Installation of a container “Ubuntu 22” on the Proxmox. I set 2 Cores and 4GB RAM.
The next step (not mandatory) is to activate SSH on the container (more comfortable than using the Console of the Proxmox). ⇒ you know what to do….

# apt-get install nginx 

No config needed.

Following this tuto: https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-quickstart

• The hostname “jitsi” is given by the container name set in Proxmox. ⇒ check etc/hosts but don't modify!

• # apt install software-properties-common
  # apt-add-repository universe
  # apt update
  
  # curl -sL https://prosody.im/files/prosody-debian-packages.key -o /etc/apt/keyrings/prosody-debian-packages.key
  # echo "deb [signed-by=/etc/apt/keyrings/prosody-debian-packages.key] http://packages.prosody.im/debian $(lsb_release -sc) main" | tee /etc/apt/sources.list.d/prosody-debian-packages.list
  # apt install lua5.2
  
  # curl -sL https://download.jitsi.org/jitsi-key.gpg.key | sh -c 'gpg --dearmor > /usr/share/keyrings/jitsi-keyring.gpg'
  # echo "deb [signed-by=/usr/share/keyrings/jitsi-keyring.gpg] https://download.jitsi.org stable/" | tee /etc/apt/sources.list.d/jitsi-stable.list
  
  # apt-get update
    
  # apt install jitsi-meet 

During the installation let Jitsi generate a self signed cert.
Reboot and “https://jitsi.mydomain.tld” should now display the welcome screen.

The following extra lines need to be added to the file /etc/jitsi/videobridge/sip-communicator.properties with the internal and external IPs:

org.ice4j.ice.harvest.NAT_HARVESTER_LOCAL_ADDRESS=<Local.IP.Address>   | at the beginning of the file
# org.ice4j.ice.harvest.STUN_MAPPING_HARVESTER_ADDRESSES     | add # to comment this line

org.ice4j.ice.harvest.NAT_HARVESTER_PUBLIC_ADDRESS=<Public.IP.Address>       | at the end of the file 

Target: the current external IP must be present into the conf file in order that Jitsi runs correctly.
Following steps are therefore necessary by using a dynamic IP:

• a script in order to compare the current external IP with the IP present into the conf file and to replace it if it has changed since last IP-check
• run the script at bootup
• run the script regularly

(this script comes from an internet forum… and is modified!)

 # nano  /etc/init.d/script_IP.sh 

#!/bin/sh
 
### BEGIN INIT INFO
# Provides:          Nom du script
# Required-Start:    $local_fs $network
# Required-Stop:     $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Description courte
# Description:       Description longue
### END INIT INFO


DNSNAME="jitsi.domain.tld"                           ##### adjust according your settings

# get the actual IP from the Internet
IPint=$(curl ifcfg.me)

# get the configured IP of Jitsi
IPjitsi=$(grep 'NAT_HARVESTER_PUBLIC_ADDRESS' /etc/jitsi/videobridge/sip-communicator.properties |  grep -oE "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+")

if [ "$IPjitsi" = "$IPint" ]
then
        echo "IP has not been changed!"
        exit 0
fi

#clear config
sed -i '/NAT_HARVESTER_PUBLIC_ADDRESS/d' /etc/jitsi/videobridge/sip-communicator.properties

#get IP and renew line
echo org.ice4j.ice.harvest.NAT_HARVESTER_PUBLIC_ADDRESS=$IPint >> /etc/jitsi/videobridge/sip-communicator.properties

#restart services
systemctl restart jicofo
systemctl restart prosody
systemctl restart jitsi-videobridge2 

 # chmod +x /etc/init.d/script_IP.sh 

Source: https://www.jbnet.fr/systeme/linux/debian-executer-un-script-au-demarrage-de-la-machine.html

# cd /etc/init.d 
# update-rc.d script_IP.sh defaults 

# nano /etc/cron.d/IP_jitsi 

0 */1 * * * root /etc/init.d/script_IP.sh 

• into /etc/prosody/conf.avail/jitsi.domain.tld.cfg.lua

  VirtualHost "jitsi.domain.tld"
  authentication = "internal_hashed"     | instad of jitsi-anonymous
  
  ... and add another virtualhost after it:
  
  VirtualHost "guest.jitsi.domain.tld"
      authentication = "anonymous"
      c2s_require_encryption = false

• into /etc/jitsi/jicofo/jicofo.conf add at the beginng:

  jicofo {
    authentication: {
      enabled: true
      type: XMPP
      login-url: jitsi.domain.tld
    } 

• create the authenticated user

  # prosodyctl register the_user jitsi.domain.tls the_password_of_the_user 

or follow this tuto: https://crosstalksolutions.com/how-to-enable-jitsi-server-authentication/