Synchonizes domain lists in two pi.hole servers
- place the script into /usr/local/bin of any server, can be one of the two pi.hole servers
- change the names of the servers in the script (SERVER1 and SERVER2 variables)
- for unattended execution via cron, establish a trust relationship between server executing the script and the two pi.hole servers (or simply between the two pihole servers if the script is going to be executed by one of them). I have tested it just with root user.
At this moment, the script synchronizes the whitelisted domains from one server to the other, two ways, there is no need to have a "master" server. For each domain entry, it issues a ssh command to the server in order to find the entry in its database. If there are too many domains, it can be very quite time consuming. The script can be changed so that it copies the databases locally before executing queries (in fact that was the first implementation). I prefer the ssh implementation because it consumes less network and does not drive to a possible local file system exhaustion. If you launch the script at night, it is quick enough for its purposes.