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useradd -d /data/daemons/synapse -m synapse mkdir /data/synapse chown synapse:synapse /data/synapse su - synapse mkdir /deposito/synapse/data mkdir /deposito/synapse/database

docker-composer.yml

podman compose pull
podman compose run --rm -e SYNAPSE_SERVER_NAME=chat.mydomain.com -e SYNAPSE_REPORT_STATS=yes synapse generate

Edit your /deposito/synapse/data/homeserver.yaml

docker-compose.yml

version: '3'
services:
  synapse:
    image: docker.io/matrixdotorg/synapse:latest
    restart: unless-stopped
    environment:
      - SYNAPSE_CONFIG_PATH=/data/homeserver.yaml
    volumes:
      - /data/synapse/data:/data
    depends_on:
      - db
    ports:
      - 8008:8008/tcp
    networks:
      - synapse-net

  db:
    image: docker.io/postgres:12-alpine
    environment:
      - POSTGRES_USER=synapse
      - POSTGRES_PASSWORD=< my password >
      - POSTGRES_INITDB_ARGS=--encoding=UTF-8 --lc-collate=C --lc-ctype=C
    volumes:
      - /data/synapse/database:/var/lib/postgresql/data
    networks:
      - synapse-net

networks:
  synapse-net: {}

podman compose run --entrypoint /usr/local/bin/register_new_matrix_user https://chat.mydomain.com  -c /data/homeserver.yaml synapse