  - jicoco
+  - jitsi-utils
+  - etc.
+
+Client components:
+  - jitsi meet electron
+  - jitsi android/ios
+  - etc.
+
+## Conf
+
+Base conf:
+
+  - [videobridge.conf](https://github.com/jitsi/jitsi-videobridge/blob/master/jvb/src/main/resources/reference.conf)
+  - [jicofo.conf](https://github.com/jitsi/jicofo/blob/master/src/main/resources/reference.conf)
+
+the following is used in videobridge.conf:
+[jicoco/MucClientConfiguration](https://github.com/jitsi/jicoco/blob/master/jicoco/src/main/java/org/jitsi/xmpp/mucclient/MucClientConfiguration.java)
+
+How the new configuration is read in jicoco:
+https://github.com/jitsi/jicoco/blob/master/jicoco-config/src/main/kotlin/org/jitsi/config/JitsiConfig.kt#L83-L91
+They use this library: https://github.com/lightbend/config
+We are particularly interested by: https://github.com/lightbend/config#standard-behavior
+Using 'application.conf' with classpath does not seem to work.
+But, specifying the file path as `-Dconfig.file=/etc/jitsi/jicofo.conf` works!
+
+Some parameters are also set independently of lightbend hocon config.
+They are seen in jicofo entrypoint:
+https://github.com/jitsi/jicofo/blob/master/src/main/java/org/jitsi/jicofo/Main.java
+Many of these parameters can be in fact read from the HOCON file except one: the `--secret` parameter or the `JICOFO_SECRET` env variable.
+But we can see this is a deprecated thing, it has been already removed from master: https://github.com/jitsi/jicofo/commit/c9e5b50a8b4e77f8b8cb8831a4a044a53edfcf48
+For now (as per v5390) we will keep `JICOFO_SECRET` environment variable but will assume no other environment variable is set
+But maybe this value is deprecated: the check is still here but it is not used anymore?!
+
+## Generate certs with prosody
+```
+prosodyctl cert generate auth.jitsi
+prosodyctl cert generate jitsi
+```
+
+## An example prosody configuration file
+
+https://github.com/jitsi/jitsi-meet/blob/master/doc/example-config-files/prosody.cfg.lua.example
+
+but this one is not the one used by the [debian postinst script](https://github.com/jitsi/jitsi-meet/blob/master/debian/jitsi-meet-prosody.postinst)
+instead, we should look at this one: https://github.com/jitsi/jitsi-meet/blob/master/doc/debian/jitsi-meet-prosody/prosody.cfg.lua-jvb.example
+
+Jitsi can be configured to authenticated through tokens,
+the postinst file is here: https://github.com/jitsi/jitsi-meet/blob/master/debian/jitsi-meet-tokens.postinst
+
+## Resources to understand jitsi
+
+  - [jicofo/debian/postinst](https://github.com/jitsi/jicofo/blob/master/debian/postinst)
+  - [videobridge/debian/postinst](https://github.com/jitsi/jitsi-videobridge/blob/master/debian/postinst)