{ pkgs, ... }: { services.postgresql = { enable = true; enableTCPIP = true; settings.listen_addresses = pkgs.lib.mkForce "127.0.0.1,172.17.0.1"; }; networking.firewall.extraCommands = "iptables -A INPUT -p tcp --destination-port 5432 -s 172.16.0.0/12 -j ACCEPT"; }