1. Installer Docker
2. Créer un fichier docker compose:

   nano docker-compose.yml

   avec le contenu:

   docker-compose.yml

   ---
   version: "3.4"
   
   services:
     gravity:
       # Important for this to be static and unique
       hostname: gravity1
       image: ghcr.io/beryju/gravity:stable
       restart: unless-stopped
       network_mode: host
       volumes:
         - data:/data
       # environment:
       #   LOG_LEVEL: info
       # The default log level of info logs DHCP and DNS queries, so ensure
       # the logs aren't filling up the disk
       logging:
         driver: json-file
         options:
           max-size: "10m"
           max-file: "3"
   
   volumes:
     data:
       driver: local

Rajouter dans les DHCP Options la partie domain_name:

- tagName: router
  value: 10.31.7.1
- tagName: domain_name
  value: tpanalytics.lan